The TV is working but the screen is dark

There is no picture on the TV, but there is sound. how to fix the problem

In our time, a rare person does without a TV. Every year the models become thinner, larger and offer more and more new functionalities. Modern plasma screens with Smart TV technology have little in common with devices that were on sale some ten years ago. However, the commonality between the old and new generations still remains. breakdowns and malfunctions still happen. The reasons for this can be very different: blows, falling, ingress of moisture and direct sunlight, or an elementary marriage. In this article, we will take a closer look at what to do if the TV has lost the image, but there is sound. Let’s figure it out. Go!

What to do if there is no picture on the TV

First, it should be noted that a SIMilar malfunction occurs quite often in a variety of brands of TVs. TVs of all brands are equally affected by this: Samsung, LG, Philips, Sony, Panasonic and many others. Therefore, there is no point in blaming the manufacturer.

There are many reasons for the absence of an image on the screen, and you will hardly be able to determine it yourself by eye. Most likely, you will still have to contact a service center or other repair service. It all depends on the nature of the problem. on this below.

It happens that when you turn on the TV, a splash screen with the manufacturer’s logo appears first (LG, Samsung, Philips, and so on), after which the screen SIMply goes out. With this, you can change channels and hear the sound. Some users noticed that after a while the image appears, but when you turn it on again, everything repeats and there is no picture. In this case, try the following tips:

  • Check the cable connection of the receiver as it may have come off. Make sure the cord is plugged in securely. If there is no video signal from the set-top box, many TVs SIMply turn off the screen.
  • Also, the problem may be in the cable itself. The wire may be damaged or SIMply be of poor quality. This applies not only to HDMI cables, but also to cables with bells. In them, the transmission of the audio signal and the video signal occurs through separate wires, and the problem may lie SIMply in a broken wire or its poor contact. In some cases, replacing the wire can correct the situation.
  • Check the power cable. It must also be securely connected.
  • Some users have found a rather original way to solve the problem. to increase the volume to the maximum (or close to it). After a few seconds, the image will appear and then you can set an acceptable volume level.

Please note that all the above tips will only help if the screen is working. This is indicated by the splash screen when the TV is switched on. If the screen saver is absent and the screen is constantly dark, this already indicates that some component of the TV that is responsible for the image is out of order.

There are several components, failure of which can cause no picture on the screen. The breakdown of the inverter, which supplies voltage to the backlight lamps, is quite common. The lamps themselves can also fail, and this, in turn, provokes a breakdown of the power supply. In addition to the faults listed above, it is not uncommon for a matrix or motherboard to break down. Also, the problem may lie in the loops, converter and decoder. In this case, non-working parts and elements will have to be replaced with new ones.

It is not recommended to carry out repairs on your own, since modern TVs are rather complex devices, and you run the risk of aggravating the situation even more. If the above SIMple tips did not help, then the best solution would be to turn to professionals, since the TV will need to be disassembled. It can be a service center of a manufacturing company or a private office, where repairs will be carried out efficiently and quickly.

One way or another, it is impossible to determine what is the reason for the breakdown of your TV without a thorough examination. In any case, the device must be disassembled and diagnosed for non-working parts and components. It is best if this is done in a workshop with appropriate conditions, however, if you do not like this option, then many telemasters provide all these services at home.

Of course, replacing some parts can cost a pretty penny, but it should be noted that matrices or motherboards themselves rarely fail. Usually, damage occurs as a result of physical damage to the part, for example, when the TV falls or gets wet. In general, you cannot do without a telemaster.

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Now you know what to do if the TV has lost the picture, but there is sound. You will also understand what could be the reason for such a malfunction. Write in the comments if this article was useful for you, share with other users your experience in solving SIMilar situations, and ask any questions of this article.

Why LG TV screen may darken

working, screen, dark

There are a number of malfunctions due to which the screen darkens and the TV receiver stops displaying the picture. They are the same on TVs of different brands and can appear on both LG products and devices from Samsung or another brand.

If, when turning on the LG TV, the user discovers that the screen has become dark, and the picture is practically invisible, the cause of the breakdown may be:

  • defect in the power supply;
  • malfunction of the video amplifier;
  • failure in the matrix backlight;
  • broken T-con controller.

If the power supply fails due to a power surge, poor-quality soldering, swollen capacitors or for other reasons, the TV screen will stop glowing or stripes will be visible on it.

For diagnostics, the device is de-energized and disassembled. Signs of failure are burnt elements, burnt holes, swollen capacitors, etc.

You need to find the damaged unit and fix it, sometimes you need to replace the power supply completely. You can check the part after repair using a multimeter or a connected ordinary light bulb.

If the unit is working properly, it will light up brightly, then dim and burn at half power. If the unit is damaged, the lamp will constantly glow very brightly. The same method will save the microcircuits from damage when connecting a faulty or incorrectly repaired unit.

