I have a Sony Data Projector, model VPL-PX31, (about 8 years old) and the brackground color has steadily faded from black to blue. I learned that this symptom is most likely caused by the prisms slowly getting burned by the internal UV light.
Is that true, and more important, is it repairable at a cost lower than purchasing a new similar product?
I have the same projector, but my problem is with red.
A replacement prism assembly is about $2k.
If you can get your hands on another projector for cheap, that's your only hope. You can swap out the blue lcd panel from your prism with someone else... it's a bit of mucking around, but worth it of you can.
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There is three LCD in the projector red, green and blue. If green LCD make any fault mean line or dot or dots then screen show these line or dot in purple color:
If line is very straight and sharp edges then green LCD is faulty and need to be replaced.
If line is not straight and faded edges then some thing in LCD block so your projector need service
If this projector is an LCD (liquid crystal display), your LCD probably gone.This usually happens after a period of time with an LCD projector.Try cleaning the LCD or take it to your Sony dealer.
Most often color distortion is due to the bulb wearing out. Projector bulbs often fade or distort colors before they actually burn out. The other thing you can try is to reset the projector to it's factory settings, which sometimes fixes color issues. It's usually an option in the "settings" area of the menu.
it's not the prism. chancs are it's the light filter(s) on the lcd panels. the prism is just coated glass. the light filters determine the color. you need to take the top off, the main board off (unplugging the ribbon cables), and the lens off. the lcd panels anf the filters are attached to the prism. remove the filters, but do not remove the lcd panels!
Its your blue polarizer going bad. This happens over time due to the excessive heat generated in the projector. The main problem is that your projector has organic LCD panels that degrade over time and in turn degrades your blue polarizer. The same thing happened to my sanyo Z2. It took 5 years for it to show on my Sanyo because I only use the projector for sports and movies. not daily tv watching. In any case, it isnt worth it to spend the money ti fix it...jut put tat towrds a new projector. The latest crop of LCD projectors almost all use in-organic LCD panels that last much longer. Hope this helps.
Unfortunately an expensive repair or total replacement are probably your only real options. Electronically the projector is fine but your problem lies in the physical optics part of it. Either part of the lense assembly or the refraction array is likely damaged or at least very dirty. I wouldn't suggest trying to clean it yourself as this is a 3 LCD projector and all 3 must align perfectly after cleaning or you'll end up with seperated colors. It could also be one of the LCD's is damaged but from your description I don't think so.
I have a client that had the exact same issue with a different VPL model and it was cheaper to go out and buy a new projector than to fix it.