Sony TV does not turn on bravia reasons
Diagrams and service instructions for disassembly for Sony TVs
TV SONY KV-M2530. The TV receives and stores any programs on the first channel only. When switching channels, TV pauses for a second on the selected channel, and then returns back to the first channel. Tuner here with frequency synthesizer, SDA20560 tuning processor, SDA2546 memory. All with IC bus control. Unfortunately, the LED on the front panel in this TV model has not yet been taught to blink, so I had to figure it out without a hint. The memory chip (SDA2546) turned out to be faulty
TV SONY KV-21X5D. Imported from Germany. It turned out to have a super-sophisticated sound channel. The TDA9817 microcircuit (radio channel) has a non-standard switching circuit. PChZ output. 12 leg. Further in the gap, it hits the cool TDA9870A sound processor (it has more legs than the video and control processor). After installing the 6.5 X 5.5 converter into the track gap after the 12th leg, the TDA9817 works fine. The difficulty is that the usual filter that highlights the second gap
Sony 2540 after several years of operation (usually 2 years). The external manifestation of the defect is varied: with warming up, loss of gain, color, image, picture twitching, dark raster, gray field, spontaneous transition to Stand by mode. The reason was the channel selector. Structurally, the SCV is made in such a way that its internal screen partitions are simultaneously current-carrying circuit elements, supplying ground to some points of the printed circuit board. Over time, the places of the rations of these sealed partitions will collapse and periodic non-contact occurs. It is possible to visually identify the defect using a magnifying glass. Considering that the external manifestation of the defect completely confuses the table, with the complex circuitry of the apparatus, as well as the high cost of parts, and the fact that these models are not worth repairing in stacks, it turned out to be not easy to identify the disease
SONY 29E1, S2951: white horizontal mowing lines 2-3 cm wide running at intervals of 5-6 cm from top to bottom along the right edge of the screen. over, the defect is observed only in the 100 Hz mode; when switching to the 50 Hz mode, the effect disappears. The picture becomes OK. I have had three cases in 2 years. I never figured out the first one (I left the battlefield with nothing). And on the second one I already understood what was the matter. The memory chip CXK48324R, position number IC04, on the digital video signal processing board is out of order
Sony TV (M1 for example) released last 2-3 years. After a certain operating time, for no reason, the screen fills with one of the primary colors, after which the current protection is triggered and the TV goes into standby mode. The crux of the matter: at the vaunted Trinitron CRT, the filament sags over time and shortens to one of the modulators. (This happens only in a hot state) The way out is very simple. to tear the filament off the ground. The performance is fully restored, the picture quality is almost always satisfactory.
SONY 25KV40. If after turning on STAN BY the LED starts blinking repeatedly, you need to turn off the power by simultaneously pressing. programm. After that, turn on the TV according to the service documentation
SONY TV works, but after a while it turns off and turns on immediately. When analyzing the malfunction, we find that the line pulse from the processor disappears. But do not rush to change the processor, it has nothing to do with it. Quartz needs to be changed. This defect occurs in models: KV-2192 M3 / RM687 B KV-2565 MTJ / RM-827 S and the like with the CXA1213 processor. Quartz 500 KHz
SONY KV1420K (Monoblock) Periodically spontaneously switches the 6.5 MHz sound system to the 5.5 MHz system. The defect is very common. The fault is located in module 1-693-232-11, ENH-19708. Non-propane contours and quartz. The defect is found only in devices assembled in Malaysia. Someone else will argue that the yellow assembly is no different from the white one. I advise you to solder everything in this module
SONY 2540KV. After soldering the tuner, the LED on the front panel stopped showing the tuner malfunction. However, there was no image on all channels, the frame was shifted, which, when displaying the channel number, led to the output of only tens, there was sound, the TV went to the menu normally. On the recommendation of a friend, I rewrote the non-volatile memory according to the following algorithm: 1) switch to channel 59 in operating mode; 2) switch TV to standby mode; 3) disconnect the TV from the network, wait until the LED goes out and then plug into the outlet again; 4) sequentially and at a pace, press the remote control buttons?, 5, vol, on TV (square). this is to go to the service mode; 5) sequentially press buttons 4, 1, 1, 5; 6) switch TV to standby mode; 7) turn off TV with the button on the front panel
When repairing the tuner, in addition to soldering the choke, I recommend soldering the quartz resonator and the legs of the tuner itself (inside it). The same applies to Sony 2509, 2171 and others where a tuner made in Spain is installed.
Sony 25M1. External manifestations of malfunction TDKS 859898800: increased dimensions in H and V, fractures along the edge of pAstra
Sony 2981. After soldering the tuner, about a month later, a malfunction occurred, the external manifestation of which is as follows: there is no image in the right half of the screen, at some moments the width of the image on the left side of the screen decreases to 10-15 cm. The raster is normal, there are no distortions in the visible part of the image. I suspected a malfunction on board A, but it worked fine on another TV. By the way, it can be checked on models 2540 and 25M1 without any changes in board A, only it is better to turn down the volume to zero in advance. The malfunction turned out to be in the HFBP signal (OX pulses from the horizontal scan) passing through the H Dumper D800 D801 circuit to ensure the steepness of the pulse edges. The D800 does not switch well, resulting in a flatter edge. In other Sony TVs with a diagonal of 25, 29, the scheme for obtaining HFBP is the same, but they did not have a similar malfunction
SONY M2155 Fault: already the 4th TV this year. There is no color in the PAL system (SECAM is running normally) Reason: non-drip of variable capacitance and quartz (capacitance change, otherwise there will be repetitions) through the PAL system near the video processor
S0NY KV-C2961K. Does not turn on. Replace the 220mkF50V capacitor in the power supply unit
Classic case with TV SONY KV-X2961 It does not turn on, the LEDs on the front panel flash: A-1 times, then B-13 times and everything repeats. I did not find a service instruction for it anywhere (on the network, too). In most of your service links, 13 blinks are a frame failure, and so it turned out. the infamous ring cracks around the legs of the personnel IMS (almost invisible to the naked eye). Turned on after soldering, the following defect creeps out: the OSD and teletext are completely out of sync horizontally, vertically compressed by about a quarter, the main image and OSD are completely normal, well, I think they came: ((I take off the board V, on it under the screen of the SIEMENS microcircuit. and so on and a familiar detail immediately catches the eye.variable capacitor, in appearance the same as the one that causes troubles in other SONY models. with chromaticity in the PAL system. teletext readable.It’s even a shame, a famous company, amazing build and soldering quality, and such trifles are even worse than domestic ones: ((
If in a SONY 2540 TV and the like, after soldering the tuner, the LED continues to flash 13 times, you must replace the TDA5512 microcircuit (it costs about 1.5)
A complete method for setting up Sony TVs, from mixing to the service menu SONY KV-M2540 When turned on from the attendant, it reacts to the remote control or buttons on the panel only until the image appears, after which nothing is controlled and the service information freezes (channel number or the scale of any adjustments if the adjustments were pressed before the image appeared), the image and sound are normal. I thought that the percent (TDA8366) of management, but someone in the conference (praise him) said that the resistor assemblies (4 rezyukas each) were moping around the core, but the defect manifested itself differently. I measured these assemblies without soldering, it turned out that in one short man between the cuts, and in the second deviation from the nominal value, he dropped them and again measured everything is normal, despite the fact that the places where the assemblies stood for resistance are not measured! I soldered them back (just in case, turning them over) and everything worked
SONY KV-2153MT. When the TV is turned on, a weak squeak is heard from the power supply. Secondary short-circuit protection has tripped. The avalanche diode D657 R2K is out of order. The reason for the failure of the diode is the overestimated output voltage from the power supply. In the power supply, the capacity of C611.47mk 50 volts has dried up. Drying is facilitated by the resistance of R608 7W, which is installed in close proximity to the electrolyte. I advise you to change the capacity of C613 10mk 100 volts, as well as solder the resistances R812 R812 R619 R808 R806 R609 R520
Sony KV-25K1R, KV-29K1R, widescreen and many other models! I want to share how to open the system menu of TVs: Take a remote control like Sony RM-862 and open it. In the upper part of the remote control, near the switch, there is a place for jumpers, to the left, under the switch there is a jumper. touch the wire to this jumper and the MENU button 1 time. The TV will enter a temporary test mode. In the upper right corner of the screen T If you press 2 times continuous test mode. In the upper right corner of the screen TT 2. Press the MENU button 2 times. Before you the service menu of the TV!
