What is the reason for the white screen of the computer LCD monitor? The solution to the white screen of the computer LCD monitor [detailed]

In the process of using the computer, you will encounter black screen, blue screen, and blurred screen. Friends who often use the computer will not be unfamiliar with it. In fact, there is an uncommon white screen phenomenon. Maybe some users have encountered it before. The white screen of the monitor mainly appears on some monitors that have been used for a long time. What to do with the white screen of the computer LCD monitor? How to solve it? The following editor will introduce the solution to the white screen of the LCD monitor for your reference.

1. Reasons for the white screen of the LCD:

1. The white LCD screen may be caused by poor contact or damage to the graphics card or video cable.

2. The internal problems of the display mainly include: LCD panel drive circuit problems, LCD panel power supply circuit problems, poor screen cable contact, motherboard control circuit problems and other problems.

Since the LCD screen is blank after booting, it indicates that the backlight and the high-voltage generating circuit are working normally, but the LCD panel does not get a driving signal. If the screen disappears after the computer shuts down, and then the screen goes blank again, it may be caused by a problem with the power board.

3. From the analysis of the failure phenomenon, no matter whether the LCD screen is turned on or off, as long as the power is plugged in, the high-voltage generating circuit is always in working condition, and the backlight is always lit. In other words, the high-voltage generating circuit is no longer controlled by the switch, that is, the switching signal sent by the main board to the high-voltage generating circuit is out of control. Since the switch signal sent by the microprocessor of the main board generally needs to be controlled by several transistors, the fault may be the damage of the transistor that controls the switch signal.

2. Solutions and maintenance ideas for the white screen of the LCD display:

First, rule out whether it is a graphics card problem or a VGA line problem. You can replace a VGA line to see if the screen is still white. If the screen is still white, it is a problem with the host computer, most of which is a poor connection or malfunction of the graphics card, but this rarely happens. The following is a detailed description of the solutions to the white screen phenomenon caused by poor display:

1. First disassemble the shell of the LCD screen, and then check whether the screen cable interface is loose or not connected properly. After checking the screen cable connection is normal, proceed to the next step.

2. Turn on the power switch of the computer, and then use a multimeter to measure whether the power supply voltage of the screen line interface is normal. If the power 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 terminal of the screen line is open or damaged. If there is any damage, replace the damaged components.

3. If the fuse resistance or fuse inductance near the output terminal of the screen line is normal, then check whether the output terminal voltage of the DC-DC voltage conversion circuit that supplies power to the 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 the power circuit, and then replace the damaged components.

4. If the voltage at the output terminal of the DC-DC voltage conversion circuit is normal, there are damaged capacitors and other components between the output terminal of the DC-DC voltage conversion circuit and the screen line interface. Check and replace the damaged components.

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

The maintenance of the white screen of the LCD monitor is not as easy as the black screen or blue screen of the monitor. You need to master some knowledge about the circuit of the monitor. It is best to send the monitor to a professional organization like Xunwei Quick Repair and ask professional monitor maintenance personnel to do it. Overhaul. In fact, when you encounter a fault with the white screen of the LCD, don’t think that the monitor is broken and has not been repaired. Sometimes the fault is simple and easy to repair. After the maintenance personnel have checked and repaired, it is not too late to sentence it to the death penalty.