Question about InFocus LP 600 Multimedia Projector

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LP600 - Grainy picture, very poor quality

Used projector last night for about 3 hrs with no problem. Turned it on today and picture is very grainy and visually "noisy".

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Single chip DLP projectors use a spinning color wheel between the lamp and the DMD (mirror chip) to produce colors. If the wheel rotation/synchronization is disturbed, colors will not be displayed correctly.
In my case it looks like the wheel became un-synchronized, probably because the projector was dusty/dirty inside (a light senor is used to detect the wheel position), resulting in a grainy, slightly flickering image.
I simply blew out the components with a can of 'Dust-off' and, using a small tool, rotated the color wheel by hand to make sue it wasn't rubbing or jammed.
I reassembled & started the projector and the image was back to normal.

Posted on Jul 19, 2008

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