Sony KV-25t1r TV. When turned on, it tries to turn on, then the diode blinks 6 times. A close inspection of the board revealed an ic 500 (STV 9379 vertical scan). After eliminating the defect, everything works. Soldering breakdowns are the result of an unsuccessful way of fixing the board. The board, containing massive elements, having a format of approximately 2/3, is fixed to the line on both smaller sides. But also getinax. A couple of years of operation and vibration from the speakers provides us with work
On the SONY TV KV-2553MT two defects at once: a) Strong nonlinearity in frames: replace C558 560 x 25. b) The quality of the image (kinks) and sound (wheezing) periodically deteriorates until they disappear completely (there is only snow on the screen): solder the contour in the IF201 submodule (radio channel )
Sony kv-2182m9. the raster is compressed from the sides by 5-10 cm and slightly stretched vertically. TDKS whistles with a death whistle. The supply voltage for horizontal scanning immediately after switching on 115v, but after 1-2 minutes it decreases to 80-85v. Defect: capacitor C614, through which the pulses arr. strokes are fed to the power supply from page sweep
TVs Sony KV-14T1R. Stood on duty during a thunderstorm. As a result. There is an OSD, and the picture barely leaks out (as if there is no brightness). At pin FC (21) (control of the RGB switch) MC44002P raised 0 and low amplitude of pulses (lines. It is very similar to a malfunction of the voltage multiplier on domestic TV. It turned out to be bad soldering of the case terminal of the line transformer
SONY KV-G21T1. The screen is illuminated in blue with reverse lines and then the protection is triggered. The power supply unit goes into standby mode. The voltage on the blue video amplifier in standby mode is 114 V, at the moment the kinescope is opened, the voltage drops to zero and the protection is triggered. At the moment of warming up, the filament sags and closes to the body. The case was cut off at the glow and laid with a separate wire (and not wound with an additional winding) from the 6th leg of the TDKS
SONY KV-M1400K. Does not turn on. The integral fuse N15 for the line scan power supply burned out, apparently due to a short-term overload. The rest is all right
SONY (personnel TDA8170) malfunction. there is a narrow horizontal bar on the screen. The TV came with a changed microcircuit. Measurements showed that the supply voltages and input signals of the microcircuit are normal, so we had to check the remaining electrolytes. And indeed the reason turned out to be in one of them. the volume through which signals to change the horizontal size go (checked by replacement)
SONY-M2100K. Does not turn on. All voltages from the power supply are underestimated. On the 140V circuit, only 15V. In the primary circuit, all parts are intact, including STR54041. The diode D604 turned out to be faulty. Named as serviceable
SONY KV-21LT1B, chassis FE-2. The TV does not switch from standby to working mode, the LED blinks with a cycle of 11 flashes. pause. According to the table of error codes. there is no 8V voltage. This voltage is formed by an integral stabilizer BA41W12ST-V5. We turn off the load circuits, at pin 1 of the microcircuit the voltage is 11 volts instead of eight. We change the protective zener diodes. D615, D012, D005 type MTZJ-8,8B. Instead of the BA41W12ST-V5 stabilizer (cost 10-18), I installed a KIA7808 stabilizer on the radiator.
Sony KV-21T1R. The option to select BG / DK has disappeared from the menu, and BG (5.5 MHz) has become the current one. It did not use the service. Swapped sound filters
Sony KV-C2171. Distortion of pAstra and the absence of a luminance signal in the image. I am to blame for everything, the flashed firmware of the memory chip
SONY KV-14M1K. When turned on, the LED blinks 6 times. On the 52 leg of the processor, a high level. the protection for the power supply of the sweeps is activated. Breakage of the resistor, power supply of the frame scan 24V with TDKS. The TDA9302 frame scan chip is broken. Replaced with a new one, the TV turned on
SONY KV.M25. etc., when switched on from the ST-BY standby mode, the LED goes out for a short time, and then lights up constantly and no diagnostics. The problem turned out to be in the diode D314 for the power supply of the TDA8366 microcircuit. Before the diode 9 volts, after 5.5
SONY G14M1 First time came after a thunderstorm two years ago, changed STR, line transistor, SE115, 4558 in personnel
SONY KV-M2530K, SONY KV-M2531K, SONY KV-X2151 \ RM816 chassis AE-1C. Doesn’t switch channels. Only channel 00 works. The SDA2546 memory chip is out of order, you can put any 24C04
Sony 14 ‘KV-1484. After 10-20 minutes of work, the control disappears. I tried to replace the 10 MHz quartz with 4.43 MHz, the processor does not heat up and the TV worked for several hours without comment. In order for the remote control to work, you also need to change the resonator 960 to 425-455 in it. (there was no council at that time)
SONY KV-25X5R chassis FE-1. After 3.5 years of flawless operation of the TV, the Q533 2SD2539 transistor in horizontal scanning failed. Detected non-slip capacitor C543 (470pF 2Kv)
Sony KV-25R1A / D / E / K / R. The power supply does not start. The output voltage slowly rises from zero to 24V. (norm-135v). The TV came in not repaired after replacing STRS6707. Instead of R = 0.33ohm (measuring!) Set from 6 (STRS6707) to the ground, a PEL wound with a wire was stuck (not equivalent of course). Replaced with R = 0.33th and it all worked
Sony KV-M1400K. After a while, the sound disappears, and the noise remains. Solder quartz in the radio channel
Sony video dual. Radio channel on М51496Р. The sound disappears, it makes noise. Solder quartz next to the microcircuit
Sony 14 ‘KV-1484. After 10-20 minutes of work, the control disappears. I tried to replace the 10 MHz quartz with 4.43 MHz, the processor does not heat up and the TV worked for several hours without comment. In order for the remote control to work, you also need to change the resonator 960 to 425-455 in it. (there was no council at that time)
Sony KV-21FT1K (chassis FE-2) 11 flashes of the LED do not turn on, on the advice of 1021 we look at the BA41W12ST stabilizer, if you tear off the first leg (output 8V), when you turn on 9.3V on it, put the stabilizer 7808 at 8 volts, change the indicated zener diodes. Further, when 5 flashes are turned on, according to the table this is an IKR malfunction, transistors Q713, Q703 (BF420) and a diode D708 (replaced by 1N4148) are punctured on the kinescope board, it is also worth looking at similar transistors in the green and blue circuits
SONY 21FT1K does not turn on, does not respond to the remote control, dezh. there is. Worked for only a month since the end of the warranty. Replaced planar memory 24С08W6. The power supply of this memory is 3 volts. I installed a clean one and not a planar one, everything works. The adjustment service did not have to be done
TV SONY KV-X2961 When switching from channel to channel, the required channel is not always stable, that is, the required number appears in the OSD for a short time, but with the appearance of the picture it switches back. When you press the button on the remote again, everything happens correctly. From the front panel, the control works in the same way for this defect. Sometimes, according to the owners, he starts to switch himself, for example, from 6 to 7 and back, until you stop it with the remote control. I need a memory chip. Pre-read the old firmware with the programmer and uploaded it to the new memory 24c16
SONY 2540. The graphics are there, the cathodes are locked at 200V on each. Cause. open circuit resistor R318 1KOM on the submodule. Through it, from the CRT board, ABB measuring pulses are fed to the 30th leg of the TDA8366
SONY KV-AR14. There is no our D / K sound standard (imported from overseas). There is no line in the menu at all with switching the sound standard. Everything is treated from the service. You need to enter the service mode (i, 5, vol, power), find the OPT B 003 line and make it like this. OPT B 003 OPB3 008 servis 50, then find the line SDEM 002 and change it like this. SDEM 002 BPB 000 servis 50. After that, our sound will appear and the D / K or M line will appear in the menu (in the user menu)
SONY KV-21DK1 chassis SCC-F21S Received with a punctured output line transistor, the owner said that before the refusal, the image shrunk horizontally and began to double, after restoring the line, it turned out that way, the output stage warmed up wildly for several seconds. there is an increase in the horizontal scanning frequency, but the frequency meter showed the norm, but the shape of the pulses was distorted. the through-line capacitor C513 is to blame. Loss of capacitance, stands next to powerful resistors, and therefore it gets very hot
SONY KV-2167 MT repaired 2 times with an interval of six months. 1. There is a raster with noises without an image and sound, does not respond to buttons and the remote control, FB251 is cut off. 15 V fuse with power supply. The ULF VA5412 microcircuit turned out to be faulty, power supply broken. 2.When turned on, there is a burst of high, then does not come out of standby mode. The voltage from the power supply unit is normal, there are no short circuits in the secondary circuits., The line transistor and memory are in good order. C562 100×16 swam in the Q561 transistor circuit, and it was checked as working with the C-meter, after replacement everything works
SONY KV-M1400K Does not turn on. The LED on the front panel does not show signs of life, all the voltages of the power supply are 10 times too low. Diode D604. defective (RGP15J replaced by FR155) is called as a working digital tester in diode continuity mode, but in resistance measurement mode it shows 5.7kΩ in both directions. After replacing, check the R606 68Ω resistor on the first leg of STR54041, it was in an open circuit (do not turn on the TV before that.Otherwise, if the resistor is open (or the feedback does not work for another reason), then all voltages will be overestimated 3 times, i.e. instead of 120 volts, 380 will go to the circuit. instead of 20 volts, 60 volts will go, and the ULF TDA7245 will die first, since the voltage of 60 volts (instead of 20) goes to it without stabilization), check the serviceability of the fuse N15 (0.6A) and the limiting zener diode R2M on the power supply of the horizontal scan (B 120 Volts), the horizontal transistor BU508A, ULF TDA7245 (the burned-out microcircuit gives 12 Ohm at the power input, for the power supply unit it is a short circuit). After all the ordeals, the TV will probably work
I can’t turn on my Sony TV
Sony KV-L34MF1 The microcircuit flies from the power supply unit STRS6708 They brought the TV dug and with the exploded STRS6708 The tracks were peeled off from the board, apparently changed many times. Searching for nothing found many problems with these STRs but nobody solved this problem or wrote the end result. First of all, I changed the STR-ku. related parts and capacitors. When turned on after 2-3 seconds, the STR got very hot. It attracted attention that at the input of the diode bridge
220V and at the output of 600V it seems to be impossible? But miracles don’t happen right! So in this case, immediately change STR81145, which works in parallel with the power supply unit on the STRS6708, the second terminal mass of the STR-ke was open-circuit and it turned out a voltage multiplier by two, that’s all.!
