3820 hours and my first lamp went out. Figured it was time to look at the lenses while the set was pulled out of the cabinet. Made sure the new lamp worked first!
The lens in question (
) appeared to be smudged in the center 2/3 area by either lightly smeared thermal grease (heat sink compound) or out-gassing of thermal grease (heat sink compound) from somewhere. It was a mess. Think about trying to remove thermal grease (heat sink compound) from a precision coated optical glass lens buried in a barrel. Took over an hour to cleanup.
There was also a fingerprint on the final output lens (not from me) that was noticable when I pulled the LE. I pulled the shield and cleaned that also.WARNING: The lenses are coated and can be ruined if you apply strong chemicals or rub them too much.
After the cleaning and re-assembly, only had to tweak the rotation slightly and adjust VERT and HORIZ position electronically.
YEP, it's like new. Major improvement in brightness, contrast, resolution, sharpness. Looks like it did on DAY ONE.
KUDO's to videobruce for gathering all these pics, posts and info in one place and for including the pictures/service manual extracts for those less AGREEABLE TO THE TASK(up to the challenge).
Could it be out-gassing of thermal grease from behind the DMD chip or used as a lube for the iris/shutter?