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Does this unit have a projection bulb in the back end of the set? Just based on my experience with a friend's 65 inch rear projection TV, there might be an indicator light on the front panel that may blink if the rear projection bulb is failing. If there is a failing bulb it could account for the screen going black with everything else just fine, after the bulb gets heated up in 15 minutes.
What a great tv this is Mitsubishi did a fine job making this one, but......only an authorized mitsubishi servicer should repair it. This set records diagnostic led codes that the technician receives to help determine where the problem might be, not the problem, but in which circuit it might be. The one thing to try is, unplug the tv , let it set for a minute, plug it back in , turn it on and hope it reset the micro. Next , call for mits. service.
My tv won't come on, it was working perfectly then all of a sudden it started showing timer minutes and it went off. when i turned it back on it wouldn't come.I reset it, it still won't come on, i don't know what to do.
Some Models will shut down when no signal is detected.
Try unplugging the TV from wall/power source for 3 to 5 minutes.... plug back. Same thing? Go into OPTION MENU, press 'MENU' button on the remote > enter 1270. Choose reset system. If not there go to the SERVICE MENU, press "MENU > 1257 (same thing).
CAUTION: before you change any settings, document them (write down).
Turned out to be a problem with my dish receiver. Found out by attaching a separate DVD unit to the TV, and it didn't flash. I then realized everything ran through the dish receiver. Called them, reset ( by unplugging for 90 seconds) and all was well.