Question about BenQ MP623 DLP Projector

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

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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.

Posted on Nov 27, 2010

  • 1 more comment 
  • Jose Rommel Racimo
    Jose Rommel Racimo Jan 18, 2013

    Is it really the lens that has dust or the projected images has many tiny dots that grow in numbers? If it is, it must be what technicians call bubbles. This is due to improper uplugging of power cord while the unit is still automatically cools down. The electricity stored in some capacitors goes back to the part of the lens which produces those dots they say. I have the same problem too, and the whole module of that damaged part needs replacement.

  • gmontgome595
    gmontgome595 Dec 19, 2013

    1076-6329w is the dmd chiphttp://www.youtube.com/watch?v=xah9IW0OC...

  • gmontgome595
    gmontgome595 Dec 19, 2013

    is a video showing lens cleaning.

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Posted on Jan 02, 2017

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  • 269 Answers

SOURCE: dust inside lens...

this can be a doozy, but if you are up to it, remove the top cover, you may have to remove the rear, front and maybe sides, i don't know, but what you are after is the cover over the top of the lens. take that off and use air to blow it out--don't touch anything, just blow. several bursts then quickly replace the cover over the lens assy. if used in a dusty environment or ceiling mounted, you may have to do this as needed.

Posted on May 24, 2010

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1 Answer

How can i clean the inside of the lens as there is dust on the inside


Hi Pat, normally dust inside a lens will not affect the image quality. If it does , then really it needs to go to a service centre to be striped down and cleaned. I would imagine this is a zoom lens, as the moving parts in a zoom lens can cause dust to enter the lens.

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Cleaning the lens from the inside is not possible from a practical point of view. However, if you don't care that your camera won't work after you've taken it apart but you just want to see what's inside, then go ahead. If you see dust inside the lens and this is what is concerning you, please know that all lenses have dust inside...it can't be totally eliminated. In 99.999% of cases, the dust doesn't show up on the actual pictures.

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Can i clean fujifilm HS10 inside lens. There is one tiny dust inside the lens. How to clean. Please Advise.


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Almost all lenses get dust inside them. It's rarely bad enough to affect image quality in the slightest so is usually ignored.

The only fix is to pay to have a Sony service centre strip down the lens, clean it, and reassemble it, but it would be far cheaper to sell yours and buy a new example. Either way, unless you never take the lens out of the packaging it will soon get dust inside it again.

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How do I clean dust inside the camera? I noticed some splotches on my photos, then looked closely at the lens and it appears there is dust on the inside of the lens.


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Unscrew the entire lens assembly from the body. The inner lens cannot get debris inside it but the outside of it and the inside of the protector lens can. It's a good idea to do this cleaning in your bathroom with the shower on hot but not visibly steamy as this will cut the airborne dust by 90%.

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http://www.televue.com/engine/page.asp?ID=143

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1 Answer

Cleaning dust and dirt from the lens (inside)


Hi Nutty Prof

You will have to open up the unit by unscrewing the screws at the bottom and taking off the top cover of your PB6100.

Right behind the lens is the Lightengine ( where the dust collects )

Take off the cover of the Lightengine by unscrewing the two screws at the top of it . Then blow out the inside of the light engine with Air in a can ( available from most good PC shops )
and then reassemble.

If the dust particles still show after this ( which I doubt it will ) then you will have to take it to a Service Centre to get cleaned out as you will not be able to reassemble the lens once taken apart - it is a HUGE job !

Thanks for using Fixya and Good Luck !

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