Originally Posted by KenWH
Most likely a dust blob. You can try using canned compressed air, which is readily available, to dislodge the spec of dust. You might do some research as to what areas of that particular pj are best to hit with the air.
edit: I suggest the canned air/duster over using a "shop" compressor as shop compressed air can contain moisture...the canned stuff is designed for dusting/cleaning electronics.
Never !!EVER!!! blow compressed air into a projector without disassembling and removing the optical block as this will almost always just blow more dust into the optics.
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