SONY KV-2540 Ch B3-E there is no picture, sometimes it appears without synchronization and poor quality. There is sound, but it stutters. In AV mode, it works without problems. The CHIP Conder C155 buffer stage (issue Q132) on board A is defective. Decreased to hundreds of pF. Unfortunately, the nominal value is not indicated on the diagram and replaced it with a 0.047μF condender. Works without comment. The failure of the CHIP of the conductors is an ordinary case, but my tip will help anyone save time
SONY KV-21M3K TV works for 1-2 minutes and turns off in standby mode. In this case, the LED blinks 6 times. Soldering the video processor solved all the problems
SONY KV-21C4R There is a black vertical stripe in the center of the screen. Approximately 10 cm. OSD (graphics) twitches. Fault C810 0.001, R012 47Kom
SONY KV-2220ES. BP in defense. Broken C818 (20 μF 250 V). Costs in the scanner
SONI KV-M2100K no correction replace C806.47nk C808. PM105J D802. D28-06
S0NY G21M1 LED is blinking or STRS6707 is broken. replace C623 220.0x16V
SONY KV-14M1. The TV works for 15-20 minutes normally. Then, when switching programs, the TV. the LED is on (pseudo STN-BY) and does not respond to any commands, including STN-BY. You can turn it off only with the power button. If you immediately turn on the power button, then the TV, bypassing the standby mode, immediately turns on the program (sometimes at 00), which can work for a long time if you do not switch programs and do not use the settings. The suspicion was for a 12 MHz quartz processor (quartz was replaced). The cause of the malfunction was the 24CO2 memory chip. After replacement, you have to reprogram all channels again.
SONY KV-25X1R After switching on, a high appears, for a split second. trapezoidal image on and off. Defective vertical scan microcircuit STV9379. Plants. 15 volts
S0NY KV-C2511D AE-1A no start (on the front panel the diode blinks continuously), according to the owner, the TV started after a few minutes, with each subsequent day the turn-on time increased. When switching off the TV, a high voltage sound is heard (TV tries to start). After checking the voltage of the power supply unit (secondary circuit), on the Q603 2SB1185 transistor (the emitter has a change, there is no filtering) replace C615 1000.0 / 35v.
S0NY KV-C2569D AE-1 No start (pulsating three attempts) and blocking. Check by replacing C605 220 / 35v (power supply 12v, 15-pin TEA2260)
S0NY KV-C2951 TV operates in AV mode. there is no picture from the tuner. Graphics are normal, there is no snow during channel settings. The transistor in the submodule of the Q7 radio channel is faulty (FQ was replaced with 3J). SMD SI-P
Sony KV-M2101D having made a visual inspection, on the main board (OS connector) on the bottom side there is a charred block and a diode contact D806 (RGP02-17 has a high resistance of about 2-8kOhm. Norm). We eliminate burning, turn on TV. there is no start, the diode blinks 2 times. check the fuse supplying B to the TDKS (visually similar to a transistor, in the TRAF area)
SONY KV-S2911D TV turns on, works fine, but after shutdown there is no start, but only pulsating start attempts (with a high one) or with an understated power supply of 180-200v the same picture. The power supply unit is assembled on 4605-3 (4605 can be installed). check R611 100 Ohm. (from 10-pins TPI to D602)
SONY KV-X2941 AE-1C no start, the mode diode does not light up, applying 12v to the PC C714 TV starts, check 15.5 on the Q609 collector. breakage R618 or track from D623
Monoblock SONY KV-14V1K Turns on, can receive a cassette, but return it only manually. At first glance, the defect is simple, the output voltages are lowered to 10V after replacing almost the entire STR 6708 strapping and replacing the SE115. the defect remains! After several more days of searching, I found a planar transistor Q606. leak K-E. After replacing his candy bar came to life
Sony KV-2182M9 there is a narrow strip on the screen, about 10 cm.The reason is in the C558 capacitor (470 microfarads at 25 V.), dried up to 250 microfarads
SONY KV-X2901K. Malfunction. chaotic loss of reception on the I-th band (1-5 meter channels), we have an ORT program on the first button. It is clear that the matter is in the UV-916H tuner. I remove, solder almost the entire board. shielding partitions, coils, microcircuits, conclusions. A month later, a repeat with the same malfunction. Additional feature. when you move the plug in the antenna socket, reception appears, it is clear that somewhere the contact is missing. Again I had to unsolder the tuner and connect it with a loop. He took off the shielding covers and began to gently deform the tuner’s body, and the reception appeared. Using the insulated stick method, I found a missing contact between the case and the printed circuit board (this place is located in the upper part of the board near the back wall, almost opposite the antenna socket). I could not detect this defect visually. Conclusion: in order not to suffer, you need to immediately solder these damned tuners from SONEK completely, since their service life has expired, and people do not want to buy new TVs, and it seems to me that the new ones are worse than the old ones, you can cite as an example the TVs that were brought from. abroad and bought in. they work for 15-20 years
SONY KV-2000E. Fault: does not turn on. Failed BU208 in the power supply. Reason: the line terristor marked SG-613 is broken. There are no analogues.You can try to restore a faulty terristor: for this we cut off its upper part by 1-2 mm on emery until there is free access to the crystal. We check the presence of contact from the leads to the crystal and restore it using conductive glue. Seals the hole with an aluminum plate using glue. We change the BU208, install the repaired SG-613 terristor and turn on the TV
SONY KV-X2571R Fault: Correction of pAstra (concavity on the sides) is violated, but some strange, not symmetrical and the vertical size is violated and the raster is shifted up. After a long research of the scanner, I realized that everything was in order there. The thought was suggested by the fact that all these distortions also change with new switching on. Sometimes the channel setting is lost when switching from channel to channel. I began to search in the memory area, and it immediately turned out that the SCL synchro bus goes 5v and only 3v on the SDA data bus. The shape of the impulses is normal. The voltage sat down on a protective zener diode. Replaced it all worked. This breakdown is surprising in its symptoms.
