I bought this projector last week in second hand, but unfortunately with a "small" big problem, vertical color banding/spots. In the follow link it's possible to see (photo 1):
Searching i found that could be just a dust problem in polarizer, so after disassembly check it and nothing, all seems like new. I look also in other parts, lcd's, mirrors, and small lens between lcd and polarizer and i found one (after blue polarizer) with a dust pattern like the banding, i try to clean but then i realize perhaps not just dust but a kind of tint working like a filter. Other 2 lens have a small coloration but without imperfection, blue one is almost transparent.
Dust or tint, causes a problem, so i try to remove it with sucess (with a cloth to clean glasses), after i try again in the same scene (photo 2) and it looks much better, but with a blue tone. Testing other color profiles i notice that create a new problem, now i have uniform colors but always with a blue saturation impossible to remove, black levels (deepest or not) disappear and now i have blue everywhere, but mainly in dark scenes.
The problem is simple, i remove the fine painting acting like a blue filter to create deepest black levels. Now i'm looking for a new lens, but i can't find, searching at the service manual i didn't find, i don't now if it have a special name, no one speaks about this lens (photo 3).
If anyone have the same model or a AE1000/2000/4000 for parts, please reply, i need one of those lens.
...and sorry for my english!