Laptop Turns On Black Screen Indicators Are Off
The power indicator is on, the laptop does not turn on: causes and solutions
In some cases, it turns out that, despite the fact that the power indicator is on, the laptop does not turn on. Why does this situation arise? What do you need to pay special attention to? What may be required to correct this situation? It is actually not as easy to understand all the emerging issues as it might seem at first glance. The personal computer is a rather unpredictable piece of equipment. Power up problems can be the result of many failures. Some users are in a hurry to go to service centers. This is not recommended. First, it is advisable to independently diagnose the problem that has arisen. It may be possible to cope with the situation without assistance.
Laptop won’t turn on even though the power light is on? There are various reasons for this phenomenon. The first thing to think about is a problem with the card. In the case of a stationary PC, it is quite easy to detect and fix such a breakdown. To do this, just take out this component and connect it to another machine. But in the case of laptops, the user will have to try. If you suspect a malfunction or breakdown of the card, it is recommended to contact the service centers for help or call the system administrator for help. You don’t even have to try to diagnose the problem yourself. The laptop usually turns on by itself. you can hear the cooler work. But there is no picture on the screen. Sometimes you can even hear the operating system loading.
If the power indicator is on, but the laptop does not turn on and the problem with the card is excluded, then the monitor may be damaged or broken in the device. This is an extremely rare occurrence that sometimes occurs in practice. If the display is broken, then the reasons for the breakdown are likely to be the same as in the case of the card. In this case, there will be no images on the monitor, but the sound of turning on the OS will appear. You will NOT be able to deal with this problem on your own. Your only option is to buy a new laptop. You can try to contact the service center under similar circumstances. Perhaps the display can be repaired there. Usually, after such a repair, the devices do not work for long. Ultimately, you still have to replace the laptop with a new one.
The following possible situation can be corrected without assistance. What if the power light is on but the laptop still won’t turn on? The main reasons for this phenomenon are a crash or reset. Perhaps the BIOS settings are out of order. It is for this reason that the problem in question could occur on the laptop. In this situation, it is recommended to perform a BIOS reset and the computer should then be fully operational.
lack of ingredients
What else could have caused this problem? If we are talking about a new laptop, which worked before, it should not be ruled out that there are no components. If the laptop itself turns on, but nothing is displayed on the screen, And the NumLock and CapsLock buttons do not go out, then the BIOS is probably being initialized. Probably, the laptop has RAM or a processor. If we are talking about a device that was previously functioning, then the reason may be hidden in the breakdowns of the components listed above.
In some cases, it happens that despite the power indicator is on, the laptop still does not turn on, although it worked normally before. The hard drive is causing the problem. One small crash is enough for the computer to refuse to start. In this case, the power button will still be lit. You may also notice that the fan is operating normally. In this case, the NumLock buttons and others light up and go out, as expected. It is recommended to disassemble the laptop and disconnect the hard drive. Now try switching on again in this state. It did not help? Then you can try again to gently attach the component. If the problem was a crash, then it should go away.
What if the power light is on but the laptop still won’t turn on? Diagnosing the problem in this case will require certain knowledge from the user. DO NOT rush to take your computer for repair. It should be borne in mind that most of these problems are usually solved with the help of a specialist. You can solve the situation yourself if the problem is with the battery. She was probably just discharged. Then it will be enough just to connect the power to the network and the computer and try to turn on the devices again. It is better to wait a few minutes before pressing the laptop power button. This will allow the battery to receive some charge. This technique turns out to be quite effective. Some experts also recommend removing the battery completely from the laptop and then connecting the power cord to it. After that, you need to turn on the computer and observe the situation. If the computer is working at full capacity, then nothing else needs to be done. Otherwise, the source of the problem will have to be addressed elsewhere. Practice shows that a discharged laptop or battery problems are quite common. These problems are eliminated quite easily and without assistance.
