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Re: Alignment on the MT1050
The red and blue guns of a CRT projector have mounting screws which when
loosened allow the two outer guns to swing left/right. The central green gun
usually isn't adjustable left/right (another reason to be very accurate when
mounting the projector) Up/down mechanical aim is accomplished by altering
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Could just be that the thing's getting old and wearing out, I'm afraid. How many hours have you logged on it, and what's its ventilation situation like?
Seems it might be something to do with, if not actual "burn-in", creeping physical misalignment of the internal components (e.g. the R/G/B LCDs no longer entirely line up, so maybe you have the blue one beaming light into the gaps left by red and green - ie yellow), particularly due to heat soaking ... Some types are more susceptible than others... I've a 6 y/o Panasonic that is now relegated to the emergency spares bucket after developing this and other problems, which I did initially managed to fix by popping the lid and doing some deep and experimental imager surgery (basically finding that the adhesive holding one of the LCDs in place was starting to break down and the panel had slid a minute amount off its mountings ... dab of superglue and a lot of trial and error fussing to massage the fine alignment to the right position, and it was somewhat improved, until general bleaching and fade-out did for it a few months later) ... on the other hand there's some 9-ish year old NECs knocking around here that are more or less fresh as daisies. Go figure.
If you mean the red light is displaying offset from the blue and green then the red LCD panel inside the projector needs to be physically adjusted. If you take the projector apart you'll notice that the light source is split into red, green and blue light by passing through an optical splitter. Each color then passes through it's own LCD panel. Next, each color is joined back together by another light splitter to be projected to your screen. The red LCD panel is misaligned.
I have done this on several of our PT-LB50U's with sucess every time.Remove lamp cover and lamp.Then remove top of case by removing 6 screws on bottom.Remove metal shroud that would cover lamp 2 screws and remove 2 screws that hold lamp plug and move it away.You will see a little blue lever for saftey switch move it back and forth from top and bottom put back together and should turn on.
I can assist you with that if you want. It is very tedious, but can be done. You need a cross hatch pattern generator or something with vertical and horizontal lines to lineup the LCD Panels again. Tricky little procedure if your not familiar with it. Let me know if i can assist you and hopefully save you agravation at the same time. Thanks Jay
I believe this indicates a lamp failure. Make sure the lamp is seated correctly. If you haven't checked, take the lamp out and look at it. I left off a connector (the yellow wire I think) once when reassembling an mt1050 and had what I believe was the same indications. If you have taken the projector apart double check that all the wires are reconnected. Other than that I'm not sure.
i also have the exact same problem. i picked up 3 of these used for my work and kept one at home. I knew one had issues and another had a burned out bulb and so on. I had a repair place to combine the two to make one good one. The repair man said that they had a real hard time keeping the color locked in alignment. It's not a physical alignment, its controlled by the board output and somehow the board can be adjusted. It was vague to me. After about a good couple of years of hard use the one at home is now doing the same. On one hand I want to fix it but I dont even have a plasma so I may go and spend $800-$1000 on a hi def DLP. At that price it won't be the best but it will rock this projector. that would be my advice rather than putting more money into this old model.