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Your TV has two microprocessors that depend on each other for communication. The problem is that a power glitch gets them out of sync. Try this:
1. Press the power button and wait for the blinking light to stop.
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2. Press all the front panel buttons one at a time, except for the reset, and power button.
This will send a command to one processor and sets an interrupt.
3. Hit the power button, and the TV should power up.
4. Set the TV to low energy mode(see TV manual to find out how to do this. Doing this step will help prevent the problem from coming back. These instructions were taken from a Mitsubishi service manual.
Yes, you need to replace the convergence output amplifier IC's. They can be ordered on line. After removing the back you must remove the circuit board which houses the amps. Then desolder them and install the replacemnts. If you are extremely lucky there won't be any re-alignment issues with the new amps. Then you should be good to go.
Replace the dm power board . Its inside the metal box on the left (looking at the back with the back removed). p/n 935C986002 Or if you can solder then replace the 7 electrolytic capacitors on the DM power board. value 1000uf16v
Your problem is not shown on schematic, C9A60 (470 pf @ 1000 v) capacitor and check and see if F9A04 & 05 are open. If so then its off to a whole different area. Do you have an email to send Sch.?
They are little green soldered in fuses located on the center board (the one with the STK's on it) toward the rear of the set near the large transformer.
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