When projecting the screen has a lot of white dots as though the lens needs cleaning ,the outside of the lens is clean
Office Equipment & Supplies - Optoma - EP727 XGA 2200 lumens DLP Multimedia Data Projector...
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Answers & Comments
This is a dlp projector and has a bad DMD chip. Most models are very similar. Here is a video of a similar repair.
Dust has got into light path.
You need to remove the top or bottom panel so you can see the lens.
Have a can of compressed air like for keyboards and electronic circuits.
Blow the air around the light path, have a vacuum cleaner sucking gently to pull all the dust away.
Forgot to say make sure you clean the filters as well.