LG LCD TV image darkens and the sound is normal?

1. It may be caused by abnormal power supply circuit of LG LCD TV. The phenomenon of this problem is that the panel buttons are unresponsive and the indicator light is not on. 2. It may be because the voltage of the power supply is too heavy, and then the voltage is pulled too low, or there is something wrong with the signal processor in the later stage, and some circuits are damaged. 3. If the power supply of LG LCD TV is normal, the reason may be that there is something wrong with the driving backlight circuit of the TV, which leads to the sound on the black screen of the TV.

/Suggested handling method:

1. First check whether the voltages of LG LCD TV 12V and 5V are normal. If the voltage is normal, there may be a problem with the series connection of the input power supply circuit. This is usually because the power supply fuse is blown or the voltage stabilizing chip is faulty. If the TV fuse is blown, it needs to be replaced.

2. It is necessary to eliminate the faulty components one by one, then check out the faulty components and replace them to make the voltage return to normal. When replacing, you should go to a professional maintenance point to find a professional maintenance person to replace it.