Benq MX 764 DPL White blobs, dust or pixels?

LLab

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Hi there,

I am quite new to this problem, never had such an issue with a projector before.

Practically, I have bought a refurbished MX764 DPL projector it looked pretty good conditions until I have moved the focus rig to the full right and I realised that a lot of white blobs come out. Few look like dust particles and wires others like dead pixels see attachments.

The strange think is they appear just when I focus them, if out of focus I can just see the bigger ones showing as translucent withe circles.

From your experiences, do you think is dust or dead pixels? If dust, is there a way I can clean inside it? Can I try to blow inside the fans with some cold air from a hairdryer ?

Thank you
 

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I heard that air compressed air could spill some liquid. Is this true?
 

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