Not many funguses can thrive under the intense heat from the lamp. The Ultraviolet light that the lamp produces reacts with the plastic lamp housing and deposits a film on the optics and color wheel. They can be cleaned with water. I would not use any chemicals on the optics or color wheel since they leave a residue behind.
SOURCE: InFocus LP 850 Projector, yellow spot on screen
Hello,
Unfortunately the discoloration is caused by the extreme heat generated by the Lamp has burned the LCD optical polarization filter/elements.
The only solution for this is to replace the entire LCD optical assembly.
Sorry for the bad news, :(
SOURCE: Hi there my benq dlp
This is caused by dust on the lens assembly. If you can remove the lens, clean the surfaces with a lens cloth. That should resolve the problem. It is possible that the there is dust in the optical pathway inside the unit as well. If the cleaning of the lens does not resolve the problem, the unit should be brought in for a professional cleaning. It is not suggested that anyone open up these units as there are fine adjustments that can be changed internally easily that could result in convergence problems.
Dan
SOURCE: When linked to my laptop, the Sanyo PDG-DSU21N
You need to send your laptop signal to your projector by pressing the FN key and the key that says CRT/or an icon of a screen (this is located at the top of your keyboard). 3l toggles will give you different images. i.e. projector image only, projector image and laptop image or just the laptop and not projector image.
SOURCE: im using sanyo pdg-dsu21b model.
This may be dust on the inside of the lens. If you recently changed the lamp, you may have disturbed some dust inside the projector. Try focusing the projector so the white spots come into focus. You might be able to see that it is dirt, hair or a dust ball.
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