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Joseph and Neil, thanks for your advice. I might look into cleaning the fliter so it doesn't get worse - but I wouldn't want to move the bulb until it's ready to be replaced. I suppose I could call my dealer and he could open it up, but I've never got on well with my dealer, and this doesn't...

Here's an odd problem I have with my NEC-VT540 LCD front projector. When viewing a dark scene or a completely black screen I can clearly make out two slightly brighter circular blobs. I'd say they'd be a big as my fists on a 2.4m diagonal screen. Most of the time they are invisible, and I...