SONY KV-A2521K. When turned on, it seems to turn on, but there is no pAstra and sound. The indicator blinks at intervals of about 20-25 seconds once. Sometimes when turned on for 1 sec. high voltage appears and then silence. When checking, it was found that the power supply of the horizontal scan at some point is 135 volts, then it becomes equal to 150 volts. At the same time, there are no pulses of starting a horizontal scan from the 10th leg of the TEA2028B to the base of the 2SC2688 swing transistor. Also, the voltage of 12 volts is underestimated somewhere down to 10.5 volts. When the oscilloscope checked the pulses on the remaining pins of the TEA2028B microcircuit, everything seemed to be normal, but only on the 12th leg the pulses changed their shape. This H PLS pulse comes from the TEA2028B to the board where the pAstra correction circuit is located on the TEA2031A microcircuit. It also contains 2 SCART connectors, and cascades on TDA6200 microcircuits; CXA1114P etc. So on this board there is a diode, indicated in the diagram as D1504. This very diode stands in the circuit where the H PLS pulse passes. He then leaked. The reverse junction resistance is about 60Kom. The diode itself is turned on by the cathode to 12 volts. It turns out that through this leak, a voltage of 12 volts was mixed into the H PLS pulse and the processor worked out the error. After replacing the diode, the line scan started and the TV came to life
SONY KV-2584MT, 8-10 years old, GP-1A chassis. It turns on normally, works for up to a minute, or a little longer, then goes into standby mode. It turned out that the protection circuit, assembled on two transistors Q312, Q313, is triggered, which fix a drop of 130v on a powerful resistor R340 1.2om connected in series in a 130v circuit. The resistor burned out over the years and began to show about 6-8 ohms, this was enough, to fix false overload
SONY KV-G21M1, when the power button is turned on, the power pulsates as if overloaded, it is on STRS6707, change 470.0x16v in the STR strap, at the same time 470x25v in the same place
SONY KV-21VM3MT Shassis BC-2. (video dual) Fault: there is no sound in the TV and VCR. The ULF works, the adjustment indication on the screen is from 0 to 100. The firmware of the 24C08 memory chip has flown. Change memory on the programmer
SONY KV-M1400K. Fault: when you turn it on, you can hear the start of the power supply, but the indicator of neither standby nor operating mode does not light up, the lowercase does not start at all. I started by measuring secondary supply voltages. Oddly enough, all tensions were normal. I looked at the processor, on the 41st leg. high level and does not change, when turned on, to low. Replaced the PCA84C840P / 012A processor. I turn it on, the standby indicator turned on, as expected, red. I give it from the remote control to turn it on, goes into operating mode (the LED lights up green), but the result is the same, the lowercase does not start. After checking all the lines for starting the line scan, I did not find a specific defect. Then I decided to check the output circuit of the 12V stabilizer for a short one. The resistance of the output circuit of the stabilizer was 25 ohms. I began to sequentially unsolder the outputs of the microcircuits powered by this stabilizer. The faulty ones turned out to be: TDA7245 (full short 3 legs, it was already soldered by craftsmen) and TDA3508 (resistance between the 6th and 24th legs of the 25th). I replaced the TDA7245, but the TDA3508 was not at hand, I put the TDA3505 instead. I turn it on, no result. Then I change the TDA8304, turn it on, the lowercase has started, service information is displayed, but there is no image and sound. When applied to the LF input, the image and sound are normal, but silence from the tuner. God knows how long it took, I found an SMD transistor DTC124EK (the inscription on it is 25) on the Q020 circuit. This transistor switches the TV to TV / AV mode on command from the processor. He then was in the leak on (collector-emitter). When dialing the tester, be careful. it is with resistors inside. In my case, the transistor rang on K-E, like a conventional base-collector. After replacing it, the long-awaited image appeared, but at the moment of switching on, a bluish raster with lines of the reverse motion appears for a few seconds, and the image is normal, but without color. Maybe the mowing line for a few seconds is due to the fact that instead of the TDA3508, I put the TDA3505. I dig further and one more microcircuit is faulty. TDA4650. I replace, the color appears. But here again the gimp. no sound. Rather, there is, but very weak with hiss, and even then, if the volume is turned on to maximum. Generally a circus. Almost everything does not work. I checked the sound channel and found two dead microcircuits. TDA3827 and CX20061. I change it, turn it on, and the sound is normal. The only thing left is the illumination of the pAstra with a bluish background with OX lines at the moment of switching on, literally by 5 seconds. But the owner did not even look at it. I tried to regulate the accelerating one, changed the conductors for the power supply of the video amplifier circuits and no changes, I am inclined to believe that the parameters of the TDA3508 and 05 are still different
SONY-KV-M2530k, Fault: there is no frame scan, the TDA8170 is out of order, but when replacing it, I recommend changing immediately its environment in the form of capacitors: C532 100.0x63v, C531 680.0x25v, C522 100.0x63v, because they are are almost always dry by this time
SONY KV2184MT Fault: went out when turned on from the duty room. The fuse is intact. The internal power transistor of the PWM STR50115B is open, R2M on B is broken. Everything has been replaced. TV started up, B is normal, there is a horizontal bar on the screen. In the break R853 (0.47E) on the E power supply of the KR. Replaced. TV turns on for 1 sec. and is cut down. Broken ms. KR hPC1488H. Replaced with LA7830 and it worked
SONY KV-G21M2. The raster is narrowed horizontally, there is no sound. The malfunctions, as it turned out, are related. The 115V capacitor was blown up, and the MC of the TA8248K sound was terribly warm. After a double replacement, the TV worked fine. According to the owner, there was very little tension on the previous night, the lights were barely glowing, and the TV was in the duty room. Apparently the power supply could not stand the bullying. Power is supplied to the MS of sound and in the duty room. Just in case, I changed the PC123 optocoupler. He’s not expensive
SONY KV-29LS60K, chassis AE6B. Fault: when turned on, the LED on the front panel flashes. two flashes each (means overcurrent) if you press the power buttons on the remote control. and off. the TV starts blinking in series of three flashes (means overvoltage). When a light bulb was connected instead of a 135V load, it flashed for a moment, then went out. With the connection of the load, the light stopped even briefly lighting up. After a thorough check of the elements on the line scan board, an element P5NA40 was found (reference designation like Q8806). After replacing it with the P6NA60, the TV’s performance was restored. I also noticed that if you turn off the SCREEN control on the TDKS completely, the LED on the front panel starts blinking five times, but the image and sound remain. An unpackaged diode was also found, one end of which was not soldered, but contact with the board was due to the fact that it was tightly glued to the board. It was located on the power supply board, the STB6V signal went through it to the relay. Here is a white assembly for you, over time this malfunction, I think, would also come out
Sony M2155, and others like them. No color in PAL. The defect has been described many times. solutions are different. But the simplest thing. put instead of variable capacitance (about quartz 8.86 PAL) constant 18 pF and that’s it. This has been practiced for a very long time.
SONY KV-2100 or similar. When enabled, the raster is illuminated gradually to the maximum. There are no pictures, the channel number is barely visible, the sound is normal, there are no reverse lines of the CD. Replacing the TDA3508 does not help. Three-level strobe of normal amplitude. The capacitor of the capacitive divider SIOX is faulty (the OX pulse is removed from it to form the strobe), connected to the collector of the line transistor. As a result of the deterioration of the Q-factor of the capacitor, the amplitude of the pulse applied to the formation of the three-level strobe decreases, which leads to a decrease in the duration of the middle SSB area and the failure of the ABB circuit
Sony KV-25R1A / D / E / K / R Fault: the cut in the image increases with increasing brightness, it looks like a dead TDKS. It turned out that the poor soldering of the box terminal of the line transformer, although it did take place, had nothing to do with it. Replacement TDKS 859898800
SONY KV2964MT. When turned on, it beeps. Overload 130V. For a long time I could not find what was the matter. It turned out to be a dead R2 (I don’t remember with which letter). That’s what I was looking for. It stands not, as usual, near the power supply transformer, but somewhere in the middle of the entire board, and the board is very large and dirty (the TV is 15 years old). The root cause. capacitors C613 10mkFx100V and C11-47mkFx50 V in the strapping of the STR S5941 BP microcircuit. They were at zero
Sony G21M2. Does not turn on. Broken line transistor D1878. The reason seems to be obvious. cold soldering TMS. Soldered, the transistor was replaced with an identical one. I turn it on. The raster on the right does not fully open, the transistor heats up quickly. Once again I checked everything that is possible and what is not. Lost a lot of time. Then I decided to change the line transistor again. This time I installed D2333 and it worked. D1878 turned out to be defective, although it called out great and even launched a lowercase scan
Chinese TV Sony (chassis. 3Y01) composition: LC863332B (5Z51 3M05) LA76810A LA7642 (Seсam) CS5265 (ULF) 24С16. Fault: when the Auto search option is selected in the menu, the channels are rebuilt, but they are not recorded in the memory. Immediately replaced the memory. Result 0. Confused by one more thing. after 5 minutes of operation, the processor froze (the screen darkened, control disappeared). The next step (which, in science, should have been the first, of course). checking processor power (and memory). Result. 9.5V (although no overheating of the IC cases was observed). Cause. stabilizer 7805 (item N553). After its replacement, the voltage returned to normal (5 V) and the channels were recorded in memory. Yes EPROMku had to leave a new one (the native still could not stand the double power supply. It was read, but did not write new data), but the processor. turned out to be more alive
