TVs are already a very common household appliance, so the frequency of failure is also very high, especially when the TV suddenly has a black screen. So what is the matter with the sudden black screen of the TV? The editor will tell you below.
1. If this happens to the TV, it is very likely that the TV's power supply sound image processing is basically working normally. If the display screen is not lit, it may be caused by abnormal power supply of the screen light tube.
Solution: In this case, first check whether the TV power supply has 12V to the high-voltage board. If there is no 12V, then try whether the L503 can supply it normally. If the output voltage of the L503 is not problem, and the TV display screen is still not lit, then it may be that the TV booster plate is faulty. You can try to replace the new booster plate. If the display screen is still not lit, then the display screen is faulty. Change the TV display screen.
2. If the TV suddenly black screen appears when it is turned on, it may be normal. However, if the TV displays the TV's words, there is no image. This sudden black screen may be a problem with the TV's backlight board and transistor . 
Solution: If there is a problem with the backlight plate and transistor, it is very likely that it is empty soldering. Generally speaking, the manufacturer does not directly welding the copper skin during production. At this time, we only need to use tin to repair the soldering.
3. The TV suddenly blackened the screen. We need to check if there is a problem with the power circuit of the TV. If there is a problem with the power circuit, you will see that the panel buttons of the TV are not responding, and the indicator light of the TV will not light up.
Solution: At this time, we should first check whether the voltage of the power supply is too low. We can use a meter to detect it. If the voltage is too low, then we should install an voltage regulator at home, so that the voltage of the TV can be stable.
I hope it will be helpful to everyone.
