I have a Sanyo projector. Looks like dust on the image in some places - splotchy patches (not uniform), noticable in lighter scenes, not really in dark scenes. I used compressed air to blow off the LCD panels - no luck. Took it to a 'repair' guy - he charged me $100 to clean it - looks the same to me. If you click on the photo to enlarge it you will see what I mean - especially near the top of the screen. I THINK it's dust but would like some feedback before I take it back to him. I am not an expert.