SONY KV-G21M2 Extinguished The fuse is intact, R611 (0.1E) is open. Replaced. PSU on STR-S6708. Replaced. Also replaced by C623.624 at 470 uF. TV started working
SONY KV-25M1K After 5 minutes, all adjustments stop working, the channel does not switch. May not turn on, LED does not blink. Quartz replacement 3579545
SONY KV-2185MT no horizontal scan start, starts on 5 attempts, the output transistor heats up, replace C513 1.0x50V
Sony KV-21M3K (chassis BE-4A). Almost complete repetition of secret 569. TV does not turn on, there are 4 flashes in the duty room. There is no start from MC44002P, after replacing it from the FBT, the spark hits the core and the expensive 44002 dies again
Sony KV-M2100K, Fault: the image is strongly shifted to the right with a large turn on the left, the defect may self-eliminate, and then reappear. It turned out that R822 was poorly soldered by 1.8K ohm, along the SSCP circuit, a breakdown occurs for the third time, it seems that this model has a weak point over the years
SONY KV-32FX68U chassis AE-6B. Fault: the TV does not turn on. The LED on the front of the TV blinks 14 times. The posistor of the demagnetization loop of the TH6002 kinescope is faulty
SONY KV-M2540 Chassis BE-3B Fault: there is sound and OSD graphics, no picture. On the ABL bus of board A (-2 volts), although it should be 5 volts. Resistor R829 56 kOhm is interrupted
SONY KV-G21M2. Fault: the TV turns on, but after 5 seconds it goes into standby mode. At the same time, there is sound, control works, the screen is dark, there are no graphics. It is noticed that when the Screen is increased, there is a slight backlight on the screen. Power supply output voltages are normal, lowercase. normal. Faulty IC551 LA7830 and capacity C552 100.0×35 V. at 7 (n) IC551
SONY-KV1984MT chassis GP-1A Fault: there is no sound, the amplifier is assembled on the IMC TDA2007. The 6.2 V zener diode D200 is faulty, the tester shows a short
SONY KV-M2540. Fault: Narrowing (turning) pAstra at the bottom of the screen. Cause. change in the value of the resistor R510 in the power circuit of the STV9379 microcircuit
Sony KV-21DK2. Fault: when turned on, an overload squeak is heard in the SR. At the same time, the power supply of the SR is underestimated to 80 V. When the CP is off, it works normally at a load of 40 W. The reason turned out to be in the ring cracks on the 500 kHz quartz of the CXA1213BS video processor
SONY-29CS30K Fault: the TV does not turn on, the LED on the front of the TV flashes 13 times. Broken line transistor BU2515DX
SONY KV-M2170K Problem: no vertical scanning (narrow band). R814 is cut off according to the scheme. 0.56 ohm
SONY KV-E2561, KV-E2961 chassis AE-2F Fault: when the beam is turned back on, the TV turns off after 1.2 minutes and the LED on the front panel blinks 5 times. Open circuit diode D1351. Through the diode, a voltage of 9 volts is supplied to the IC1351 TDA4780. RGB / CHROMA video processor
SONY KV-21FT1K. Remote RM-887. Fault: when turned on, the self-diagnosis LED blinks 11 times. The standby power supply unit is intact. The main power supply does not work. An open circuit is one of the chain of resistors connected in series R633, R610, R648, all at 330K, in the start circuit of the MCZ3001D PWM controller
SONY KV-G21M2. Fault: does not turn on, the fuse is intact, there is no voltage at the output of the power supply. Broken line transistor. After replacing, I tested the line scan. Start pulses from the video processor. yes, on the preamplifier. yes, at the entrance to the TMS. there are, but not very beautiful, there are no pulses on the collector of the line transistor. TMS was the culprit. Delivered the domestic TMS-21. I also found a burnt out FR in the power supply circuit of 200V video amplifiers
SONY KV-M1400K. Fault: according to the owner, the image was turned on, but after a while the raster began to disappear, while the sound remained. This time was gradually reduced and reached 5.10 minutes. I turn on the TV, indeed, the image is good, but after 10 minutes the screen began to gradually fade away and the sound remained. Service information also disappeared. If the TV is allowed to cool down for a while and turn on, everything appears again and after 10 minutes it is completely dark. During the repair, it turned out that the fault was in the ABB circuit (auto white balance). The signals on the TDA3505 have been checked. RGB signals disappeared at 1, 3, 5 pins, of course the ABB circuit did not work and the screen went out. The signal on the 26th leg also disappeared. If you look at the diagram, then a cascade is assembled there on the Q305 transistor. This transistor is SMD (2SC2712G) A / C amplifier. So in the base circuit for power supply there is a capacitor C329 22.0x16B. He then leaked. After the replacement, everything worked as it should
SONY KV-A2521D. Fault: unstable decoding of PAL signal. Typical malfunction of these models, described on the site repeatedly. Cause. substandard components. The tuning capacitance C302 in the circuit of the 8.86 MHz crystal oscillator was replaced with a constant 10 pF (in another case, according to the site’s materials, it was 18 pF). The fault remained only on one of the PAL encoded channels. The TV works on the cable TV network. strong signal. At the averaged settings, the contrast turned out to be driven by 3/4 of the range, and I removed it by 1/2. everything is fine. Due to over-amplification, the PCTS was distorted, which prevented the decoder from correctly recognizing the signal, plus a known defect in the color module. Obviously this model has problems with AGC too.
SONY KV-G21M1 Problem: on the TV screen, about 10 cm of the top of the image has moved down to the bottom of the screen. I measured the voltage on the vertical sweep. everything is normal, except for 2 legs instead of 0.3v (-6v). I checked the 45th leg of the video processor with an oscilloscope (frame trigger pulse), it is not there (only noise) on the 44th leg, a sawtooth pulse of 100mV. Replaced TDA8366. The TV started working normally
Sony KV-21FT, chassis FE-2. The device was returned for repair after a thunderstorm. Fault: light raster with LOH. Is there sound. The LED blinks 5 times (Unstable current of the kinescope cathodes). Defective diode D504 in the OX pulse chain of the frame scan
Sony KV-G14M1. BG-S. Central processing unit CXP85116B-621S, video processor TDA8366. Fault: when turned on, a high appears for a moment and the TV goes into standby mode. If you turn off the protection, which is formed from three sensors assembled on transistors Q1513 (personnel), Q561 (B) and Q030 (lowercase) on the 50th leg of IC300, and close this leg to the ground and add accelerating ones, we will see a bluish glow and rainbow stripes on the screen Here you can step on a rake and look for a malfunction for a long time, since you might think that the personnel and lowercase are normal. But in fact, the screen glows due to the features of the kinescope and does not mean that there will be a horizontal stripe due to the lack of frame pulses from the TDA8366. In this case, when checking the sensor strapping, a punched C1513 100 / 16v was found. In another device with exactly the same symptoms, R563 180k was cut off in the harness of the Q561 (B) sensor
SONY KV-21LT1K chassis FE-2. Fault: the LED on the front of the TV blinks 11 times and clicks the relay, turning off the main source. But this is not an 8 volt stabilizer, since the TV can be turned on and off with the remote control or the button 10 times, while the TV works fine until you turn it off, then you need to turn it on and off again, but less than 8 times 8. The strapping and triggering resistors of the PWM controller NCZ3001 were checked everything is intact. This malfunction is given by the PWM of the power supply
SONY KV-25FX30K, Fault: the vertical size (pillow) was narrowed, the TV was already being repaired before this defect with the replacement of the line operator and the processor, it worked for only two months, the feeling as if it was not completed in the first repair. Upon opening and inspection, a severely burnt resistor R539 1Kom, 2W, and a swollen capacitor C550 33Mk at 160V were found, after replacing these elements, the size became almost normal, but after 5-10 minutes. work, the resistor again overheated, the reason for this was R595 1 Ohm, which was in a cliff, because of it, and apparently this breakdown happened
SONY KV-25M1K Fault: the TV may turn on, but when you switch programs, it goes into the bowl. mode. Otherwise, the LED is on. It is impossible to turn on the TV, or the LED is off. The TV does not turn on. Fault: annular microcrack all in the same channel selector
Sony KV-G14M1. chassis BG-1S. video processor TDA8375. Fault: the screen is dark, the accelerating voltage can be changed from 200-800V, there is sound, there is OSD, 198v on the cathodes. There is no signal at the outputs of the TDA8375, the sweeps are working. If you increase the incandescence by closing the current-limiting resistor R705, then a sluggish image appears. One of the cannons of the picture tube has died, and the automatics cut out the image. If you do not want to change the pipe and are satisfied with the hooked color, then the automation can be fooled. You can take three resistors of three megohms and solder them on the kinescope board from the 200V bus to the emitters of the transistors that go directly to the cathodes. You can, of course, only roughen up the dead color, but with three you get a slight alignment. Thus, even with a completely dead cannon, the impression of its work is created. Of course, it is necessary to draw out the dead color as much as possible.
Sony KV-M2100K missing or missing color in the PAL system. I offer my own way of troubleshooting. We solder the trimmer capacitor, trying not to knock off its setting. On the reverse side, where the flaring of the rotor lining is performed, we drip liquid flux and simply solder it so that the drop of solder covers all the places of the mechanical connection. We are waiting for cooling and put the container in place. We do the same with the second capacitor. If the position of the rotor does not cause confidence, then initially it is worth adjusting it. And pay attention to the soldering of the TDKS OUTPUTS!
