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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 the yellow area edges are sharp then the blue LCD is faulty and need to be replaced.
If the yellow area edges are not sharp and you get the multi color background in you image the your need service. due to dust on LCD panals the light is not pass on properly so you open the projector and clean the LCD block.
(cleaning of LCD block and other parts of the projector is a very technical job please very very carefully)
Yes,it is repairable.Blue dots on screen is sign of LCD failure at optical block assembly. There are three LCD on the optical assembly RED,GREEN and BLUE. Blue LCD failure causes blue dots on screen. Repair should be done by replacing blue LCD. Note! LCD replacement needs Extra care and precise tools such as oscilloscope and color pattern generator , for the color alignment after replacing LCD. But if you can afford, replacing the optical block is better,
From your description, it sounds like a problem with the blue color. Green LCD=purple onscreen, Red=cyan(baby blue) onscreen, Blue LCD=yellow onscreen. It could be a lot of dust on the blue lcd panel, or worse, might be a burned polarizer filter behind the lcd panel due to excessive heat. If you can focus on the yellow and its tons of yellow specs, its dust. A burned filter however, must be replaced. A technician trained in projectors will have to do it. The filter material is glued to a thin glass panel and is replaced as a single filter. It's a very involved repair.
the light filter on the blue lcd is fried and needs to be replaced. it makes sure only blue light comes therough that lcd panel. when it's light is blocked from coming through, only the red and green lights can be seen, hence the yellowness (red light+green light=yellow light). it's common with lcd projectors. unfortunately, you can't buy that piece seperately. you need to buy the entire optical engine, which isn't cheap (almost $2000).
there is a burned-in spot on the polerizer light filter for the blue lcd. it makes sure the light is blue coming through, that's why it is black on a blue screen, and yellow when the red and green are the only light showing through. it needs to be replaced. pat # PFiLW0213CEZZ.
The blue device is dying allowing green to shine thru instead of white. Very common problem called color decay. Happens on average about evey3-4000 hours. I suggest next purchase a dlp product, they are immune to this problem. Good luck