I've had the Z30k for a couple years now. I have about 1,500 hours on it, according to the counter. Still bright enough for my needs (mostly TV watching). However, the other day I developed a weird problem from out of the blue.
I was watching TV and didn't notice anything unusual during the first show. Then, during the second show, I noticed a couple of strange spots in the lower left corner of the screen, visible during dark scenes. At first, I assumed it might be something in the source signal, but no, it's the projector. The spots are now visible anytime the screen is dark, no matter what source I watch. Here's a photo of it during the splash screen on my Blu-ray player. (I've boosted the brightness so the problem is visible here.)
Content is still visible through the spots. It looks like some kind of glare.
When the screen is bright, I see a single dark spot:
Thinking this might be an obstruction in the light path, like dust or something, I checked the lens and blasted it with compressed air. No change. I also pulled out the lamp and took a look inside. Didn't see anything in there, and I didn't want to disassemble the projector beyond that.
Has anyone experienced this before? Any thoughts or suggestions?