What to do if Samsung laptop won’t turn on? In this case, the power indicator is on and the cooler is working. The following reason is quite rare. It is almost impossible to diagnose it yourself. This malfunction can appear if the laptop is damaged in the south or north bridge. Why does this situation arise? Bridge problems can be caused by various causes, such as short circuits caused by temperature differences. If, because of this, the USB port on the laptop is damaged, then the appearance of the problem under study will be quite likely. In this case, there will be only one method of fixing this problem. repairing damaged components. Buying a new PC will be the most effective way to solve this problem. Repaired components in laptops are unlikely to last long. Here, each user will have to independently decide what to do.
If the laptop refuses to turn on, but the device has previously functioned for some time, then you should think about the impact on the device of viruses. Often, a computer infection leads to the fact that the computer simply stops functioning normally. In some cases, it comes down to BIOS virus damage. In this case, problems with turning on the laptop may occur. It is unlikely that you can fix the problem yourself. As with most of the previously mentioned cases, it is best to take your computer to a service center right away. Here you will be helped to restore the laptop to work and cure it from viruses. Fortunately, this scenario is quite rare. However, it should be excluded, especially in cases where the user himself admits the presence of viruses on the computer. In some cases, problems associated with switching on the laptop occur after the OS is treated. In this case, it will be enough to first reinstall the BIOS, and then the operating system. After that, no problems should bother you.
Let’s summarize preliminary results. To begin with, it is worth noting that diagnostics and troubleshooting in most cases boils down to contacting a service center. Most often, many do just that. After all, a laptop is a rather complex device. It is actually not as easy to repair it yourself as a desktop computer. If you cannot figure out on your own why the computer does not turn on, then you can immediately contact a specialized service center for help. If you suspect a specific problem, be sure to inform the service center staff about it.
The laptop does not turn on and does NOT show signs of life
In most cases, we have nutritional problems. The first thing to do is connect the laptop to the power supply and check that there is voltage in the outlet :). Power adapters usually have a light bulb to indicate they are working. And on the laptop there is an indicator that signals the inclusion in the network and / or battery power.
Most often, the power supply does not work, or it functions defective (here just try a similar working one), bad contacts in the connector, broken or bent wires. Look at the whole thing and draw a conclusion. at what stage the power is lost.
So that there are no problems with the power connector, I advise you to insert the power plug into the laptop first, and then only the power cord into the outlet. By this, we exclude the possibility of a short-term appearance of a spark when the plug is connected, which spoils the contacts.
If everything “burns”, and the laptop still does not turn on, then the problem may not be in the power supply. Try again to remove the battery and turn on the device again without it, then after 10 minutes put the battery back. Also Disconnect all connected external devices (you can also disable the Wi-Fi adapter if the design allows).
Try to turn on, and if it works, then I return the devices in turn, and so you can determine what was the matter.
If your laptop does not turn on and there is still a warranty, then immediately contact the service center!
Perhaps this is all that you can do yourself without disassembling the laptop, if it really does NOT show signs of life at all or shows a black screen. serious reasons may include a non-working motherboard, a broken internal power controller, a south / north bridge, broken contacts inside the device, BIOS firmware failure, and others.
Fans are making noise, but laptop screen is not working
Maybe the laptop itself turns on, but the screen does not work. Take a closer look at the monitor, maybe there is something there, but the backlight does not work. Define hotkeys for turning on the backlight on your laptop and press them. For example, on many Lenovo models, these are “FnF2” buttons.
The screen may really not work, and there are also various artifacts instead of the image. The surest way to check if the screen or laptop is at fault is with an external monitor by connecting it to the VGA / HDMI output. If there is a picture on it, then the laptop screen will definitely not turn on. Read more about this in the article about stripes on the laptop screen.
A discrete card can often be a prerequisite for a malfunction, especially for those who like to play games on a laptop. Due to a poor cooling system, dust / pollution thereof or misuse of your “friend”, cards overheat and break faster. This is especially true for nVidia cards (GeForce 8400M, 8600M, 9300M and others).
No need to play with the computer on your knees, on your stomach, or in any position that blocks the vents. It is advisable to use laptop cooling pads. And in general, if a laptop is not positioned by manufacturers as clearly GAMING, then it is not recommended to play heavy toys on it for a long time, even if it pulls them. Monitor the temperature of the card.