Sony KV-25M1K Problem: during auto-tuning, programs are not fixed, with manual. there is no general synchronization. On the 2nd leg of the BA7046F, instead of the 5v pulse, 0.5v was present. It needs to be changed, but the microcircuit was not on sale. Loaded 820 ohms on 2 leg, thereby increasing the offset to the base of Q120, it began to open and give out sync pulses. A year passed until they returned
SONY KV-S29RN1. Fault: general synchronization was intermittently lost. Also disappeared when tapping the teletext board. Jumper PS01 on the teletext board broke
SONY KV-2185MT Fault: the sound disappears, or is completely absent, when the board is tapped, it may appear again. Check and, if necessary, solder the chip resistor R864 along the MUTE circuit, this is not the first time with this chassis
Sony 21LT1K (made in SLOVAKIA). Malfunction: admitted with a diagnosis. turns off. The screen is filled with red, OHL, after 3 seconds it goes into defense, the LED blinks 2 times. It is very similar to the sagging of the glow in the picture tube, but it turned out that the banal lack of loss on the board of the picture tube
SONY KV-G21M2 chassis BG-2S Fault: Knocking out lines. at first it is small, and after 10 minutes the color disappears, the sound with hiss (similar to sewing the multiplier UN-8.5 / 25 in ULPCT, UPIMTsT). The defect was eliminated after replacing TDKS 8-598-811-00. It took only a small adjustment in the service: the phase of the lines and the horizontal size
SONY KV-M2155K. Fault: the TV does not turn on. Broken line power transistor 2SD1878. Remembering that they rarely fail on their own, which is, as a rule, the reason, I solder TMS and all unreliable solders. I install a new transistor, TV starts up, a characteristic (some kind of inactive) rustle of a high appearance is heard, but there is no pAstra. At the same time, I detect an instant heating of the installed transistor. Once again I check the line scan circuit, high-voltage capacitors, supply voltage. Everything is okay! I am inclined to replace the line scan transformer FBT (859-898-800). I change it and feel bitter disappointment. the defect has not disappeared. Now the shape of the horizontal trigger pulse is under suspicion. The oscillogram shows a littered horizontal trigger pulse. To be sure, I started a pulse from the USR-1 unit (from Rubin Ts-381) and a raster appears, and the transistor is slightly warm! Before changing the TDA8304A synchroprocessor, I check the startup chain. The root of evil ended up in the C840 0.47x50v container. Replaced by 1.0x100v. the TV worked fine
Sony KLV-27HR3 LCD. Brought from Germany. Assembled in Spain 03.2005, Taiwan accessories. New. Fault: when turned on, a menu appears. after a couple of seconds it goes out, blinks two, three times and turns off at. After shutdown, the red LED blinks 4 times. On the LCD E211079 board, one of the seven PWM controllers, the backlight power converters, is faulty. In this case, IC501 OZ9721GN
SONY chassis AE-6. (usually FX66 or LC60). Fault: after warming up, the TV lives its own life. Up to spontaneous popping out of individual menu items. In the conference on TELEMASTER many copies were broken. And they washed and soldered and fried the M board (processor, memory). Colleagues, believe me, this kitchen will not help. It is necessary to change either the M board or the planar processor in it. Please note that you need to look for a processor with a fixed firmware 0359
Sony chassis FE-2. Fault: the LED on the front of the TV blinks 11 times. Check the line scan power transistor. After replacing the transistor, the TV does not start, the LED on the front panel blinks 2 times. We remove the line transformer and check. Most likely the transformer will be faulty. After replacing the transformer, the TV starts up, there is sound, there is no picture. precisely, something is slightly visible if you twist the accelerating voltage. We take a closer look at the strapping of the line transformer. If the chains are ABL. burnt elements D507, D505, R565 are detected, then the central processor with a 90% probability is out of order
SONY KP-S4613, KP-41S4 and similar. Large projection TVs. Fault: included, progressive pillow with ignorance. We climb onto the information board. Two large STK392-150. On the nutrition of one of them. black breaking resistance. We buy and are moved by the amazingly low price of a Chinese product. We cannot change and reduce normally. You need to buy your own (there is still a letter on the mikrushka. L. in my opinion) or just 2 cheap Chinese at once
SONY KV-25M1 chassis BE-3B. Fault: When turned on with the power button, an impulse of the demagnetization loop of the kinescope and nothing else is heard. No raster, no image. The front panel LED is on. To begin with, I removed and examined the main board D. there were many ring cracks in the area of the terminals of the m / frame scan circuit IC500 and the line transformer T803. I carefully soldered the entire board. The TV began to turn on, an image appeared, but there was no reaction to the buttons, there was no control. I replaced the IC002 non-volatile memory chip, installed a new one on the socket (in case of future repairs). The device began to be controlled normally, but sometimes the image disappeared, the raster was also from the LF input. Video all without problems. I decided to solder the tuner. No improvements, even after installing additional ground jumpers, worried about the strong heating of the tuner’s m / circuits. Replaced the Spanish tuner BTP-EC411.8-598-045-01 with the same Malaysian one. Finally, everything worked as it should! The TV as a whole left a vile impression, and the Trinitrona picture is grayish, even in the service mode it was not possible to improve. P.S. The service manual for the repair of this model says that the TV by flashes of the LED indicates a malfunction of the units, however, during the entire period of the repair of the flashes, I have not seen
Sony KV-25M1K. Fault: there is no image from the video inputs, there is sound. There is an external video signal on PIN 34 CXA1855Q (VOUT1), on the basis of Q403 it is also present, but there is no signal on its emitter. The reason is the breakage of R313 (100 ohms). circuit from emitter Q403 to input 29 TDA8366 (EXT CUBS IN)
SONY shassis BE-4, BE-5. I want to return to a defect common in these models: a failure of the PROM, leading to an overestimation of the line scan frequency, which in turn is accompanied by a narrowing of the raster size, complete absence of an image, chaotic flashes of pAstra, etc. In most cases, there is no need to change and rewrite the new m / circuit of the 24CO4 PROM, it is enough to put the TV into standby mode, enter the service mode by pressing the buttons on the remote control in sequence: The screen will display (may not appear): TT. In any case, we enter the value 15 from the remote control, thus rewriting the basic settings from the memory of the control processor into the EPROM. We turn off and turn on the TV again, if the service information appears on the screen, you can start setting up the TV. If necessary, we adjust the geometry of the raster, white balance, adjust the AFC and AGC
SONY KV-3400 is a 1998 model. Fault: when turned on, the power supply starts up. The voltage at the output of the power supply is constantly pulsing. The LED on the front of the TV dims in time with the voltage ripple. There is no sound and bitmap. According to the owner, the TV was repaired at home three times by the same master. After each repair, the malfunction was repeated every week. The culprit of the malfunction is the Q805 2SC2688 line scan pre-output transistor. It was he who was out of order every week. And the reason for the weekly failure of this transistor was the R822 1Kom resistor. During the first repair, the master at home, apparently due to the lack of a circuit, replaced it with a resistance of 5.1 Ohm
Sony KV-29X2D Malfunction: Violation in the lower part of pAstra in the form of discharges and pairing of lines (stripes). Inspection with an oscilloscope showed the presence of an RF patch at the input of the STV9379 vertical sweep microcircuit due to a defect in the filter capacitor C1506 (chip) 0.0022. A similar defect, but in the upper part of the raster, can be caused by a significant increase in the resistance of the resistor R1519 (120 Ohm, 3 W)
Sony KV-2131 Fault: the TV works for several minutes, after which a chaotic twitching of the image begins with a non-periodic interval, with a short-term loss of synchronization characteristic of a breakdown in high-voltage circuits. This thought was reinforced by the oscilloscope test. Emissions characteristic of breakdowns were detected, however, a detailed check with the substitution of all (!) Details of the BSR, including TDKS, did not lead to anything. After several days of observations, a short-term loss of synchronization was found, which prompted to check the synchronization circuit and the division of clock pulses between the TDA2579 and the teletext mode, it was found that there are CHIPs in the power circuits of the teletext module. transistors, leaks in which led to how much heat that the board around them turned black. Replacing the transistors fixed the malfunction
Sony KV-14M1K. Chassis BE-4A. The malfunction manifested itself as follows: the picture was shifted to the left by about 5 cm, the OSD did not work. Replacing the memory chip with the new firmware did not lead to the elimination of the malfunction. The reason was rather unexpected. there was a C809 (1000pF, 2kV) capacitor installed in the line scan
Sony KV-2565MT. Chassis GP-1A. Fault: A few minutes after switching on, the screen goes blank. When examining with an oscilloscope, it was found that at the time of the defect. the horizontal triggering pulses disappear at the output of the IC CXA1213BS. The search for the cause led to the resistor R340 (1.2 Ohm 3 W. stands in the power circuit of the output stage of the horizontal scan), a signal is removed from it to the protection circuit. With a slight warm-up, the resistance of this resistor increased
