Power light on no picture and can only turn off by unplugging

i think your power board has some serious problem

There is a way to tell if you have a bad board, or a bad panel.

1. Make the room dark and turn on the TV. Can you see it light up? If so, does it stay lit or turn right back off?

2. If the panel lights, but you have no picture, I would suspect the T-con. Some units now have the T-con incorporated with the main board, so you will need to check.

3. If you never get any light at all, then I would suspect the power supply.

4. If you only get light for a second or two, then you have a bad panel.

turn tv on picture comes up 2to3 seconds later tv blacks out then stand by red light flashes 4 times in a row repeatedly..can not turn on or off when stand by light starts flashing but before tv blacks out you can turn tv on and off repeatedly and picture and sound work.You have to unplug power cord for 30 seconds after stand by light comes on to get tv to turn on.

chip on ic board repair shop might replace it and reprogram if the tv is worth the fix

60PL9200D/37 When I unplug it for a while and turn it back on, the picture starts to come on, but it turns dark. And the red lights on the left and right side of the power button blink. Sound but no picture.

Red light comes on but no picture

Power supply PC board must be rebuilt = replace all bad capacitors.............T.

Classic power supply or horizontal output problem. Take it to a servicer.

I have the same problem. The only way to get the TV to come on is to unplug it, but once you get it back on it turns itself off again in a few minutes.