So, if the matter is in the card, then try to pull it out, if the design allows it, or turn it off using the switch, which is present on some models. Without a discrete card, “beech” can work, just won’t go Demanding games.
There may be more serious reasons: missing / not working processor or memory, broken BIOS firmware, non-working laptop north bridge (problems with the motherboard).
Windows starts to load, but everything is bad.
It’s such an option that, as usual, Windows starts loading, but then the laptop reboots itself, errors appear on a black or blue screen. Here again, there may be a problem in the hardware, i.e. hardware failures, and maybe software.
The surest way to test, again, is to reinstall Windows. “Light” check option. will run from a bootable USB flash drive with Windows. If the laptop with it behaves similarly badly, then it is probably rubbish, you need to carry it for repair. In general, Windows boot problems are a completely different story.
Constantly reboots or shuts down
The laptop can reboot indefinitely before attempting to boot Windows. This is a serious hardware problem, the south bridge may overheat, usually due to a short circuit in it. Most often this happens due to a breakdown via USB (remember what you inserted into the USB connectors).
Or CPU overheating due to a dusty cooler or a loose heatsink. But this is rare and is mainly accompanied by high fan speeds. In this case, the laptop may turn off or reboot at different times.
In the absence or poor power supply, the following picture can be observed: the device turns on, but quickly goes out due to a dead battery.
Writes that it is impossible to start from the boot device
There may be different messages in English, for example “Error loading operating system” or something similar, and then the laptop will not boot. First, remove all flash drives and disk from the drive and reboot. If it does not help, then it is either a hardware or software problem Hard disk.
The first one is solved by contacting the service center, but first you need to check that the problem is in the disk. The most affordable way is to reinstall Windows yourself. If it helped, then the problem was at the software level.
Laptop won’t turn on. problem solution!
Did you run your laptop for a year or two and stop turning on? Or maybe it did NOT work at all # 128521; Well, such a nuisance happens, and in this article I will tell you what you can do in this situation yourself, and when you need to contact the specialists at the service center.
All problems with a laptop can be divided into two parts: hardware and software. Hardware problems are physical problems with the device, i.e. when repair is needed “by hand”. And the software can be solved on the spot, do not get up from your chair. This includes problems with BIOS setup, operating system, and programs.
First, let’s define our problem a little. If the laptop does not turn on at all, i.e. DOES NOT show signs of life, then the problem is definitely hardware. If it comes to loading Windows, but then something goes wrong, freezes, reboots, then here is 50/50. Next, I will describe the diagnostic steps, and you can skip the problems that you have. Accurate fault diagnosis is already half of the repair.
Turns on, shows a splash screen or writes something and hangs
It may be that the initial splash screen appears or information is displayed, but then the laptop does not start, it also beeps or writes about errors. The probable cause is problems with BIOS settings. You just need to enter BIOS and reset all settings to default. In different versions this item may be in different places, but the name is approximately the same “Load BIOS Defaults”. the keyword “defaults”. Then I will exit with saving the settings (“Save Settings and Exit”).
Please note that the system may be reporting some kind of error, but further loading is possible, you just need to press a button. For example, it can write “Press F1 to continue”, which means you need to press F1 to continue loading. This usually happens when the battery on the motherboard runs out (not to be confused with a large battery), the time and BIOS settings get lost. The battery must be replaced at a service center.
This is the simplest thing you can do yourself, because problems can be more serious, for example, a hard disk or RAM failure. With a certain skill, problems with the Hard Drive can be blindly diagnosed by listening to the laptop # 128578; The working disk, when turned on, spins the engine and crackles for a couple of seconds, read information. In case of problems, the engine may unsuccessfully try to start several times, or the heads crackle cyclically, trying to read something from the plates, while everything hangs on the screen.
Some models have open access to RAM sticks. If there is a suspicion of it, then you can try to remove the trims, carefully clean the contacts (see how to do this in the article “Why the computer does not turn on”). If it does not help, then leave one memory module (if there are several) and try to start. If there is only one bar, then it stopped in another slot.
