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set has a self diagnostic---after set does shut down press and hold MENU AND DEVICE(INPUT) buttons on front of set for 5 seconds----if 2 blinks, a pause and 2 more blinks: this is short protection error code---The set does use 2 Stk394-250 and each is protected by a pico fuse in the power supply---if either fuse is blown the set will shut down(it detects no voltage or missing voltage;) It is not uncommon for a shorted IC to cause this problem; if you locate the STK's look carefully at the resistors around them---if any are discolored or burnt---you have found your problem.
Mitsubishi's have an error code system (press both menu and input/device buttons on the front panel, the green light will flash a 2-digit code...(example one flash short pause two flashes=12 long pause then it will repeat four more times...error 12 is no problem found...the other codes are 21,22,23 and 24.........Good Luck.