Help, the computer screen is black again, it s a very depressing question, which master will support

No, it was sent to the maintenance department for testing and nothing was detected, and the blue screen started two days ago. I have made the system three times in three months after I bought it, I went to Lenovo to take a look, and many people complained that this machine has a serious problem of blue screen and black screen, and they asked for a recall.

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What you said is not too clear, based on my personal experience in repairing computers for many years, I will briefly analyze it:

1.If the display flickers and goes to sleep, sometimes it's good, it's usually a problem with the graphics card, it can be a driver problem, reinstall the driver or update to the latest driver, or it may be a hardware problem with the graphics card, and you need to find a similar graphics card to replace it for testing.

2.The second possibility will be a problem with the CPU, memory or motherboard, plug it back in, if it doesn't work, you have to test it one by one by replacing it, and you can generally find out where the problem is.

Don't rush, just take your time!

Is it that the power supply of the monitor is not forked? Or call the ** merchant who sells computers. Don't do it yourself. If the warranty is over. See if the fan is pregnant. Or maybe it's too much ash to brush the fan down.

The temperature is normal, so let's check something else.

I guess there is a problem with the graphics card, go to the service station and let him check it for you! Generally, the black screen is a problem with the graphics card, it shouldn't be too high, it's winter!

In general, there may be several reasons for this failure phenomenon: physical damage to the internal memory of the video memory; There is a problem with the graphics card BIOS; The graphics card was overclocked; The PCB board is not in good contact with the components. With the above ideas in mind, it's time to start troubleshooting.

First of all, the video memory was inspected, and the four video memory chips and peripheral components were carefully observed and tested, and no false soldering and damage characteristics (such as bursting, discoloration, desoldering, short circuit, etc.) were found. Then flash the graphics card BIOS to the normal public BIOS, and then install the graphics card for testing, and when the fault occurs, touch the main chips on the graphics card with your hands, and no chip temperature increases. This excludes the possibility of a problem with the graphics card BIOS and a corrupted video memory. There is no jumper on the PCB board of the graphics card about overclocking, and it is found that the graphics card is not overclocked, which excludes the possibility of failure caused by overclocking of the graphics card.

It seems that the graphics card PCB board may be in poor contact with a certain component. Observe and measure the components that may generate a lot of heat on the graphics card, when the main chip SIS6326 is detected, it is found that there are two pins in the lower left foot of the chip (facing the chip) and the PCB board are in poor contact, gently break the PCB board, hear a slight "pop" sound, and then observe the SIS6326 chip, and find that there are 9 pins in this position and the PCB board are desoldered, a total of 11, and the other pins are soldered normally, which should be the cause of the failure!

Knowing the cause of the failure makes it much easier to deal with it. Use a well-grounded pointed 25W internal thermoelectric soldering iron with a finger grounding ring and repair soldering. First use rosin and alcohol solution to gently smear the desoldering pins and PCB board, then solder the desoldering pins, install the graphics card back to the computer for testing, run for a long time without the phenomenon of blurred screen, troubleshooting! .

First determine whether it is a host or display problem,Look at the black screen after the keyboard can also control the light of the keypad,If you can control it,It may be a display problem,The temperature of the display high-voltage plate is too high or the screen may be black,If you are sure that the display is okay,Just re-try the system,Then further determine whether it is caused by hardware。

It's not the power supply or the motherboard, if you don't have a multimeter, take it to repair, the graphics card will not appear to be able to play and crash if there is a problem, you can't turn on the machine if it's broken, the hard disk will only be broken and it won't be able to turn on or it can be turned on, but it will be stuck, the blue screen won't be black, the motherboard can be turned on if it's bad, but it will often be blue screen and black screen, the power supply is bad, and it can't be turned on or turned off after it is turned on.

The black screen is caused by the overheating of the graphics card, and there is no good way to solve it, just change the computer!

The voltage is unstable, is it sometimes a sudden black screen, sometimes it's fine?