Let’s sum up
So what if the laptop won’t turn on? First, think about what happened, what was the last time they did it. If you played for a long time, then the card or other chipsets of the laptop probably overheated and a qualified repair is needed here.
If you installed some programs, rebooted and that’s it, then there are most likely errors with Windows. The main problems that can be diagnosed and / or solved by myself, I described in the article. Finally, I will advise NOT to make rash conclusions and DO NOT disassemble the laptop without proper experience.
The multicontroller is out of order
The reason for this may be a flashed firmware of the microcircuit, water damage or voltage surges on the bus from the power supply unit (all 19 Volts from the power supply unit are supplied to the cartoon!). One way or another, it fails and does not give us an indication in the connected charging, does not give a response to the button and the laptop does NOT start. Such a multicontroller needs to be changed! In some laptops, multicontrollers need to be flashed (programmed) before installation, the manufacturer writes the data necessary for the logic to work in the flash memory of the microcontroller. Most often, there are multicontrollers without firmware, such controllers are easy to install, verification also Takes little time.
The laptop does not turn on, the lights are off
Why are the indicators off?
First of all, do you have a battery connected? Some laptops will not have LED indication without battery connected.
Imagine a wizard who diagnoses the laptop’s power circuit: first of all, the charger and laptop connector will pass the test, because they often break out, the contacts get dirty, the charging connector is the most frequent breakdown in the power circuit. Let’s say the charging connector is intact, the voltage goes through it to the “first link”, but the indicators do not light up like that, comments on the reaction enable button. Next, you need to check the power button itself, does it work? On older laptops, the button oxidizes internally and DOES NOT close the contacts to give a power-on signal. After the initial “rough” protection for short circuit and polarity reversal, there is a special microcircuit that supervises and controls all the main modules of the laptop for power. this is a multicontroller.
If there is a short circuit on one of the main power lines of the laptop (1V, 3.3V, 5V, 12V), then you can get the same symptoms as if the multicontroller fails.
A short circuit can occur if the laptop is not properly assembled (overtightened the bolts, short to the case, or passed the wire insulation), when water gets into the laptop, under voltage, the MOSFET keys in the down-stabilizer circuit are out of order, 19V got where it should be 5V, other ICs are out of order, and so on.
Why the laptop won’t turn on?
If your laptop does not turn on when you press a button, whether with a battery or without a battery, with a power supply connected or not, and most importantly, the indicators are off (see photo), then the laptop’s power circuit is to blame. In many laptops, in the first link of the power circuit (where 18-19V from the laptop’s power supply gets into) there are protective elements. diodes and fuses. Diodes protect against reverse voltage (it can appear in a laptop when using a non-native charger), and fuses provide current and short circuit protection. After overvoltage and reverse voltage protection, there is a control microcircuit. a multicontroller. She often fails.
What is a multicontroller, what it does and how is it related to indicators
A multicontroller, or, as it is often called by the masters, “cartoon” is a microcircuit that generates a signal to power the processor, card, USB buses, second components.
The power button is put into the multicontroller, when you press it, the cartoon checks all tires for short circuit and gives permission to start.
The processor unlocks and starts reading the code from the BIOS. This is how the laptop starts booting. But in our case, there is a download. And there are no indicators either. LEDs for power, hard drive and keyboard unit are also fed into the multicontroller, sometimes NOT directly, through other circuits.
, it depends on what was damaged, what kind of model. The guarantee for such work is issued.
Go to the laptop repair page or call us to consult.
|HP||2500||Week 1||week is laid for diagnostics|
|Apple||8000||2 weeks||replacement of SMC from donor|
|Asus, Acer, Lenovo, etc.||2000||1 week||a week is set for diagnostics|
Other malfunction options
Power button malfunction
In old laptops, the contact of the power button often oxidizes, it is enough to find this malfunction, replace the button, and everything will work. Operation Takes no pain in a couple of hours, it does not cost one and a half thousand rubles.
