I have a lot of these projectors, and after replacing a bulb on one of them recently, I found that the image was a bit blurry, and there was an uneven purple discolouration across the screen. I wasn’t convinced the new bulb was to blame, so I went looking for another explanation.
I quickly found advice online that a “blotchy uneven purple in the image is caused by dust contamination on the green LCD”. I’d already tried cleaning dust out with compressed air via the side vents, but clearly it needed a more thorough job. It was time for a disassembly.