There are many reasons for a black screen on a laptop. The most important ones are a damaged display and a damaged motherboard. Of course, a black screen is a common phenomenon. If your laptop is used for a long time, it will cause damage to the graphics card, poor contact, parts that cannot be displayed due to high temperatures, or artificial damage to the computer. Therefore, Only then will the computer screen go black. This phenomenon is not terrible, and there are many ways to restore your computer to its original state.
Why does the screen suddenly go black while using the computer?
First check whether the contact is good. You can separately check whether the contact between the graphics card and the monitor is good, and whether the contact between the graphics card and the motherboard I/O slot is good. If necessary, remove it and reinstall it to ensure that it is installed in place and the contact is good.
If there is no problem with the contact, it is best to try another monitor to make sure there is no problem with the monitor. If there is no problem with the monitor, check whether the CPU fan is running. If it is running, use a multimeter to measure whether the voltage output is normal ±12V, ±15V. If it is not normal, you can try another power supply.
If a black screen still appears, remove the components installed in the computer and leave only the CPU, graphics card, and memory module. This will limit the cause of the fault to the CPU, motherboard, and memory. Generally, if there is a memory failure, there should be an alarm sound. If the memory failure is eliminated, only the CPU and motherboard are left.
Replace with a normal CPU (should be compatible with the computer being tested), turn on the computer and test again. If a black screen still appears, you can only change the motherboard. The problem should also appear on the motherboard. superior. Computer black screen failure may indicate that there is a more serious problem with the computer. You may wish to troubleshoot it according to the above methods when a black screen occurs. During the processing process, elimination and replacement methods should be flexibly applied to eliminate and deal with the phenomenon that occurs at the right time
1. When the monitor has a black screen and no image is displayed (however, the monitors currently on the market do not respond when the host does not send a signal. , the screen will display "No signal cable connection"), first check whether the host power supply is plugged in well, and whether the fan of the power supply is rotating? The power indicator on the host panelAre the lights and hard disk indicator lights flashing? Because if the host power supply is not working or the motherboard is not powered, and the monitor does not receive a signal, of course there will be no image display.
2. Check again whether the power supply of the monitor is plugged in well? If the power switch of your monitor is a touch switch, you should hear a slight "pop" when you power on the monitor. If there is a sound, it can be judged that the switching power supply circuit of the monitor is good. Is the power switch of the monitor turned on? Is the power indicator light of the monitor on? When you approach the monitor screen with your hand and move it slowly, is there a "hissing" sound and a feeling of the hair on your hands being sucked up? This is Check whether the high-voltage circuit of the monitor is working properly.
3. If it is determined that the monitor has been powered on and high voltage is generated, continue to check whether the data cable connector of the monitor and the signal output interface of the graphics card are in good contact? Is there any looseness? Unplug the plug again and check to see if there are bent or broken pins or a lot of dirt in the D-type connector. This is a problem that many users often encounter. When connecting the D-type socket, the force is uneven, or the fixing screws of the interface are forgotten to tighten, causing the interface to loosen and cause poor contact, or the D-type socket is damaged due to improper installation methods or excessive force. There are broken or bent needles in the interface, causing poor contact.
Note: The 15-pin pin of the monitor’s data cable plug may have missing pins, such as pins 4, 9, and 11. This is normal. Do not artificially use other metal wires to supplement these missing pins. bit to avoid causing other malfunctions.
Let me say a little more: Pins 1, 2, and 3 are red, green, and blue signal inputs. If any pin is not in good contact, the screen will lack the corresponding color.
If there is a problem with pins 12 and 15, the host cannot find the corresponding monitor, but this does not affect the use.
If there is a problem with pins 13 and 14, a black screen will appear on the monitor, and the indicator light on the monitor will change from green to orange after a while of turning on the computer. One of the above-mentioned black screens appears.
4. Open the case and check whether the display card is installed correctly? Is it in good contact with the motherboard slot? Is the graphics card or slot accumulated too much dust due to long use? Is it causing poor contact? Is there any trace of burning or cracking on the chip on the graphics card? When the screen is black due to the graphics card, there will be a short and four long beeps during the computer's power-on self-check. There will be a beep sound prompt. When installing the graphics card, hold the upper part of the graphics card with your hand and insert it into the card slot evenly so that the fixing screw port of the graphics card matches the screw port of the main chassis. Do not forcefully fix it if it is not inserted properly. Cause the graphics card to twist. If you confirm that the installation is correct, you can remove the graphics card and wipe the gold finger of the pin with an alcohol cotton ball or install it in another slot (only for PCI graphics cards). If it still doesn't work, you can only replace it. Try a good graphics card.
If it still doesn’t work, it’s best to check the compatibility between the graphics card and the motherboard when making sure the graphics card is in good condition.
5. Check whether other boards (including sound cards, decompression cards, and video capture cards) are in good contact with the motherboard slots. Pay attention to check whether the hard disk data cable and the hard disk power cable are connected correctly. Make sure to replace the slots of other boards and clean the pins. Many people tend to overlook this. It is generally believed that the black screen on the computer is caused by the monitor and graphics card and has nothing to do with other devices. In fact, it is caused by incorrect installation of the sound card and other equipment. It is difficult to initialize the system, especially if the hard disk data cable and hard disk power cable are plugged in incorrectly, which may easily cause a no-display failure.
6. Check whether the memory module is in good contact with the motherboard? Re-insert and unplug the memory module or try another slot, or replace the memory module with a new one. There is a problem, the computer is starting
7. Check whether the CPU is in good contact with the CPU socket on the motherboard? Due to movement or other factors. Connect the CPU to the SLOT1 socket or Socke370 The socket has poor contact. It is best to press the CPU with your hand or remove it and reinstall it.
8. Check the CPU FSB, frequency multiplier, and memory frequency.Are the jumpers or settings in CMOS correct? Check the relevant jumpers one by one according to the motherboard manual. The order is "CPU FSB jumper - CPU multiplier jumper - memory frequency jumper".
9. Check whether the CPU voltage is set appropriately. Be careful when setting the CPU voltage jumper to match the CPU's operating voltage. Steps 8 and 9 should be carefully checked when a black screen appears for some assemblers or users who like to overclock.
10. Check whether the CMOS parameter settings are correct. If your computer is equipped with two graphics cards and you set the first initialized PCI graphics card in CMOS, and your only monitor is connected to the AGP graphics card, of course the monitor will not light up.
Sometimes the power supply of our host is damaged and cannot be connected to the power normally, so a black screen will occur. If computer accessories are used for a long time, a black screen will occur. Excessive overclocking can also cause a black screen. It will cause a black screen, so you have to stay the same to cope with the changes. No matter what kind of black screen it is, you must find a way to correct it. The easiest way to correct it is to unplug the power supply, then turn it on to see if it can be used normally. If the letters still cannot be displayed, you need to take special measures to repair your laptop.