What causes a white screen when the computer starts up?

Reasons for a white screen when the computer starts up: 1. There is a problem with the LCD panel of the monitor, and the monitor needs to be replaced; 2. A graphics card problem causes the monitor to light up but no picture is displayed after the computer is turned on, and the graphics card needs to be replaced; 3. . The running memory is not loaded enough. To put it bluntly, the capacity of the computer memory module is small, or there is a virus in the computer, and the virus program occupies the memory resources; 4. The memory module is loose; 5. The monitor has poor heat dissipation; 6. There is a lot of dust in the machine; 7. , LCD screen is damaged; 8. Screen line failure.

The operating environment of this tutorial: Windows 7 system, Dell G3 computer.

I believe that everyone will encounter a white screen on the monitor when using a computer. So what is a white screen on the computer? A white screen on a computer is a problem in which the LCD screen displays a completely white screen after it is turned on. What causes a white screen when the computer starts up? How to solve it? Let’s find out below.

There are many reasons for a white screen when the computer starts up, such as: display problems, graphics card problems, insufficient loading of running memory, loose memory modules, poor heat dissipation of the monitor, too much dust in the machine, damaged screen cables or LCD screens , screen line failure, LCD panel drive circuit problem, LCD panel power supply circuit problem, screen line poor contact, motherboard control circuit problem, graphics card or video cable poor contact or damage, etc.

Monitor failure

If there is a problem with the LCD panel of the monitor, it will cause a white screen to appear when turning on the computer. In this case, you can try and replace other monitors. Is it normal? If it is confirmed that the problem is with the monitor, you need to replace it with a good monitor first and send the bad monitor to a repair shop for repair. Usually monitor faults are easy to troubleshoot.

Graphics card problem

If the monitor is on but no picture is displayed after the computer is turned on, the graphics card is more likely to be faulty. You can turn off the computer and then disassemble the case. And remove the graphics card, and then use an eraser to wipe the gold finger part to remove the oxidized part and reinstall it and start the computer. Generally, it can return to normal. If the problem is not solved, the graphics card needs to be replaced, because it may mean that the graphics card is damaged.

Insufficient loading of running memory

A white screen failure on the computer is generally the result of insufficient loading of running memory. To put it bluntly, the capacity of the computer memory module is small, or There is a virus in the computer, and the virus program has occupied memory resources.

The memory module is loose

The memory module is loose, unplug the memory, clean the slot, wipe the memory gold finger, and then insert it tightly. If there is a problem with the quality of the memory module, replace the faulty memory and increase the virtual memory value.

Poor monitor heat dissipation

After the computer has been operated for a long time, the heat dissipation of the computer is insufficient and a white screen appears.

There is too much dust in the machine

There is too much dust in the machine and poor contact. Clean the chassis and plug all the connections tightly.

LCD screen damage

The white screen that keeps turning on is mostly caused by damage to the LCD screen. Replacing the LCD screen can solve the problem. Sometimes the screen damage is not too serious and can be repaired directly.

Screen cable failure

A white screen appears when moving the notebook or opening and closing the screen. This white screen is mostly due to a fault in the screen cable. During the opening and closing process of the screen The screen wire was disconnected at the virtual connection point, the screen's power supply voltage did not come up, the image could not be displayed, and there was only a white backlight. The reason was that the screen wire was worn and broken.

Solution

First disassemble the casing of the LCD display, and then check whether the screen cable interface is loose or not connected properly . After checking, the screen cable connection is normal.

Then turn on the power switch of the laptop, and then use a multimeter to measure whether the power supply voltage of the screen cable interface is normal.

Check whether the fuse resistor or fuse inductor near the output end of the screen cable is open circuit or damaged. If it is damaged, just replace the damaged components.

If the fuse resistor or fuse inductor near the output end of the screen cable is normal, then check the DC-DC power supply for the LCD display.

If the output voltage is abnormal, check the fuse resistor, PWM, controller, switch tube, inductor coil, filter capacitor and other components in the power circuit, and then replace the damaged components.

If there are damaged capacitors and other components between the output end of the DC-DC voltage conversion circuit and the screen line interface, just check and replace the damaged components.

If the power supply voltage of the screen line interface is normal, then check whether the timing signals and drive signals in the LCD panel drive circuit are normal. If not, check the output signal and input signal of the chip that generates this signal respectively. and supply voltage to determine whether the driver chip is damaged. If damaged, just replace it.

If the monitor, power supply and CPU work for too long, it will cause a crash. Dust and oil the fan, or replace the fan. For desktop computers, add a temporary fan to the host chassis to assist in heat dissipation.

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