The TV hasn't been turned on for too long. Why is it black?

Generally speaking, the reasons are as follows: 1. The TV power indicator is on, indicating that the TV has been turned on and the screen is not bright, which may be caused by the TV being in standby state; You can wake up the TV and light up the screen by pressing the standby button of the remote control. 2. Make sure that the TV is not in standby state and can't turn on the screen, so that it can basically be judged that it is caused by the hardware failure of the TV, such as the switch circuit, power supply system, internal circuit short circuit or open circuit, motherboard chip and other parts failure. , and contact maintenance personnel for on-site maintenance. Let's take a closer look at the reasons and solutions: 1, the power supply is normal, and the line part does not work. It may be that the collector voltage of the push tube is abnormal. If it is normal, it is important to check and repair the output part of the line and completely close the line of the output part of the line. 2. If it is the cause of the protection circuit, we must first determine what the protection action is. Disconnect each protection branch one by one, troubleshoot, and then check separately. Replace the resistance wire after finding the problem. 3. Check whether the line load circuit and output transformer have overcurrent protection or the power supply cannot work normally due to excessive current. A protective strip can be replaced to solve the problem. 4. Memory damage or improper data setting will lead to a black screen.