It is necessary to inspect the damaged unit and check the integrity of the capacitors. Broken elements are replaced, in rare cases, the entire defective part is subject to replacement.
Failure of a T-con board is SIMilar to a malfunction of a motherboard, so it is better to entrust such repairs to specialists. Some TVs are equipped with a special diagnostic function for the T-con board. It is necessary to disconnect the power supplied to it and the LVDS cable.

A test picture will appear on the screen, if there are distortions on it, this means that the part is out of order. In most cases, a complete board change will be required. Sometimes oxidation on the LVDS cable pins can be the culprit for the problem. If you clean them with a regular eraser, the problem disappears.

Samsung

Often consumers are interested in why the screen on a Samsung TV turned dark and what to do to fix the breakdown. Appliances of this brand break down for the same reasons as LG devices. To fix the problem, you need to check the power supply, video amplifier and T-con board. If these parts are intact, the malfunction may be related to the matrix.

The matrix cable is damaged

The image on the LG TV may disappear due to damage to the matrix loop. a set of contacts and wires that connect the board that forms the image and the display.

To check the performance of the loop, you need to perform a visual inspection of the wires. The damaged areas can be re-soldered to help restore the screen to work. At the same time, there is a high probability of repeated breakdown of the matrix loop.

Therefore, the best solution to the problem is to replace this component with a new one. When choosing a matrix cable, you need to pay attention to the TV model. the part must be original and compatible with the TV brand.

Why LG TV screen may darken

There are a number of malfunctions due to which the screen darkens and the TV receiver stops displaying the picture. They are the same on TVs of different brands and can appear on both LG products and devices from Samsung or another brand.

If, when turning on the LG TV, the user discovers that the screen has become dark, and the picture is practically invisible, the cause of the breakdown may be:

  • defect in the power supply;
  • malfunction of the video amplifier;
  • failure in the matrix backlight;
  • broken T-con controller.

If the power supply fails due to a power surge, poor-quality soldering, swollen capacitors or for other reasons, the TV screen will stop glowing or stripes will be visible on it.

For diagnostics, the device is de-energized and disassembled. Signs of failure are burnt elements, burnt holes, swollen capacitors, etc.

You need to find the damaged unit and fix it, sometimes you need to replace the power supply completely. You can check the part after repair using a multimeter or a connected ordinary light bulb.

If the unit is in good working order, it will light up brightly, then dim and burn at half power. If the unit is damaged, the lamp will constantly glow very brightly. The same method will save the microcircuits from damage when connecting a faulty or incorrectly repaired unit.

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It is necessary to inspect the damaged unit and check the integrity of the capacitors. Broken elements are replaced, in rare cases, the entire defective part is subject to replacement.
Failure of the T-con board is SIMilar to the failure of a motherboard, so it is better to entrust such repairs to specialists. Some TVs are equipped with a special diagnostic function for the T-con board. It is necessary to disconnect the power supplied to it and the LVDS cable.

A test picture will appear on the screen, if there are distortions on it, this means that the part is out of order. In most cases, you will need to completely change the board. Sometimes oxidation on the LVDS cable pins can be the culprit for the problem. If you clean them with a regular eraser, the problem disappears.

LCD screen

On LCD TVs with CCFL backlights (fluorescent lights), the backlight may not work because of blown backlights, broken inverters, broken wiring, etc. To fix the problem, you should contact the specialists.

Matrix malfunctions

If the user sees a dark screen when turning on the LCD TV, the most difficult malfunction is associated with a breakdown of the matrix backlight.
Broken backlighting is the most common cause of a dark screen on TV. To make sure that the reason is precisely this malfunction, you need to check the technique.

To do this, you need to shine a flashlight on the screen. If the image appears, then you will need to disassemble the TV receiver and look for the cause of the breakdown. To repair the TV, you need to contact a professional, an attempt to fix the damage on your own can cause even more damage to the device.

Matrix malfunctions

If the user sees a dark screen when turning on the LCD TV, the most difficult malfunction is associated with a breakdown of the matrix backlight.
Broken backlighting is the most common cause of dark screens on TVs. To make sure that the reason is precisely this malfunction, you need to check the technique.

To do this, you need to shine a flashlight on the screen. If the image appears, then you will need to disassemble the TV receiver and look for the cause of the breakdown. To repair the TV, you need to contact a professional, an attempt to fix the damage on your own can cause even more damage to the device.

Broken power supply

Another reason why LG TV has a black screen instead of an image, but there is sound is a breakdown of the power supply.

To carry out self-diagnosis, you need to do the following:

  • The capacitors must be discharged first. To do this, turn off the TV completely and unplug it.
  • Remove the back cover and check the functionality of the fuses, cables and cables.
  • Now carry out a visual inspection of the power supply: if it has charred or melted resistors and capacitors, then these components need to be urgently replaced.
  • Measure the voltage of the output circuit of the power supply. all measurements must match those indicated in the technical documentation of the LG TV.

It is better to entrust the replacement of parts to professionals. employees of service centers or repairmen of household appliances. Improper replacement of resistors or capacitors can lead to new breakdowns or short circuits, which will require buying a new TV.

