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Ours used to do that - and then we moved it to another state with us. Since the move it doesn't shut itself off anymore. I suspect that the problem was dirt and dust inside which got knocked loose in the move and the shutdown was due to thermal limits being exceeded. You may want to try vacuuming or blowing out the dust inside if you feel comfortable opening up the unit.
Your TV is overheating.. easiest remedy is to point a fan at the back of the TV or... clean the inside of the TV, Im sure its full of dust and stuff... this prevents air circulation inside the TV thus creating more heat...
replace the flyback. you can get a replacement at the following link with free tech support to expain step by step how to replace it. you need flyback 259296 Heres the link. http://servicemanuals.vstore.ca/
I would turn the circuit board over and check for clod solder joints and cracked solder, you will have to look close, my other sugestion would be to get a can of freeze and spay the different IC's and see if it stays on longer.