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If you see White or Blue specks that don't change no matter what you have on the screen they are dead pixels. Assuming the screen is clean and free of dust. There isn't anything you can do about dead pixels except have the screen replaced.
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)
Replace the cyan drum unit. If the specks are always in the same line there is small ding in the drum. If the specks are random then the cleaning blade inside the drum unit is bad. When ever the defect is just one color it usually is that color drum unit.
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: http://www.flickr.com/photos/todbot/81868083/in/set-1749030/
(If you get any dark shadows at the edge of the screen then the light tunnel between bulb and colour wheel has partially collapsed.)
The CCD seems to be the problem .... if you are good at disassembling electronic products open the camera .... remove the ccd blow out any dust using a soft hand blowing brush..... and refit the CCD properly and securely ... it shud solve the problem ...
It is probably a speck of dust on the sensor. Get a blower from any camera shop, remove the lens,lock up the mirror (mirror lock up in camera menu) and give the sensor a good blow ( without touching it) while holding the camera front down so that any specks of dust fall away from the sensor. Sometimes specks can stick (pollen for example) in which case you could try a disposable swab and cleaning solution, although if unsure most camera shops provide the service pretty cheap - the sensor would be a lot more expensive to replace if you mess it up.
The view finder and focusing screen are separate from the CCD sensor. The mirror reflects the image to the view finder until you take a picture. Then the mirror goes up, the shutter opens to expose the CCD to capture the image.
If you have a lot of dust, you should look into a cleaning kit, or have it professionally cleaned. This will show up on your images as white and/or black specks.