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Re: Mitsubishi VS 4543, Picture go out after a few...
I usually find that symptom you describe is caused by cracked solder joints on the power regulators or vertical output IC. I have also seen that symptom caused by loose solder joints on the vertical windings up inside one of the yokes. If you have experience in repairing TV's then you can disassemble the set and pull the main chassis, flip it over and resolder all of the parts mounted on heat sinks. If you do not have experience in repairing projection TV's then allow a qualified tech to handle it for you.
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Check and replace the main power regulator [SMPS] board to your TV. Contact any service technician, or the authorized service center for Mitsubishi. If you wish to get some details; check the site linked here. Viewing it in "Mosaic" will make surf easy. http://electronicshelponline.blogspot.com/
2 THINGS CAUSES THIS PROBLEM ON THESE --- THE BLUE PICTURE TUBE HAS LEAKED FLUID ON THE CIRCUIT BOARDS ,,,THAT 'S BAD
AND SOMETIMES ,WHEN THE VERTICAL CIRCUIT GOES OFF ,,THE SCREEN WON'T LIGHT UP ,,,THAT NORMAL ,,,KEEPS FROM DAMANGING OTHER PARTS
U NEED A TECH TUNICA