What can do to fix my tv?

Sounds like the fan's thermostat is bad. You will need to trace out the wire to the thermostat and replace

change the input on the tv turn on the tv from the tv itself and switch inputs till it stays on.

your tv has a fan cooling problem 1 or more of the fans is out.

your Audio output chip has gone south and shorts out after warm up The unit will shut off to protect itself you need a tech to replace it try Pinicle Service solutions in Haverhill ma

If this TV turns back only when it is cooled down than it has cold solder joints tha have to be resolderd.

I believe it is an overheating problem...
Short term fix...place a small fan behind your TV on bottom right hand corner and your TV will not shut down

it souds like the cooling fans arent working correctly. if the tv is staying on long enough to warm up and then shutting down i would look at the cooling fans

I have the same exact problem with my Go Video 32" HDTV. Yesterday the power stayed on for several hours, now it wont stay on for more than 5 - 8 minutes.

Please someone help!

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Picture tubes rarely go bad. You have a bad connection or something on the circuit board that is breaking down due to the temperature change . Probably an easy fix. Not something an unqualified person can do though. Your local shop should fix this for about $60-100.

It's definitely some kind of cooling problem, or a cold solder joint that looses connection when things warm up. Can you turn it back on right away after it shuts itself off? You can purchase a freezing spray and use that to spray different areas on the circuit boards to find the problematic one, then you can get down to an individual component.