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It sounds like the polarizer filters are starting to ware due to heat build up, if you remove the lid and the main booard, there is a white plastic mesh cover over the lcd panels, you can remove this and adjust the polarizers for the red, green and blue lcds to adjust the black level, there are 3 hex bolts holding a plastic frames which in turn hold the pre polarizer filters, buy slightly loosening the bolt you can slide the plastic frames left or right to adjust the levels, buy you should mark the position before you start. this may not solve the problem but may help to improve it, unfortunately these projectors require special software to make electrical adjustments which is hard to get hold of.
Check Ceiling feature. Press MENU button and ON-SCREEN MENU will appear. Press POINT LEFT/RIGHT button(s) to move a red-frame pointer to SETTING icon. Language used in ON-SCREEN MENU is selectable from among English, German, French, Italian, Spanish, Portuguese, Dutch, Swedish, Russian, Chinese, Korean and Japanese. Display This function decides whether to display On-Screen Displays. On ··· shows all On-Screen Displays. Off ···· sets On-Screen Displays disappeared except; ? ON-SCREEN MENU ? "Power off?" message ? "No signal" message ? "Please wait...." ? P-Timer counter Set a red frame pointer to item and press SELECT button. Press POINT DOWN button to move a red-frame pointer to item that you want to set and then press SELECT button. Se ting dialog box appears.
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.
Yellow is the mixture of 100% red and 100% green. what you may have here is a blue LCD failure in the machine. Try this to check. Open up PAINT and double click one of the colors on the bottom. now click add custom color. then in the RGB section put 0 for red 0 for green and 255 for blue. ok out of everything and fill the background w/ the blue. it should be a VERY intense blue, if its white or or kinda blue, you have an LCD issue
In short If the reds show as red, The greens show as green & Blue shows as blue. I would say thats as good as it can project. It's hard to judge color without seeing it for ones self but usually DLP projectors that use a colorwheel do not have perfect color.