The laptop has a black screen, but the coolers start
One of the varieties of the problem is when, after booting the system, nothing is displayed except the cursor on a black background. This happens on old laptops and may be due to too old BIOS version of the motherboard. Why does this situation arise:
Windows 10 or other modern next-generation operating system automatically downloaded and installed new drivers for the graphics card;
power control circuitry embedded in THESE new drivers, and is not able to function normally together with the resources of the motherboard, which remained old;
when the device is started, the monitor cannot fully display the image, although everything else works fine. the sound of the system startup is heard, the coolers are noisy, the power indicator is on.
As a result, all the user can see is a black screen and a cursor on it. If you have an older Acer or Asus laptop, you can try closing and lifting the lid, often enough for the picture to appear. But your best bet is to update your BIOS firmware. To do this, go to the official website of the laptop manufacturer, find the “Files”, “Downloads” or “Support” section, and then download the appropriate update file. It always comes with step-by-step installation instructions.
Why is the laptop screen black?
When turning on the laptop, a black screen may appear for software or hardware reasons. The users themselves, especially if they are a beginner, cannot always solve the problem, so we have prepared material designed to help with this. And if you prefer to trust specialists, then contact our company for laptop repair.
Additional methods for solving the problem
It is worth mentioning in the article a few more methods, which are considered extreme measures. They have to be resorted to extremely rarely, but this does not lead NOT to tell about them.
You can check the operation of the laptop hardware at the time of boot with the introduction of POST. a special card for self-testing. Its purpose is to determine the reason for stopping the download or the normal operation of any components, including the screen. POST cards are available for laptops, which can be connected to USB or minIPCI connectors.
When the card is connected, when the device is turned on, codes will be displayed on its screen, each of which signals which component is being checked at the current time. As soon as a problem is encountered, POST displays information about it on the screen and stops working. From the instructions that came with the card, you can find out the decoding of the codes.
What to do if the laptop screen is black but it works
If the laptop is noisy, the lights are on, but the display is NOT lit, then you can try to reset the settings according to these instructions:
Disconnect the device from the mains, remove the battery and hold down the start button for twenty seconds.
Reinstall the battery, connect the power supply.
Turn on the device in standard mode. After that, the settings should be reset.
If it does not help, then it is reasonable to check the display for performance. Such a check has already been described above: you need to connect another output device (monitor, TV) through the HDMI, DVI or VGA port. If the image is displayed on it, then the loop or backlight problems are obvious.
You can also disconnect all external devices from the device. mouse, flash drives, additional keyboard, headphones, modems, and so on. Probably, one of them conflicts and gives the indicated problem.
What to do if the laptop does not turn on and a black screen is on
The main possible causes of this problem:
Mechanical damage to the device.
Liquid spills on internal components and contacts.
Inadequate cooling resulting in overheating.
RAM memory problems.
Incorrect component settings.
Damage to the display and related parts (matrix, loop).
Graphics accelerator issues causing black screen on laptop.
Many of these problems can be fixed at home with your own hands, but some are best left to professionals.
After turning on the black screen on the laptop. what to do
If, after starting the device, the indicators are on properly, the system boots, but suddenly at some stage a black screen appears, then the reason is most likely hardware-based and related to the battery. If the battery has failed, if there is a chance to partially restore it by applying a sawtooth voltage, but this is a difficult method. Easier to buy a new battery.
This problem is often faced by owners of fairly old devices in which the battery is no longer able to fully hold a charge. If your laptop Lenovo, Acer or another brand is still new, then you should try to reinstall the system or immediately take the device to a service point.
The first thing to check is whether the device’s power plug is tight enough and whether the wire is damaged by bending, and whether the battery is charged. Surprisingly, such simple problems often confuse users. If everything is in order, then check the following aspects point by point:
Battery performance. Connect the power to the laptop. The indicator should light up, notifying that the battery is charging. If it does not light up, then remove the battery and, using an eraser, clean the contacts on the laptop and on the battery, if there is a semblance of plaque or oxidation on them. Then use up the remaining charge by holding down the power activation button. Insert the battery and try turning on the device. If it does not turn on, then it is likely that the battery is out of order.
