What s going on with a white screen on your computer?

The cause of the failure of the white screen of the power-on display.

The white screen failure of the LCD LCD display may be caused by the LCD panel drive circuit problem, the LCD panel power supply circuit problem, the screen wire contact poorly, the motherboard control circuit problem, etc. Since the LCD screen is white after turning on, it means that the backlight and high-voltage generation circuit are working normally, but the LCD panel does not get the driving signal. If the screen disappears after the laptop is turned off, and then the screen is white again, it may be caused by a problem with the power strip.

From the analysis of fault phenomena, no matter whether the LCD LCD is turned on or off, as long as the power supply is plugged in, the high-voltage generating circuit is always in working state, and the backlight is always lit. In other words, the high-voltage generation circuit is no longer controlled by the switch, that is, the switching signal sent by the motherboard to the high-voltage generation circuit is out of control. Since the switching signal emitted by the motherboard microprocessor is generally controlled by several transistors, the fault may be a damage to the triode that controls the switching signal.

Fault repair ideas for the white screen of the boot display.

1. First disassemble the shell of the LCD display, and then check whether the screen cable interface is loose or not connected. After checking, the screen cable is connected normally.

2. 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. If the supply voltage is normal, go to step 5; If it is not normal, then check whether the fuse resistor or fuse inductor near the output of the screen cable is open or damaged. If it is damaged, the damaged component can be replaced.

3. If the fuse resistor or fuse inductance near the output end of the screen cable is normal, then check whether the output voltage of the DC-DC voltage conversion circuit supplying power to the LCD LCD screen is normal. If the output voltage is abnormal, check the fuse resistor, PWM controller, switch tube, inductance coil, filter capacitor and other components in this power supply circuit, and then replace the damaged components.

4. If the voltage at the output end of the DC-DC voltage conversion circuit is normal, there are damaged capacitors and other components between the output end of the DC-DC voltage conversion circuit and the screen cable interface, and the damaged components can be checked and replaced.

5. If the power supply voltage of the screen cable interface is normal, then check whether the timing signal and driving signal in the LCD panel drive circuit are normal. If it is abnormal, check the output signal, input signal and power supply voltage of the chip that generates this signal respectively to determine whether the driver chip is damaged. If it is damaged, it can be replaced.

The maintenance of the white screen of the display screen is not as easy as the black screen of the display screen, and it is necessary to master some knowledge of the circuit of the display screen, and it is best to ask professional display maintenance personnel to overhaul it.

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The monitor data cable is plugged in.

Causes and solutions for white screen when computer boots:

1) First of all: Before doing it, check whether the connection between the host and the graphics card is loose, and re-plug it, sometimes this will also cause a white screen.

b) There are two main reasons for the white screen of the computer to boot up:

The first reason is that the slot between the graphics card and the motherboard is not fully contacted, resulting in the white screen phenomenon, as long as the power is turned off, the chassis is opened, the graphics card is taken out, and the eraser is aimed at the gold finger to wipe it a few times, and then reinstall it back, sometimes it is handled like this, and it is good to reboot the computer, if it is not good to deal with it in this way, the performance of the main chip of the graphics card is reduced, and the video memory is soldered, which leads to the white screen of the display, and the graphics card is repaired or replaced, <>

The second reason, which is the problem of the LCD screen, generally occurs because of the phenomenon of bulging and discharging of the filter capacitor at the output end of the power supply circuit, leakage, and insufficient power supply of the driver board circuit, virtual soldering of the MCU core and the main chip, poor contact of the screen line, and the main chip of the screen circuit is soldering, insufficient power supply, or damage, and the horizontal or hard line caused by it, and it may be that the power supply insurance of the LCD circuit is damaged, which will cause the white screen phenomenon. Solution:

Jianyi sent after-sales or LCD maintenance department to repair the display, of which the screen line is most likely to have poor contact, <>

3) Detection method: The judgment of this phenomenon is to borrow someone else's good monitor to try it, and you can see the operating system, which means that there is a problem with the display, if you can't see the system, someone else's display is also a white screen, this is the problem of the graphics card, and you can replace the graphics card.

Computer: Product name: ASUS.

Product model: ASUSU4700I

System version: Windows 10

Software version: null

1.Poor or faulty graphics card contact will cause a white screen on the computer, just check the graphics card or replace it with a new one.

2.Loose memory modules will also cause a white screen on the computer, so you can pull out the memory module, clean the slot, clean the memory module, and then plug it back in.

4.Problems with the LCD panel drive circuit and LCD panel power supply circuit will cause the computer to be white, and we need to take it to a professional maintenance point for repair.

Summary. 1.Poor or faulty graphics card contact can cause a white screen on your computer.

2.Loose memory modules can also cause a white screen on your computer.

4.Problems with the LCD panel driver circuit.