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Re: yellow tinged edges
Your problem is most likely your Blue and Green lens' inside the light engine. It's not something you can replace yourself. I worked for Philips for 14 yrs. repairing the LCD projectors the last 6 Yrs. Call philips and get the number of an ASC in your area that has repaired projectors.
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It sounds like one of the polarisers has failed, on experience they cost £300 each to replace, and there are 3 of them. I recently bought an NEC NP115 for just over £200, very good spec for the cost. It maybe worth investing in a new one.
it is most likely a burned polarizing filter. There is a polarizing filter on the blue light channel and another on the red channel. When black, or other dark colours are displayed, the red polarizing filter is supposed to block ALL of the red light being projecter. If the filter is burned, some light slips through and creates a red tinge on the projected image. If the red tinge only appears on dark images, but is absent when the images is completely white, a damaged filter is likely the problem.
Seems its hard to buy them. Best bet is probably buying a broken projector from ebay and stealing the filters out of it.