The ramps may become unusable due to, for example, liquid spilled on the keyboard. Then a black screen appears on the laptop. To check the RAM, you need to disconnect the laptop from the network, remove the battery, Unscrew the bolts from the cover under which the memory is installed. Remove the modules and use the same eraser to clean the contacts. Put everything back and try to turn on the device.
Next, you need to check the system. Check that the ribbon cable, which connects the card or motherboard to the graphics matrix, is working properly. To do this, you can connect a TV or a regular monitor to your laptop via HDMI or older VGA, DVI. If an image appears on another output device, then the problem is definitely in the backlight of the laptop’s display. Only a specialist can replace it, this is a difficult task.
Also, a black screen on a laptop can mean problems with the operating system or drivers. Often, returning to a previous system restore point, resetting it (in the case of using Windows 10), or a complete reinstallation helps. Finally, you can try resetting your BIOS settings. This is done blindly, because the laptop turns on, but the screen is black. Press the power button, then several times the key to start the BIOS. After a few seconds, press F9 to reset the settings, then F10 to exit and Enter to save. Depending on which laptop model you have (HP, Lenovo, Asus, Acer, etc.), the aLGorithm may be slightly different. you need to press the right or left arrow to select Yes or press the Y button to confirm. You can find out which button gives access to the BIOS from the instructions for a specific device.
Why the laptop won’t turn on (black screen) but the lights are on
The main groups of reasons why such a problem may appear:
Damage to the south or north bridge of the motherboard due to overheating or mechanical stress.
Broken graphics card or processor.
Breakage or loss of RAM.
Problems with the hardware settings of the device.
Defective loops responsible for connecting the laptop matrix with the screen elements.
At some points you cannot do without replacing parts, and at some you can do it yourself. clean the fans from dust, eliminate Possible obstacles to air exhaust from internal components.
Replacement of spare parts
If the POST-card is not available, but there are spare computer elements, then try replacing the one installed in the laptop with equivalent ones. Attention: do this only if you have a clear idea of how the laptop works, otherwise you can completely break it.
Change one element at a time and try to turn on the device. For example, RAM, hard drive, and so on.
The laptop does not turn on and the power indicator is off. What to do ? Does not turn on with battery
Due to incorrect use of the battery, it soon became faulty.
This was due to the fact that I used the laptop most often from the mains, but the battery was always inserted. Manufacturers recommend removing the battery after a full charge if the laptop will be used from the mains.
This is because laptop batteries are designed for a limited number of charge / discharge cycles.
In other words, sooner or later they will fail. Most often it starts with the laptop discharging faster, and then stops charging completely, i.e. the icon in the taskbar indicates that it is, say, 80% charged and is NOT charging.
This means that its maximum volume has decreased, which means that it will not be able to work as before. In my case, this is how it all started, and then I noticed that if I turn on the laptop from the mains, but with the battery inserted, then It did not start, and sometimes it started, but for a very long time.
If you are faced with such a problem, then first of all you need to make sure that the battery is working.
Battery check and calibration
Calibration allows you to more or less accurately determine the charge / discharge level of the laptop battery.
As a result, the battery is used more efficiently.
For nickel-cadmium (Ni-Cd) and nickel-metal hydride (Ni-MH) batteries, calibration is one of the ways to combat the “memory effect”. Usually indicated on the battery itself. Take a look now and write a comment, which one you have.
Black screen: laptop does not turn on and the power indicator does not light or does not turn on with battery, but is working normally from the mains (problem solving)
Good afternoon, dear readers!
In this article, we will analyze the problem that the laptop does not turn on and the power indicator does not light, as well as the problem when it does not work (or slows down) with the battery, but it works normally from the network.
I want to say that I have already encountered both problems, not only in theory, but also in practice.
And let’s sort it out in order, Possible problems, and solutions. And besides this, we recommend that you Read other similar articles.
In case you have special cases, then ask in the comments below. they will help you. Also, we would be grateful if you share this article with others by clicking the social buttons. networks. thanks!
We solve the problem with turning on the laptop
Read also other helpful articles:
We check the laptop to turn on with and without a battery. We look at the power indicator
To do this, do the following:
First, remove the battery and check if there is any damage to the contacts, and then remove all USB devices.
