Chosen Solution

The standby light turns on and disappeared immediately, what should I do pls?

Hey Chidozie, How old is your LG? What is the type? If the light goes out immediately it sounds like your powersupply is failing. I guess the device is not under warranty? Depending on your skillset, replacing the (small) capacitors on your powersupply is the first way to go (some might be bulged or have some visible damage. If you don’t have the skillset, look for someone with some electronics expertise, since this could very well be a very simple repair (5€$ of components 15 minutes of soldering). If you have any questions let me know. Kind regards, Tom