Burnt capacitors

Capacitors can burn out in the TV. they are used to store the charge and energy of the electric field. This problem is especially common in models with a liquid crystal display. One of the reasons for the breakdown of these components is sudden voltage drops.

To determine if the capacitors are faulty, you need to remove the back cover of the TV. All the main components that are responsible for TV operation are on the board. If the capacitors are swollen. slightly increased in size. this means that an urgent replacement of parts is required. Sometimes, swollen capacitors will explode, which can cause damage to other components on the board.

Matrix loop

Sometimes the image on the LG TV disappears due to damage to the matrix cable. Breakage manifests itself in the following signs:

  • the image periodically disappears;
  • unsatisfactory picture quality. noise, ripples appeared;
  • horizontal or vertical black-and-white, colored stripes appeared.

The specifics of the elimination of the breakdown will directly depend on the specifics of the damage to the loop. If the malfunction was detected at an early stage, then the service center masters will rewire the damaged sections of the loop, restoring the TV operation. In some situations, you have to change the matrix cable completely.

The second option is considered a more durable solution to the problem. A soldered loop will work for a relatively short time. Therefore, it is wiser to immediately change it to the original component. You should not do this on your own. Entrust the work to professionals.

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Plasma screen

Plasma TVs do not have a matrix backlight, so the reasons for the absence of an image are different. This can be burnout of pixels (phosphor layer) due to direct sunlight, dust that has got inside the device or failure of the cooling system, etc. To diagnose and identify the cause of the breakdown, you will need the help of professionals.

On LED TVs, a breakdown may be in the power driver of the matrix backlight or in burnt-out LEDs. To determine a breakdown, you need to check the voltage. If the driver is defective, it is missing. If the LED fails, the current is supplied, but due to the breakdown of one link, the circuit opens and does not work. Burnt out diodes are not repaired, but completely changed.

Burnt out power supply

If there is sound, and the picture is constantly twitching, the screen is dark, the brightness has dropped, other defects have appeared, then the power supply unit of the LCD TV is not functioning correctly.

However, the diagnosis can still be carried out independently at home:

  • Start by discharging the capacitors. Unplug the TV from the wall outlet. Unscrew the fixing bolts, and then remove the rear cover. Check cables and loops, some of them may be damaged. Be sure to test the functionality of the buttons and fuses.
  • Inspect the power supply for melted or charred resistors, capacitors. If there are such elements, then they must be replaced immediately.
  • Measure the voltage of the output circuits of the power adapter. The obtained indicators must correspond to the parameters indicated on the board or in the documents of the equipment.
  • Voltage drops. For example, the voltage level reaches 200V, find the cause of the breakdown in the primary power circuit.
  • If you knock on the TV case, and the image is normalized for a few seconds, then the problem was caused by poor-quality soldering of the power supply elements.

Soldering contacts and other elements must be carried out with professional equipment. The use of improvised means is fraught with the aggravation of the original malfunction.

Samsung

Often consumers are interested in why the screen on a Samsung TV turned dark and what to do to fix the breakdown. Appliances of this brand break down for the same reasons as LG devices. To fix the problem, you need to check the power supply, video amplifier and T-con board. If these parts are intact, the malfunction may be related to the matrix.

LCD screen

On LCD TVs with CCFL backlights (fluorescent lamps), the backlight may not work because of blown backlights, broken inverters, broken wiring, etc. To fix the problem, you should contact the specialists.

Matrix malfunctions

If the user sees a dark screen when turning on the LCD TV, the most difficult malfunction is associated with a breakdown of the matrix backlight.
Broken backlighting is the most common cause of dark screens on TVs. To make sure that the reason is precisely this malfunction, you need to check the technique.

To do this, you need to shine a flashlight on the screen. If the image appears, then you will need to disassemble the TV receiver and look for the cause of the breakdown. To repair the TV, you need to contact a professional, an attempt to fix the damage on your own can cause even more damage to the device.

TV repair cost

To understand why part of the TV set screen or the entire monitor does not light up completely, it is necessary to disassemble the TV and perform its diagnostics. If you are not confident in your own abilities, it is worth calling for the help of professionals so as not to cause even more damage to the equipment.

TV repair cost

To understand why part of the TV set screen or the entire monitor does not light up completely, it is necessary to disassemble the TV and perform its diagnostics. If you are not confident in your own abilities, it is worth calling for the help of professionals so as not to cause even more damage to the equipment.

Reasons for the disappearance of the image

The most common reason that the image on the LV TV disappeared is hardware failure. What to do in such situations? How can I restore the correct broadcast of digital or analog TV? It is necessary to carry out diagnostics to determine the failed module.

Immediately after identifying a damaged component, it must be replaced. You can do this yourself. However, this option is relevant, provided that you have the necessary skills and equipment. If you do not know how to repair TV, then contact the service center.

Now let’s move on directly to considering the main reasons for the disappearance of the image.

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