SONY KV-3400DV2 Fault: a horizontal stripe appears in the light picture, sound disappears, secondary voltages float. Defective C610 (47m50v) in the power supply
Sony KV-G21M2. Fault: no picture, burning smell. Breakdown of S820 (1000nF 2kV) in line scan
Sony KV-G14M1. Fault: with warming up, the phase shifts and the line transistor begins to heat up strongly. Diode D860 is faulty (leakage)
Sony KV-G14M1. Fault: no sound is not tuned to channels (remembers only previously tuned channels). Defective transistor Q031 (2SA1037K) in SMD package. Open base-emitter. Replaced by 2SA1015
SONY KV-G21M2. Fault: when switched on to the network, the power supply jokes, tries to start and the LED on the front panel blinks synchronously. Check and, if necessary, replace C624, loss of capacity. Fault: OX mowing line is visible at the top of the image. Check and, if necessary, replace C552 100.0x16V, near the personnel chip, loss of capacity
Sony KV-29FX66E. Fault: the image and sound disappear, the relay clicks. Screen with a dark raster (as in AV mode), horizontal stripes are visible in the upper part. With the AV input, everything works without interruptions. Suspicion of a tuner with a radio channel (BTF-EC411 BD1M14 8-598-533-01). The replacement gave nothing. The memory (SMD) was flashed. The result is zero. As a result, the SAA5665HL / M1 / 0358 processor was soldered) 100 feet and a flash drive (Samsung143 K6T2008V2A-YF70) on the M board. Only after that the TV worked normally
Sony KV-M2530K. Fault: there is a narrow horizontal bar on the screen. IC1501 (TEA2031A. In the raster correction submodule) turned out to be faulty and the resistor R802 (4.7 Ohm) in the frame scan power supply circuit was cut off. After replacing these parts, the raster appeared, but m / s IC1501 is very hot and a small fold is noticeable on the raster. The reason turned out to be in a faulty capacitor C531 (680.0 x 25V)
Sony KV-2184MT. Fault: no start of line scan. fuse PS801 is open. After starting line scan. on the screen LOH at the top of the raster, vertical nonlinearity and frame rotation at the bottom of the screen. LOH were eliminated after replacing C552 (100.0x50V), and nonlinearity and volvulus. after replacing С558 (470.0х25V)
Sony KV-2184MT Problem: does not hold the setting, or the setting goes away after a while. It can be adjusted by fine tuning, but when switching to another channel, it moves out again. Naturally, automatic tuning does not work (flies). The malfunction has occurred more than once. Remove cm / d of the radio channel and gently solder. And that’s all. True, once I had to tinker: they soldered the tail and soldered all the details, including the SMD. Checked by tapping. Adjustment or repair of the circuits was never required. Obviously due to the fact that the conductors are not built-in in them, but SMD. There was one repetition that was incomprehensible at first: the setting is going on for the clients. except for ORT and GT, but we do not have it during the run. Turned out to be a faulty tuner. in the UHF range. standard non-propay (converters in our workshop and the client are different)
Sony KV-29FX30K Problem: LED does not turn on blinks 11 times. It turned out to be a punched NOT. I replaced it with BU2508DX and carefully soldered the ring cracks in the TDKS area and the line scan driver. The defect is typical for such assemblies and the quality of the solder
SONY KV-14LM1K chassis FE-2 Fault: over time, the sound began to disappear on one, then on a number of programs, the picture remains normal, the flash of the memory chip helped
SONY KV-21B2911K, chassis AE-2 Fault: does not turn on, the LED blinks 13 times, which indicates a malfunction of the vertical scan. Soldering IC1501 did not work. In the course of a detailed examination, the chip resistor R1506 2.2 Kom in the protection harness was replaced
SONY KV-25R1R. Fault: does not exit the standby mode, the LED blinks 6 times. Does not exit the standby mode, the LED blinks 4 times. Replacing the TDKS solved all the problems. 4 times flashes on this model and when there are problems with the CRT
Sony KV-21T5R, chassis FE-1. Fault: we turn it on, after a while the picture begins to narrow at the edges, then the TV goes into standby mode and signals a malfunction, with two, sometimes four and, extremely rarely, five blinks of the LED. It happened that the picture tube simply turned off, but the sound remained, while the LED again indicated errors with two or four blinks. The reason was the destruction of the soldering point (ring crack) on the circuit board on the T531 transformer (according to the diagram)
SONY KV-2155K chassis BE-2A Fault: no pAstra high heat, no sound, voltage 138v, 21v, no 12v. IC802 (7812cv) is faulty, resistor R820.0.47 became 150 ohm, replaced diode D808 with HER207
Sony KV-29FX64X Fault: no sound, the raster is narrowed horizontally, pincushion distortion. Reason: short-term transistor 2SC5698 according to the correction of pAstra next to the NOT, apparently due to the small area of the radiator and the large value of the thermal intensity during operation. With the replacement of the transistor, a larger radiator was installed. The problem of no sound was the spontaneous switching of the sound system from D / K to B / G: in the main menu, the Manual tuning section, you need to change the parameter. PS: from personal experience, I noticed that a significant percentage of failures of TVs of a similar class (Philips, for example), associated with the lack of sound, lie in the problems of line scanning and B / P: non-soldering, ring cracks, high-voltage breakdowns, etc., due to for which the sound system is reset to B / G. If such problems arise, even if everything is in order with the geometry, the prevention of installation in the SR and B / P will not be superfluous
Sony KV-V2120K (video dual). Fault: when turned on, the indicator blinks and goes out once, the relay clicks and silence is heard. Reason: the Q603 (2SD601 smd) transistor is leaking, the base is leaking. emitter. Replaced by 2SC1815
Sony KV-29C3R. Fault: the image with a predominance of red, the mowing line of the return path of the beam is visible. Open R3718 (100R) and burst into two parts R3702 (820K) on the CRT board
Sony KV-X2931 chassis AE-1C. Malfunction: smoked. does not turn on. Breakdown of C613 2200 pF in the power supply. Replacement of C613 2200pf x 2KV, Q602 2SD1548, IC601 TEA2260, chip resistor R612 1Khm, as well as 4 electrolytes around this TEA
Why YouTube won’t launch on Sony Bravia?
YouTube not working on Sony TV? Before fixing the breakdown, you need to establish the cause. YouTube is built-in on all Smart TVs. Turn on TV and watch media content online. The application is as convenient and versatile as possible for all models.
If an error has occurred in the work, then the matter is as follows:
- parameters in the service have been changed;
- the TV is outdated and does not support the application;
- software failure or outdated firmware;
- the program has been removed from the TV;
- technical work on the platform.
Owners of equipment, old 2012, are deprived of the possibility of using software. You can watch files on YouTube through a browser on your TV. Download one of the options or use the built-in application.
What to do if YouTube stopped working on Sony Bravia TV?
If the TV does not support the option, you need to determine the cause of the problem. For Sony TVs, the following methods are recommended:
- free the cache in the internet / browser;
- connect TV to mobile phone and use it as playback source;
- remove new updates and return the phone to its previous state.
Why YouTube doesn’t work on Sony Bravia TVs: reasons how to fix it?
Faced with the question “Why doesn’t YouTube work on Sony Bravia TV?” The YouTube online platform is ideal for watching movies, TV series, vlogs and clips. Previously, the platform could only be used on a laptop or personal computer. YouTube is now available on modern TVs. There are problems with each service. If the program does not open on TV Sony Bravia, then you will need a quick guide. It is posted below.
How can you return YouTube to Smart TV?
If the application icon disappeared from the main screen, follow the instructions. Use the unofficial version of the program:
- download and install a similar YouTube widget on TV;
- unzip the file to external media, sign the folder;
- insert the USB stick into TV ;;
- immediately after switching on, activate Smart TV;
- in the list of programs you will see the line YouTube.
Cleaning Internet Content
After a global software update, sometimes it crashes. It is easy to fix the situation using a system reboot and clearing the cache:
- find the section “Internet connection” in the programs and go further;
- click on the line “Settings”;
- in the window that opens, select the “Delete cache” option and confirm the actions;
- once again open the “Settings” folder and click on the “Network” button;
- activate the “Update” option, after a couple of minutes turn on the YouTube program.
This method is considered more versatile. Unlike a factory reset, it allows you to save files to the TV’s memory. On the contrary, cleaning the device to the factory state will require re-downloading the widget and setting the parameters.
If you have any questions or complaints. let us know
Troubleshooting application problems
Sometimes interruptions appear due to the installation of a new update. Some gadgets do not support firmware and start to glitch and freeze. Clearing memory goes like this:
- launch the “Application” folder on the smartphone;
- then select the line “Program Manager”;
- open the “All” section and find the YouTube button;
- Click on the “Clear data” and “Stop” buttons;
Now turn on the utility and enjoy watching the content.
Connecting smartphone to TV
If the program on Sony Bravia does not work, it is recommended to take a smartphone or tablet as a resource. The main activity is performed by a mobile phone. The TV only reproduces the picture.
Why YouTube doesn’t work on Sony Bravia TV: reasons what to do?
