After the computer is turned on, the LCD screen lights up for a moment and then goes black. This is a problem with the LCD screen, including two types: dark screen failure and black screen failure.
The first type: dark screen failure: when the LCD monitor lights up once when the computer is turned on, the screen becomes black. First try to look at the screen with a flashlight to see if you can see the image. If you can see the image, , this is a dark screen failure, and most of it is a problem with the lamp tube.
This is because: the capacitor at the output end of the power circuit part bulges and leaks, or the high-voltage package is short-circuited, the high-voltage coil is open circuit, the adjustable resistor is damaged, the switch control tube breaks down, or the lamp tube is damaged. This phenomenon often occurs when the screen is turned on and then goes dark immediately after powering on. The lamp is most likely to be damaged.
Treatment method: Just replace the lamp.
The second type: black screen fault: when the computer monitor lights up when the computer is turned on, the screen goes black. If you cannot see the image when looking at the screen of the flashlight, it is a typical black screen failure. Generally, a black screen is caused by a fault in the power circuit and driver board circuit. For example, the large filter capacitor of the power circuit has leakage, bulging, or leakage, the performance of the power oscillator chip is degraded, there is a short circuit inside the power switch tube, and there is also filter electrolysis at the output end of the power supply. A black screen failure will occur if the capacitor bulges, leaks, or fires, or if the performance of the MCU chip in the driver circuit decreases, or if there is a problem with the stable power supply or too high voltage regulator.
Method: Repair the power circuit, drive circuit and components mentioned above.
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