My InFocus ScreenPlay 4805 DLP projector recently started beaming a faint bright spot in the upper left quadrant, only noticeable on a very black screen, whether or not a movie is playing. There has always been a large faint halo when the lamp is about to shut off but this doesn't seem related. I've used the projector for about 100 hours.
I see no flaws in the lens glass or mirrors inside, except for scattered dust. With the projector off, when I shine a flashlight into the front of the lens I see a metal strip cutting diagonally across the upper left edge of the hole behind the glass. Nothing is cut off on the screen so I assume that's normal? I never studied it before. The picture looks as good as ever except for this brighter area. Below is an approximation of the relative brightness and shape of the defect. It sort of looks like a moth or a dumbbell but it's not as uniform as this image.
Alturas