Why isn’t YouTube working on a Sony Bravia TV?. an important question in 2021, since many users prefer to watch YouTube on the big screen. YouTube is a large and popular hosting because it is free, allows you to upload your own videos, has a number of monetization methods, and offers a paid subscription. Well, its greatest value lies in the huge variety of content. For the steps to take if YouTube stopped working on Sony Bravia TVs, read this article.
Troubleshooting application problems
This method is applicable for Android TVs, as they are simpler due to the nature of the system. Inoperability occurs due to malfunctions in the video hosting client program itself. That is, you need to update the OP versions.
- Open Google Play.
- Select “My Apps”.
- In the displayed list, click on the name of the program.
- Click on “Remove”.
Finish the process by pressing “OK” on the TV remote.
What to do if YouTube stopped working on Sony Bravia TV?
If YouTube doesn’t launch on TV, then there are easy solutions. Overview of solution options
How can you return YouTube to Smart TV
The main reasons for YouTube not working on a Sony TV are:
- changes made by YouTube developers;
- lack of normal work in old TVs;
- lags in the application;
- service failure.
To troubleshoot YouTube in Smart TV, you need to:
- download a special program from other devices. for example, TV Cast;
- install a program for streaming via TV;
- connect a smartphone and TV;
- activate the signal on the smartphone;
- enter the IP address in the field on TV;
- upon launch, run the video on your smartphone.
Keep in mind that if a browser is already installed on the TV, then the task becomes much easier. Just open your browser and activate YouTube.
Why YouTube won’t launch on Sony Bravia
The reasons why YouTube doesn’t work on a Sony TV depend on many factors. The main criterion is Smart TV software. If the device is running Android, the reasons may vary. Read more below about why video hosting won’t start.
Cleaning up internet content
The need for this action lies in the possible failures of the OP. To clean up, follow the algorithm:
- open the “Internet browser” application;
- go to “Options” / “Browser settings” / “Delete all cookies”.
And then open the home screen, activate the section “Settings” / “Network” / “Update Internet Content”.
If you have any questions or complaints. let us know
Wait for a while until the system updates the information. And re-link your account to TV using the prompts that are displayed on the screen.
This method is considered to be the best way to solve the problem. Some users carry out a full factory reset, but practice shows that this option is not practical. TV works smoothly until the first shutdown.
Connecting smartphone to TV
A universal method that must be used if the device does not want to work under any circumstances. In this case, the main work is performed by the mobile, and the TV is only a large screen. An up-to-date option for those who use old TV models. older than 2012.
- Download the YouTube widget to your PC.
- Install the USB flash drive into the device you are using.
- Create a folder named “YouTube”.
- Unpack the widget.
- Insert the card into the appropriate slot on the TV.
- Launch Smart Hub on TV.
In the displayed list, the user will see the “YouTube” file. It is similar to the official app.
If the TV does not respond to the remote control, and the red indicator is constantly blinking, then the power supply is out of order. Such a breakdown can also cause the TV to turn on spontaneously. The power adapter is considered one of the most vulnerable nodes of modern TVs running on the Smart TV platform.
The power supply fails as a result of regular power surges. Even a faulty socket can cause damage to this hardware module. Before changing a part, you need to carry out diagnostics. Remove the back cover of the TV. If the component is burned out, there will be soot on the power supply.
You can replace a faulty hardware module yourself. However, only if you have the appropriate skills. You need to be well versed in electronics and know the basic laws of physics. If there is no equipment and knowledge, then you should not expose the equipment to the threat of aggravating the breakdown. Contact the service center. Engineers are able to quickly install a proprietary power supply.
If you changed the power supply unit yourself, the TV works, but it still turns on randomly, then you need to call an electrician. A specialist must measure the voltage of the outlet, and then adjust the power supply.
Sleep timer enabled
Smart TV settings are extremely easy to get confused about. Therefore, it cannot be ruled out that the user is directly related to the arbitrary switching on of the TV. Many people prefer to fall asleep to music videos, movies or TV shows. Therefore, a sleep timer is used. The bottom line is that after a set time, the device automatically turns off.
Why does the TV turn on by itself if the settings timer is off? This function can work in both directions. Therefore, you need to carefully study the settings, mainly because of this reason, the TV automatically turns off. How to fix the situation? There is nothing complicated. There is no need to contact the service center. You just need to change the sleep timer settings.
Take your TV remote control, and go to settings. Select the “off timer” section. See what time you set earlier. Change the shutdown parameters or deactivate the sleep timer altogether. If you want to continue using this function, then you just need to change the time. It is likely that the time displayed was incorrect. Therefore, the TV turned on randomly. The device will start to function correctly immediately after changing the settings.
Why the TV turns on randomly and how to fix it
There are plenty of discussions on this topic in various forums. Contrary to the popular belief that the TV itself turns on due to otherworldly forces, experts have a completely rational justification for the appearance of such a problem. All reasons can be conventionally divided into two groups. software failures and hardware failures. The difference between them is enormous. Each and every user can eliminate system errors. Rebuilding hardware modules is much more difficult. Since this requires special equipment.
What should the user do if the TV turns on randomly? Of course, turning on uncontrollably in the middle of the night creates some discomfort. Therefore, the problem needs to be fixed, but how to do it? It all depends on what exactly caused the TV to start turning on on its own. We will analyze common breakdowns, as well as give specific recommendations for their elimination.
On the forums, you can find many user complaints that the Samsung TV turns itself off after a firmware update. In fact, this problem is typical for technology from various manufacturers: Philips, Sony, LV, etc. Automatic updating of the Smart TV platform is certainly a useful feature. However, sometimes it becomes the reason that the TV starts to turn on randomly.
If the TV’s automatic software update is disabled and the problem persists, you need to install an older firmware version. It is possible that the beta version was automatically installed, in which there are certain flaws. In this case, it is better to roll back to the previous version.
Instructions for disabling automatic firmware update:
- Press the “Home” button on the remote control.
- In the “Settings” section, select the “Help” section.
- In the list, select the function “System Update”.
- Disable this option using the remote.
If you disable the automatic installation of updates, then the new version will need to be installed manually. This is extremely easy to do. Go to the official website of the TV manufacturer. Enter the name of the TV model you are using. Download the update files, and then transfer them to a USB flash drive or external hard drive. Insert the USB stick into the USB connector. Run the downloaded file. A notification will appear on the TV screen that updates are being installed.
After the installation is complete, the TV will automatically reboot. After that, you can use the device as usual.
Power surges, disturbances in the operation of outlets, wiring problems. all this can also cause the TV to turn on itself at night. For example, voltage drops have an extremely negative effect on capacitors and diodes. These components ensure the correct operation of the screen, regulate the process of switching on and off. Such a malfunction is extremely difficult to eliminate on your own.
It is possible that the Samsung TV turns on itself due to interruptions in the power supply to the inverter. After all, even insignificant damage to the microcircuit or microcontroller will provoke voltage surges in the power system. It is better to entrust the hardware repair of modern TVs to specialists. Service engineers will use an oscilloscope to “ring” the contact circuit, which will eliminate the negative consequences of a short circuit.
This breakdown is to a certain extent similar to the situation when the TV power button does not work. It is possible that the “Power” key on the remote control sinks or is not pressed the first time. As a result, the device turns on randomly. Remote control problems can also be caused by a broken infrared sensor.
There are more commonplace reasons for the malfunction of the remote control. For example, batteries run out. Because of this, it works every other time. In any case, it will not be difficult to eliminate this breakdown. Mostly the consoles are not repaired, but a new one is simply bought. If you use a modern Samsung TV, then you can download a special application to your smartphone, with which you can also control equipment.
There are often situations when the “Power” button located on the front of the TV is stuck and not pressed. This occurs as a result of mechanical damage. Sometimes a key is pressed but does not work. Most likely, the plume was damaged. Be sure to check the functionality of the button. Since problems with it can cause the TV to turn on spontaneously.
Breakage is eliminated by replacing the key. Users may have problems with this. First, you need to purchase a button that will fit your TV model. Secondly, the broken key must be carefully removed, and then a new one must be connected. This requires a tool and skills in carrying out such work. Therefore, if you are unsure of your abilities, then contact the service center.
Moisture and dust ingress
Dust and moisture deposited on the surface of microcircuits can lead to short circuits, as a result of which the basic hardware modules burn out. Therefore, it is necessary to adhere to the rules of caring for equipment in order to maximize its operational life. For example, moisture gets in due to the fact that many users spray cleaning products on the screen. This cannot be done. Spray liquid onto a dry cloth or microfiber, and only then wipe the screen.
Absolutely all devices need regular cleaning from dust. Televisions are no exception to this rule. It is possible that the TV turns off and turns on randomly due to dust deposited on the microcircuits. The accumulation of dirt is conductive. Therefore, they are a catalyst for the appearance of sparks. The result is a short circuit. To clean the equipment from dust, remove the back cover, and then gently blow out the dust with a vacuum cleaner.
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