
First, check if the power supply to the display screen is normal. If the power supply is abnormal, replace the power supply module. Next, check if the cable connection is good. If there is a problem, replace the cable. Check if the display screen is damaged. Replace the display screen for testing. If it returns to normal, the display screen is damaged. If the issue persists, with normal power supply and good cable connection, check the video output signal of the motherboard and replace the motherboard for testing.


