Check whether the TV is powered on normally, and whether the power plug is loose, which leads to power failure and so on. If it is loose, plug it in again and fix it. Next, check whether the power button of the remote control is pressed to make the TV set in standby state. You can try to press the power button of the remote control to solve the problem. If the above methods can't be solved, it is usually the hardware failure of the TV set that causes it to fail to start. It is recommended to contact the after-sales service of the TV set for maintenance.

Reasons for the failure of turning on the TV indicator light:

1. The indicator light is on but unstable, indicating that the 5V standby voltage is abnormal, and the 5V voltage measured by the meter is only about 3V and unstable. Then, we began to check the periphery of IC12 and the feedback voltage stabilizing circuit. After inspection, no abnormality was found, so we replaced IC12 and the failure remained unchanged. Standby circuit * * * outputs two sets of voltages, one is 5V and the other is 3V, so when the output of 3V is disconnected, it is found that 5V is back to normal, which means that there is a problem with the 3V circuit, and the D3 has been soft-broken. After replacement, troubleshooting the LCD TV

2. After startup, it is found that the indicator light is not on, and it is suspected that the problem lies in the standby circuit or the previous stage. The voltage of measuring 3V capacitor is only about 3V, which shows that PFC circuit is not working. The power supply of the standby circuit has arrived, but there is no power supply output of 5V and PFC, so the problem should be in the standby circuit. When measuring the voltage of the standby IC, there is no abnormality, and the replacement IC is not good, and it is no problem to measure R96 and Q13. Later, it was unintentionally detected that D23 was broken down, so the LCD TV returned to normal operation.