LCD liquid crystal screen is a kind of display screen widely used in modern electronic products. Sometimes the LCD screen will appear dark, which brings great inconvenience to users. This article will introduce the method of repairing the dark LCD screen from four aspects.

1. Check the backlight

The brightness of the LCD liquid crystal screen is provided by the backlight. If the backlight fails, it will cause the LCD screen to go dark. The first step is to check that the backlight is working properly. You can use a flashlight to illuminate the LCD screen. If the screen becomes brighter, it means that the backlight has failed. At this point the backlight needs to be replaced.

If the backlight is not faulty, you can try to adjust the brightness of the LCD screen. In Windows system, you can adjust the screen brightness through "Display Settings". If the problem still cannot be solved, consider the next step.

2. Replace the power board

The power board of the LCD liquid crystal screen is an important part that controls the entire display screen. If the power board fails, it will cause the LCD screen to go dark. At this point the power board needs to be replaced.

When replacing the power board, pay attention to the following points:

1). Confirm the model and specification of the power strip to ensure that the new power strip is compatible with the original one

2). Before replacing the power board, it is necessary to disconnect the power supply of the LCD screen;

3). After replacing the power board, it is necessary to reconnect the power supply of the LCD screen and test it.

3. Check the signal line

The signal line of the LCD liquid crystal screen is an important part of connecting the computer and the display screen. If the signal line fails, it will cause the LCD screen to go dark. The third step is to check whether the signal line is working properly. You can try to replace the signal cable, or reconnect the signal cable.

If the signal line is not faulty, you can consider the next step.

4. Replace the LCD screen

If the above three steps cannot solve the problem, then the LCD screen needs to be replaced. When replacing the LCD screen, you need to pay attention to the following points:

1). Confirm the model and specification of the new LCD screen to ensure that the new LCD screen is compatible with the original LCD screen;

2). Before replacing the LCD screen, it is necessary to disconnect the power supply of the LCD screen;

3). After replacing the LCD screen, it is necessary to reconnect the power supply of the LCD screen and conduct a test.

There are many ways to repair the dark LCD screen, including checking the backlight, replacing the power board, checking the signal line, and replacing the LCD screen. In actual operation, it is necessary to select the appropriate repair method according to the specific situation. If none of the above four steps can solve the problem, then you need to contact a professional for repair.

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