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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Re: How to fix the video power supply for mit VS-4544 ?
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:
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.
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Its a old set but hookup should from a DVD player be to the rear audio and video inputs---note color of jacks on player--you will need for that old set composite--yellow(video and color), red and white for sound.
If the player does not have them (composite) you have a real problem.
Once connected use the input button on the front of the set to change to that input that you hooked the player up to (video 1 or 2 etc.)
That is a VZ3 chassis, similar to Mitsubishi models Ts-4545, Ts-5045, Ts-5545, Vs-4543, Vs-4544, Vs-5043, Vs-5044, Vs-5047, Vs-6043, Vs-6047 and has common failures in the vertical circuit, specifically vert Ic401 which is a La7845 which is usually caused by defective C402 100uf 50v and/or open 1.2 ohm 2 watt R510 next to FBT.
If not that check C268 off Q215 on signal board 22mf/50v and Ic200 on signal module Cxa2025s. However the vertical failure is more likely.
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.