Question Weird artifact on screen which looks like a rainbow hair (DLP projector)

Nicolinux

Novice Member
Hi, well yes the title says it all. I have this weird artifact since yesterday with an Optoma HD131Xe. I have replaced the lamp 6 months ago and everything was fine. Now I bought a projector screen and wanted to set it up but before I even began, I saw this...

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Any idea what this could be?
So far I have removed the lamp and checked the color wheel. There were some specs of dust on it (on the inside) and I managed to remove them:
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Yes I know, this was incredibly dangerous/stupid but it worked. However the artifact only changed slightly which indicates that it might be related to the color wheel:

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Thank you for your ideas,
Steve
 

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