Blue diust specs constellation like!

Spots on a black screen that are nearly undetectable or undetectable on a white screen are probably dust. If it's more of a blue tint scattered around the screen that is persistent when a picture is displayed, it's likely a burnt LCD panel. Blue is the most common one to burn. On this model, it's really difficult to "physically" get to the lenses and LCD panels that will be the culprit, but it's pretty easy to blow them off. Carefully remove the cover and look for the optical block directly behind the lens. There will be large square hole in the circuit board with 3 ribbon cables going down to the LCD panels on 3 sides. This is where the culprit dust is likely to be. Carefully blow this area out on all sides (the panels and filters in here are delicate) and clean the rear of the lens if you can reach it. Don't worry about any of the lenses and mirrors between the lamp and the optical block area. The light is pretty out of focus there and would only cause the image to be dark if it was really dirty. Also, pull the filter from the bottom of the unit and clean it really well, and clean it OFTEN or replace it or you will burn an LCD panel.

If you are seeing the "spots" when a black screen is projected, the problem is likely to be scattering caused by dust on the lens. If you can get at both ends of the lens assembly, clean both sides using lens tissue. If the spots are seen at all times, there may be damage to one or more of the LCD panels.

Please update this with your results of the cleaning.

Thanks,
Dan