Question about Mitsubishi VS-55705 55" Rear Projection Television

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How to fix the video power supply for mit VS-4544 ?

How do I fix the video power supply on my mitsubishi VS-4544 rear projection TV? I have sound, but no picture. Will leave tv off for a day or two and picture back for awhile. Problem keeps happening more often now. How do I fix it without having to call a repairman?

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Let me preface what I'm about to suggest with my own comments. I've been a TV Technician for more than 20 years. That said, you don't fix it without calling repairman or you wouldn't have posted here. In this unit there are common lytic caps that should be replaced without question. By location number and value they are: C979 2.2uf/200v C531 2.2uf/160v C551 2.2uf/160v C981 22uf/50v C402 47uf/35v Next it might be a good idea to ESR test other caps in the B+ line. ESR stands for (equivalent series resistance) It's a way of measuring the cap's effectiveness in a circuit. There are testers on the market for just under $200.00 for the backyard technician and they are a must. Check the set for ring cracked solder joints. The symptom of leaving it off for awhile and then being able to get a picture suggests that it could be ring cracked in one or more areas, usually areas of high heat. When all else fails there is calling the repairman. If you don't know how to find a reputable shop in your area I might suggest contacting NESDA (National Electronic Service Dealers Assn.) who can give you some reputable shop contacts in your area. Good Luck! Bill

Posted on Jun 04, 2007

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I have the identical model, purchased in early 2000. I had the same issue, and called Mitsubishi service. Turns out there is a known problem with the video power supply. Mine was under warranty when it was repaired (in 2002), but by now yours probably is not. I recall the repair guy did the fix with no parts, just a soldering iron. If you're handy, you can probably get the details from MITS service and try the repair yourself. If not, I suggest the repairman route.

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