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Sounds like bad capacitors in nthe power supply, or maybe a regulator in the power supply. Have a tech take a look at this TV set for you, as there are no user replacable parts available in the TV set. Good Luck
When it shuts down, do the LEDS on the front blink? There are 3 of them. Standby, temp and lamp. Do any combination of the 3 blink when shuting down. I could tell you where to start just by those lights blinking.
the tv will cycle the lamp over and over when it goes bad. for some reason, it doesn't spit out the lamp error. the steady green blinking led means the tvs coming on. replacing the lamp will solve your problem.
If you TV is about 2 1/2 yr you probably need a new lamp they only last about 3 yrs. Mine popped one night and now picture comes in for about 1 min and goes out, I ordered a new lamp today they run $199. There is also a know issue with the thermal fuse. The part cost about $3 and if you know a lil about electronic you can replace it yourself