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this discoloration is the begining of the lcd panel being thermal damaged. this happens when the projector is being used for a long period of time and then being shut off using the switch on the rear of the projector instead of the on/off on top or the remote. to fix it it will have to be replaced. very expensive major repair.
either the light filter behind the blue lcd panel or the fly-eye lens (both inside the optical engine) have developed a burn spot from overheating. infocus doesn't sell individual parts for the optical engine, and the whole thing must be replaced. but unfortunately, it's the most expensive part of the projector, usually upwards of $2000 (and there's none in stock).
This is going to hurt..
You probably have a polarizer failing on one of the LCD panels inside.
There are 3 of these in LCD projectors, red, green, and blue. They all get the light fed into them, that light is then combined and fed through the projection lens.
You will need to contact Sanyo to find a service centre to replace it.
I can't imagine a setting that would cause this - It sound more like some sort of fault with the projector's blue LCD panel. (The image is created from a mix of red, green and blue light. If you loose the blue, everything will look yellow.)
Is it capable of showing any shades of blue?
Using any graphics or photo-editing software, create a solid blue image (R=0, G=0, B=255 in your colour settings) and if possible, display this full-screen. Is there any output from the projector at all when you do?
If not, it sounds like it need a professional repair.
Looks like your projector has done it. Thats acommon trouble to ageing polirising lens, usually the blue. less blue, the green and red make up the yellowish image on the screen. The blue is bombarded with tremendous heat from the lamp and it fade and wash out. If its free, its worth replacing. Get quote for the poliriser; 2 pieces each color. Good Luck.
you have to replace prism it has 3 small lcd screens Green Red Blue one of them is beginning to burn they are very expensive strip projector down with no power connected and take damaged screen of then block that area so no light can pass through it with fire resistent material you will get some more life out of it