Have sound, no pic. Unplug hold power button works for short time only

hodgee_1 sounds like a "A" board issue, but you do want to check a few things first. If you can let us know the number of blinks of the Power LED on the front panel of the unit. You will need to unplug your set and remove the back. Then take a look at all the board. Check for domed, leaking or obviously damaged caps. Post some images of what your boards look like with your question. That will allow us to see what you see. Use this guide for that. You will need a multimeter to check a few connectors. Let us know if you are up to it.