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Hello There!!!!!!
Well this is gonna take some work... First thing to start with is...
When you replace the bulb/s -does the bulb actually illuminate?
If you shine a very bright light into the surface of the screen can you see a faint image of whats on the set?
Do you get sound?
If the bulb is illuminating, is it blowing soon after?
Did the set return to normal operation after replacing the bulb the first time?
Side Note-Never touch a high power bulb glass enclosure because you can leave oils and moister that lesson the life of the bulb or make it more prone to blowing. I have no facts to support this note beside my own experiences but this is a known "thing".
Questions? Just ask. Mr.Mike
First a TV repairman needs to diagnose the problem.There is so many issues with DLP TVS.An aging bulb,a wire short,or a circuit board issue could be causing the overheating in the unit then its cooling down allowing it to turn back on.The most typical issue is an aging lamp or bulb.An easy fix but depending on the unit could be costly call Mitsubishi get the bulb replacement part # for your TV model then go online and find it for a discounted price.
There is a slight chance that you might have an issue with a defective ballast, I mean 3 lamps in 2 years, it's too much. The best way to go here is replacing the ballast, that might solve the issue.
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