Question about 3M MP 8640 Multimedia Projector

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Purple Specks on Screen

There are purple specks that show up on the screen that appear to be dust but I opened the unit and have no idea how to clean it.

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  • larryoke Mar 26, 2009

    Purple specks on the screen realise now that the lens unit needs to be cleaned but no idea how to remove it



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Hi. I have the same problem. I `ve cleanned the lens and the lamp, but the problem still. I think is oxide on the lamp. It needs to be replaced.

Posted on Nov 29, 2009

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Is there a guide for how to do this?

Posted on Jun 13, 2008



Posted on Nov 26, 2007

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Posted on Jan 02, 2017

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1 Answer

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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.

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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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NEC LT260 has White specs on Screen

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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1 Answer

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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 ...

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1 Answer

Dirt speck

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.

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1 Answer

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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.

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1 Answer

Red specks on screen always in the same spot

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

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