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white and black spots on the projected image

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Old 3rd July 2011, 06:31 PM
 
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white and black spots on the projected image


Hi,

I have an Optoma DLP Projector( DW318 bought in UK 6 months back ) at home for movies. The projector has been good but recently white and black spots started appearing in the image and off late the spots are increasing. I think it is to do with dust particles as there is a road close by which runs along our house. I have tried cleaning the external lens but it doesn't help. Opened up the projector and tried cleaning the lens /glass within the bulb even that didn't help.

I need help on cleaning the dust - on the tools(i.e compressed air blower), methods, etc

Is there any place in Chennai where i can get it serviced (cleaned) ?

Thanks
Srini
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  #2  
Old 4th July 2011, 09:10 AM
 
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Re: white and black spots on the projected image

Its sad to hear of your plight in just within 6 months of purchase! I always thought that DLP projectors are immune to dust but it seems this is not the case for Indian conditions.
Its possible that dust has entered optical block (which houses color wheel). I would not recommend opening and cleaning that yourself. Please get in touch with Optoma people, they may be able to point you to right service destination.
Its possible that specks of tar/carbon from road smoke has gotten stuck on lens etc. It will not be possible to clean it through simple wiping or air blow. It may need some cleaner to get it out.
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Old 8th July 2011, 06:55 PM
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Service Center

In such a situation the lesson to learn would be, keep the projector covered at all times with double cloth and keep windows closed at the time of watching a movie or consider a projector lift, but it will be quite a expensive situation as the false ceiling also will have to be done, etc.

In general nothing is immune to anything if not handled well, be it the Indian or American soil.

It is any day wise that the authorised service center handles the projector then we making attempts to straighten it, based on our maybe filmy imaginative view that so and so thing must have happened by which the projector is not working in order.

V.
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Old 9th July 2011, 09:33 PM
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Re: white and black spots on the projected image

They may not be dust spots but something else. But dust protection is a must for projectors. That is one reason why I have not ceiling mounted my projector. I have it placed over a high bookshelf where it is in easy reach. It is always covered by a cloth when not in use. Last 5 years - no issues so far - touchwood.

Get the PJ serviced from a known person.
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Old 9th July 2011, 11:57 PM
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Re: white and black spots on the projected image

dust blobs on the color wheel do not appear totally black, those appear more like a dusty, blurry part on the screen. If its too dark, then it may be something stuck on the lens.
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Old 10th July 2011, 02:05 PM
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Re: white and black spots on the projected image

Quote:
Originally Posted by Vinay
or consider a projector lift
Hello Vinay,

Can you please elaborate a little bit on this if you have the time ? I am quite interested in knowing how this is done and the costs involved.

Regards,

Sunil
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Old 10th July 2011, 02:38 PM
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Re: white and black spots on the projected image

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Originally Posted by ssf View Post
Hello Vinay,

Can you please elaborate a little bit on this if you have the time ? I am quite interested in knowing how this is done and the costs involved.

Regards,

Sunil
A projector lift is a device that hides the projector in the false ceiling (FC). Normally the PJ is well concealed inside the FC. When you start it, a square panel of the FC comes down guided by telescopic rails and a lift motor. The lift is programmed to bring down the projector below a specific height. Once done, when you switch off, the lift lifts the PJ back into the ceiling. The ceiling appears completely plain now.

You can google it.
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Old 10th July 2011, 04:44 PM
 
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Re: white and black spots on the projected image

How does using PJ lift protects against dust? Doesn't dust gets inside false ceiling too?
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Old 10th July 2011, 04:49 PM
 
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Re: white and black spots on the projected image

Quote:
Originally Posted by manoj.p View Post
dust blobs on the color wheel do not appear totally black, those appear more like a dusty, blurry part on the screen. If its too dark, then it may be something stuck on the lens.
You are right! Any spot on color wheel will not be stationary on screen but will be a blur because of motion of color wheel. I didn't think of that before
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Old 10th July 2011, 09:14 PM
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Re: white and black spots on the projected image

Quote:
Originally Posted by rshri View Post
How does using PJ lift protects against dust? Doesn't dust gets inside false ceiling too?
It will minimize the dust issue. But yes, you are right. It cannot get rid of dust issue totally. You will still require (lesser) cleaning every month or two.


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