Second, after making sure the battery is NOT damaged, plug it back in and connect to the mains. Leave the laptop turned off while charging. In this case, the indicator on the laptop should light up, indicating that charging is in progress.
Third, turn on the laptop with only the battery. If it turns on, the battery is working, but you need to check it.
Let’s take a look at how the battery is calibrated
If your laptop provides battery calibration using the BIOS Setup utility, be sure to use it.
Let’s take a look at the battery calibration process using the example of an HP laptop:
To check the battery Use the following procedure:
Press and hold the power button for five seconds to turn off the computer.
From the main menu, select Component Tests.
From the list of component tests, select Battery.
In the battery test area, select Run once.
Battery test starts.
After the test is complete, the first line of the battery test page displays its status.
Based on the data received, it will be necessary to make a decision: what to do with the battery, if everything went well, perhaps the laptop will continue to work, if not, then it is worth trying to connect another battery, if available.
If the laptop does not turn on with another battery, you may have to contact the service center to replace the motherboard.
First of all, check the AC adapter and cord for damage, grains or breaks, etc.
If you DO NOT find any signs of damage, you need to disassemble the laptop.
Remove the upper case and then check the power cable from the motherboard and from the power button, if damaged, do as follows.
After you disconnect it, check its integrity, it may be that at the attachment points it could bend and the contacts came off the loop.
In this case, detach the sealing tab, it will still come in handy.
Then you need to cut off a small part of the cable, but be careful not to cut too much, otherwise the cable will NOT be long enough for a reliable connection.
Having cut off the excess, take a knife, scalpel or something sharp, and then carefully strip the contacts on the right side to about the same length as on the cut off faulty piece of the train.
After that, plug back in and insert the sealing tab from the top and fix.
If the cable is intact and cannot be interrupted anywhere, check the power connector and its connection to the motherboard.
Also check for physical damage and if it is well connected. If anything is damaged, you will need to contact the service center for replacement.
Such problems are always associated with power adapters or batteries, and therefore, they must be replaced.
I hope this article will help you diagnose the problem with your laptop.
The basis that affects the operation of the device as a whole is its motherboard. If any of the components fails, the laptop may show signs of life. at least the morgue with indicators or the cooler will make noise. With a serious stripe on the motherboard, the device becomes “dead” and does NOT show signs of life at all.
Replacement of this part is not always required. Often it is enough to solder a pair of capacitors or the unit is more difficult. for example, to replace the chip, which is called the “North Bridge”.
Other problems when a Lenovo laptop displays a black screen include:
- Do not allow peripheral devices connected via USB ports to turn on normally.
- Monitor backlight LEDs are burnt out, so images are present.
- The cable is broken and there is no connection between the adapter and the monitor.
What can be done at home
Another reason why the laptop may NOT turn on is the lack of contact between the motherboard and the RAM. In this case, the cooler will work and the LEDs will be on, but even the motherboard splash screen will NOT start and you will see a black screen.
In this case, you will need to disassemble the laptop. ALGorithm of actions:
- Disconnect the power supply and remove the battery.
- Using a Phillips screwdriver Unscrew the screws on the bottom cover, including the battery compartment. Some of them may be hidden under stickers or laptop legs.
- Gently pry off and remove the plastic keyboard cover that protects the buttons.
- Dismantle the keyboard, pressed with a pair of slotted screwdrivers on the special grooves on the side of the monitor. Disconnect the keyboard cable from the motherboard.
- Using a Phillips screwdriver Unscrew all the screws that you see. Remove optical drive.
- Remove the bottom cover. Disconnect the components that prevent you from reaching the RAM bar.
In laptops, RAM is NOT larger than a pair of matchboxes stacked together. It looks like a PCB with several chips on it. This component is inserted into a slot parallel to the mother chamber in the lower part, from the side of the lower cover. You can use an eraser or rubbing alcohol to clean the RAM contacts.
