I Had the same problem. I removed the lamp and found the wires for the cooling fan had got hot and the protective cover missing in spots bare wires were close enough to short Itaped them up reinstalled the lamp and it is now working. Don't know how long it will last so I'm ordering a new lamp assembly.Just in case,
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If the tv is still under warranty, this can be repaired at no charge.
However, if not under warranty, you will need to have the CAPACITORS on the main power supply circuit board tested (or replaced).
The capacitors responsible for the power supply can sometimes fail - open the back panel. If the capacitors on the main power supply board look too fat, or signs of burning near the solder joints, then you've found the problem.
The fact that the television stays on for hours and other times turns in five minutes shows that your problem is intermitent .A defective component in the power supply is probaly causing the B plus voltage to go up.The TV can also have a dry joint which looks more likley i am curtain if you gave the TV a firm tap to the side when it come off it would come on back. Try it .
hi this s grizmofreak
solution to above problem
this s because of the secondary emissions of picture tube, and once the supply stops the emmissions from the picture tube wont stop for few seconds and horzontal scannin problem.
i have seen this before and it may be the front power button being stuck and when your remote turns it on the stuck button turns it back off again. I have an older mitsubishi that will not boot up right sometimes and i have to unplug it and plug it back in fot it to come on. I used to pick up broken tv and fix the power buton and resell them