Why my TV is stuck on standby

@colonel62932 the power LED shows that the power supply provide standby voltage the mainboard. Once the mainboard receive a signal from the IR board to turn on, it signals the power board to do so. In your case, this could be a bad main board or a bad IR board.

Time to unplug it, and to remove the back cover. Then take a look for any obviously damaged looking parts on those boards. Take a couple of good pictures of the boards and post those with your Question. That way we can see what you see and hopefully guide you further,

Adding images to an existing question