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Dust Blobs I have dust blobs on the lens, and what appears to be a scratch or smudge, like somebody (I am the second owner) used a type of abrasive. Can you recmmend how to get rid of the dust blobs, and a cleaner to try and remove the smudge?

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SOURCE: i need to remove 2 blob dust in projector ptae2000

canned air. remove the top of the projector and blow out the dust from every nook and cranny.

Posted on Aug 19, 2009

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Viewsonic 5132 dust blobs

Most likely your DMD chip has dust or hair on it. You can try blowing it out with compressed air but the best thing is to tear down and clean the dmd chip itself. Very carefully. Here is a video of a similar unit. SO far all the DMD projectors I have worked on have had a very similar set up. Take pictures as you go.
MItsubishi XD206u DLP Projector Lens Assembly Cleaning

Mar 14, 2014 | ViewSonic PJD5132 SVGA 800x600 DLP...

1 Answer

Cleaning dust from inside of lens of NEC NP 100

I would try not to touch it much. Having a single smudge or finger print on the lens will look bad on the picture. just use a blow air can or blow on it. If need get a mico fiber cloth.

Feb 01, 2014 | NEC NP-1000 Projector

2 Answers

Spots on screen with epson moviemate25

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.

Jul 10, 2012 | Epson MovieMate 25 Multimedia Projector

1 Answer

Bubbles are projected on the screen

I am assuming that the "bubbles" are most prominant when the picture is dark. If that is the case, it is most commonly referred to as dust "blobs". Dust particles get on the lens assembly inside the projector and are just out of focus so they appear as blobs or bubbles. If you can carefully remove the cover and gently blow out the lens / color wheel area with compressed air it should reduce the "bubble" effect. I would not recomend any further dissasembly as it is complex and time consuming and unless your very careful, could end in disaster. Don't forget to clean the air filters either.

Aug 03, 2011 | Optoma EP721 Projector

1 Answer

There is dust inside the lens. how do I clean the dust from inside the lens?

Your projector needs little maintenance. The only thing you need to do on a regular basis is

to keep the lens clean.

Never remove any parts of the projector except the lamp. Contact your dealer if other parts

need replacing.

Cleaning the lens

Clean the lens whenever you notice dirt or dust on the surface.

• Use a canister of compressed air to remove dust.

• If there is dirt or smears, use lens-cleaning paper or moisten a soft cloth with lens cleaner

and gently wipe the lens surface.

Never rub the lens with abrasive materials.

Nov 27, 2010 | BenQ MP623 DLP Projector

1 Answer

The projector turns on to a blue screen for about 5 seconds and then switches to the red light bulb dot. i heard there could be a problem with the color wheel from someone?

When the color wheel starts to go out, what happens is the picture will usually be very faint and pulsate with no color (just black and white). This will last for about 10 to 20 secs then the projector will shut off. If you have a clear picture then it could be your lamp. Need more info. Does the projector shut off after the red light appears? Also you can pull the lamp out and clean the contacts with electrical contact cleaner which can be bought online or at your local radio shack. Pick up some denatured alcohol while you are there. While your lamp is out, use compressed air to blow out dust and debris from the fans and color wheel. You can clean one side of the color wheel very easily while the lamp is out. Use a q-tip with the denatured alcohol. Wipe from the middle towards the outer part gently. If you do it at a slight angle you can turn the wheel while you clean it. To clean the other side requires removal of the outer casing. Make sure your lens is clean as well. Use the compressed air to remove dust/debris from it. If you notice smudges on the lens, you can clean it with the denatured alcohol. Do not use any other type of cleaner on it and use a very soft cloth, preferably one made for cleaning plastic eye glasses. Be very gentle as the lens can easily be scratched. A build up on the lens can cause the error you described as well. If you are able to get into the menu, check and make sure your lamp hours are not maxed out. If they are reset the counter.

Oct 14, 2010 | Optoma HD65 DLP Projector

2 Answers

Professionally clean a three year old liesegang dv 560

LCD are very septable to dust thats why they use filters where most DLP dont. These lamps get so hot that smoke and other things in the air can cook inside the unit.

These things use mirrors and lenses and some use light disipators so smoke can really affect their brightness over time.

DLP units use a spinning wheel and they dont seem to have as much of a problem with dust blobs like LCD but i would guess smoke can still darken their images over time as well.

Jun 28, 2010 | Liesegang dv 560 flex LCD Projector

1 Answer

HD70 DLP Projector: The projector is used and about a year old. It cur...

Did this start occurring after you replaced the lamp?

The reason I ask is I had the same issue after changing the lamp and it was caused because when I took out the old lamp I noticed dust in the lamp housing which I attempted to blow away.

This caused the problem because some dust got further into the projector, specifically around the color wheel. I sorted it out by taking the projector apart following the instructions here:

(note my HD70 was out of warranty, if yours is not, I would recommend contacting Optoma to get it fixed).

Follow the above instructions to step 14 and then locate the color wheel which is at the front of the projector behind a dark gray, plastic type square shaped cover.

You have to be very careful here, but remove the color wheel (there is one screw holding it in place) - note it

May 18, 2010 | Optoma HD70 DLP Projector

1 Answer

Vp800 LCD Projector has dark blob on display.

blow out any dust with canned air. chances are there is an object blocking the image. or there is a crack or burn spot on the 2nd fly-eye lens (diffuser). the first one is right next to the lamp (if you remove the lamp, you'll see it). the second is right on the other side of it.

Jul 14, 2009 | Multimedia Projectors

1 Answer

Hair inside optoma hd70 lense

I had an issue with "dust blobs" on my HD70 and was unable to locate instructions or a tutorial on how to remove them. I figured maybe this could help you if the hair is located within the same location as the dust. Please check out my blog at for instructions on how to remove dust blobs from a HD70 as this process worked perfect for me and I no longer have these annoying spots when watching movies!!

Jan 26, 2009 | Optoma HD70 DLP Projector

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