1. If this problem occurs, it is most likely that the mainboard of the TV has been damaged. If the mainboard is damaged, it should be that the capacitor on the back of the mainboard has cracked or deteriorated, causing this problem. 2. It may also be caused by the TV going into sleep mode. 3. Another situation is that the TV screen or backlight panel is faulty.

/Suggested solutions:

1. First check whether the TV has been repaired and crashed, and determine whether the TV software version has been upgraded to the latest version. If so, Then you need to use the remote control to long press the power button to turn it off, and then wait for the light to go out, then press the power button to turn it on. If it cannot turn on, you can only unplug the power and plug it in again to turn it on. 2. If the motherboard of the TV is damaged, then you need to repair the motherboard or replace it directly. Just replace the capacitors in the motherboard with the same model and size. However, repairing the motherboard requires rich maintenance experience and professional theoretical basis. As well as professional tools, if you do not have these conditions, it is recommended to find an experienced repairman to come and repair it. 3. If the screen or backlight panel fails, you need to find a professional repairman to repair it.