Halo problem


Hello everyone.

For the past few days, the projector has been projecting a sort of orange halo, in a band along the edge. It is particularly noticeable when the projected image is white. I enclose a photo (in which I have highlighted the effect a bit because it was taken during the day). What could it be? I've already tried cleaning the external lens, and opening and cleaning everything that was reachable, both towards the lamp, and towards the dlp wheel (I didn't disassemble the block with the mirrors).
It's not a problem with the screen or reflections, as the problem is visible even by placing a white sheet of paper a few inches from the projector.

Does anyone have any idea where the problem might be?

Projector: BENQ W1000+

Thank you very much!

Translated with www.DeepL.com/Translator (free version)


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