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Hey,

I've been experiencing something quite wierd which I've never seen on projectors before, 3 dots - 2 in the middle of the screen, one next to the other, and one close to the bottom left corner.

Say this is my screen, the black circles are dots:



The dots seem much brighter from the rest of the screen, but my camera won't catch it.. I also see it in dark scenes, and even when no source is connected (the no signal screen).



Any ideas?
 

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As Adam said check the lens. With the projector off I'm betting you have specs on your lens. I have one on mine from when I remounted my projector. Some how a spec got inside the lens. It is only visible when it's searching signal when the screen is black. I don't see it when a movie is on. Maybe your specs are larger than mine.
 

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Quote:
Originally Posted by RLBURNSIDE  /t/1468694/benq-w1070-strange-dots#post_23216544


When I defocus (or re-focus to the lens itself) I also see some kind of specks on my image. I was going to try and wipe the lens clean with some kind of cleaner. Can anyone recommend one?

Would not use a cleaner at all, just plain water on a clean wash cloth that has no lint, perhaps some one else will chime in with a better answer, say look at the manual and see what they say to use.
 

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I tried water, it didn't work. I can clearly feel the bumps on the surface though, which is good news because all it means is that it's dust caked on due to the heat. Meaning I should be able to get it off. (though it's only really apparent when focused on it, I'm sure it does alter the projected image a little bit.
 

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Quote:
Originally Posted by RLBURNSIDE  /t/1468694/benq-w1070-strange-dots#post_23218398


I tried water, it didn't work. I can clearly feel the bumps on the surface though, which is good news because all it means is that it's dust caked on due to the heat. Meaning I should be able to get it off. (though it's only really apparent when focused on it, I'm sure it does alter the projected image a little bit.


Did you get a chance to look at the manual,page 47 it states on how to clean the lens.
 

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It says to use a professional lens cleaning brush and cleaning agent, but I have no idea where to buy that, they didn't appear to have that at Home Depot.


I tried some wipes and it didn't get the caked-in specks off. There's a big-ish one right in the middle of my screen, I'm sure it's costing me some clarity but it's being real stubborn. Maybe it's melted into the glass now, eek. It seems very much part of the lens now.
 

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Try a camera shop in your neighborhood and tell them what you you are looking for, do not have to get the best just something that will do the job for you.
 

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a lens cleaning cloth and or kit from your photo shop will do the trick.
 

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Did you ever fix your problem? I have one of these dots in the upper right hand corner of my screen, (only visible when image is very dark).
 

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Hello guys, 

I have the same problem from colleagues.

I cleaned the lens and even then the bubbles are still visible in darker images :-(

I got open the projector and clean it with compressed air but still did not work ...

I believe that the problem is inside the lens ...

Does anyone know any tutorial?

Thank you.
 
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