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Red specks on screen always in the same spot

It acts as though the lens has dust on it but it is clean. I think it has dust on the backside of the lens. Is there any way to clean or blow that dust out? Dave in Ft Myers

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Re: Red specks on screen always in the same spot

You can take the projector apart and carefully clean the backside of the lens.

Posted on Dec 05, 2007

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This sounds like a common 'Dust Blob' issue. Dust can accumulate on the LCDs or inside of the lens. You can sometimes take them apart, and use compressed air to clean the lens and LCDs.

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I have little spots all over the screen display, i believe to be caused by dust in the lens assembly. could that be the problem? i see a lot of dust behind the glass... how do i clean it?


If there is dirt or other deposits on the LCD panels they are usually most visible at the extremes of focus. They will be blobby. You may also be seeing dead pixels which are clearly visible when in focus.The lens assembly itself will be sealed and is unlikely to be the problem, don't worry about flecks of dust in the lens area. You can clean the external lens with a soft cloth, much like a camera lens.

Projector internal optics are non-user servicable. If you can't live with the spots it will need to go to an approved center for cleaning / or repair. You should be able to find out where via this page

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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.


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Open lamp cover and out bulb.Use air blower.It need service

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This is caused by dust on the lens assembly. If you can remove the lens, clean the surfaces with a lens cloth. That should resolve the problem. It is possible that the there is dust in the optical pathway inside the unit as well. If the cleaning of the lens does not resolve the problem, the unit should be brought in for a professional cleaning. It is not suggested that anyone open up these units as there are fine adjustments that can be changed internally easily that could result in convergence problems.


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Hello there. First, some info you need...Green LCD=purple onscreen, Red LCD=cyan(baby blue) onscreen, and Blue LCD=yellow onscreen.
These spots (specks?) are probably dust particles that get past the filter. Annoying but harmless. To check if they are indeed dust bits, if you can focus sharply on them, then yes, its dust. To remove the particles completely will require a service. They will only return eventually. You can try to blow out the biggest offenders with some canned air. And, to help slow down dust entry, keep the dust filter cleaned so that the unit always has plenty of air movement--you'll have a cleaner image with the added benefit of LONGER life of the lamp and projector components (dust is the number 1 killer of projectors)

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I had the same problem. It is specks of dust on the DMD chip that the lens focuses on.

If you take it apart you can see a long telescopic lens that points at a small chip. This chip contains all the micro mirrors that produce the image.

Fortunately this sensitive item has a glass cover. Unfortunately it can be contaminated with dust. I just squirted a jet of air from a camera lens blower brush to remove the specks of dust. Problem solved.

Here is a link to a dismantling guide:

(If you get any dark shadows at the edge of the screen then the light tunnel between bulb and colour wheel has partially collapsed.)

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