And since you have disassembled the laptop, clean it from dust at the same time. Being a current conductor, it can be a prerequisite for a short circuit and prevent the device from turning on. Blow out all the “insides” of the computer, using a household hairdryer, vacuum cleaner or a can of compressed air.
It is not recommended to install metal nozzles. only plastic ones. When metal comes into contact with electronic components, static electricity breakdown and failure of expensive parts are possible.
Black screen at startup, coolers work, but no indicators
The reason for this situation is often a banal glitch. In this case, it is enough to turn off the power supply and remove the battery for a few seconds. After turning on, the laptop will most likely start as usual.
The second, less common reason is that the BIOS settings are lost and the laptop cannot correctly determine the connected equipment. In this case, you will have to reset the settings “blindly”, since there is an image on the screen. Although it is NOT excluded that when the BIOS interface is turned on, the picture will appear.
To switch to this mode after restarting the computer, press the F2, F8, Escape or Delete button several times (which one depends on the model of the motherboard and the BIOS version embedded in it). After you hear a light click, press the F9 button to reset the BIOS settings, and then F9 to save the changes and restart the device.
Black screen at startup, but lights come on
The reason is most likely that there is no image on the screen. As mentioned above, this is either a burned out LEDs in the matrix backlight, or a worn loop that connects the graphics adapter and the display. If the problem is in the loop, then usually when the angle of inclination of the top cover is changed, the image on the display may appear briefly.
A broken cable can be replaced, including by yourself. Usually a laptop is assembled according to a modular scheme: both on the motherboard and on the matrix there are slots where the ribbon cable is connected. The most difficult thing is to get a suitable train, especially if the laptop was released several years ago.
Burnt-out LEDs are not as minor damage as it might seem. The point is that they do not change: the entire matrix must be replaced. This is a little expensive, since its cost can be up to a third of the device, even if you find used components.
You can also connect an external monitor or TV via the HDMI port, which is found in any modern laptop. If there is an image on the external display, then there is a problem with the laptop screen. If there is an image, one of the possible problems may be a breakdown of the card, which because of this does not give a picture.
In this case, the following can be noted:
- Graphics adapter drivers are missing or not working correctly, therefore images are present.
- Incorrect BIOS settings, due to which the motherboard does not detect a piece of hardware.
You can fix such problems yourself
The following nodes can be source of trouble:
- The outlet where you plug the laptop power adapter.
- The power supply itself, not charging the battery.
- Battery power controller, not supplying voltage to cells.
- Depleted cells that no longer take charge.
- Power button, not allowing the device to turn on.
If you cannot fix the problem yourself, you need to contact a specialist.
What to do with black screen when turning on Lenovo laptop
If the Lenovo laptop does not turn on. a black screen or crashes into blue, and the power key does not work, there are other problems, you do not always need to contact the service center. Sometimes, simple user actions are required to turn on a Lenovo laptop and make it work. This guide will show you what to do if your Lenovo laptop won’t turn on and what diagnostic and repair methods you can use.
Instructions for diagnosing power problems
The first thing to check is the outlet where you usually plug the laptop power adapter. Plug in any other device here to determine if it works.
It is better to use a multimeter to test the power supply. The red pin must be inserted inside the laptop plug, where there is a connector for a similar pin in the device case. Black pin Lean against the outside of the connector. The operating voltage of the power supply is usually 15 to 20 volts. You can also use a similar power adapter. If at the same time the LED on the laptop lights up, indicating that the battery is charging, then the problem is in the adapter.
And another reason that the laptop does NOT start may be trivial. the owner simply forgot to charge the battery. Try to charge the device and turn it on after a couple of hours. Cleaning the contacts with an eraser can also help. both on the battery itself and on the laptop.
If the laptop does NOT react at all to pressing the power button, then most likely it was she who broke. An inoperative laptop, when trying to start, should at least emit at least a faint click. You can try to fix the button, but for this you already need to tear apart the laptop. The design of this part is primitive, so the best repair option is to completely replace it: if something inside is physically broken, it is no longer possible to fix it.
The main problems with turning on the laptop
They can be divided into 3 groups. related to the hardware part of the device, power supply and software.