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post #1 of 7 Old 03-11-2020, 03:21 PM - Thread Starter
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White spots on projector?

Hey

I just bought a BenQ 1080ST off eBay. Unfortunately I noticed these big white spots on darker scenes and when the screen turns black. I cleaned the front of the lens but it didn't change anything. I also tried switching rooms, still the same.

Warranty is way gone.

It looks like something is dirty inside the projector.

See attached images.

How can I fix it?
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post #2 of 7 Old 03-11-2020, 09:12 PM
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Quote:
Originally Posted by gazoome View Post
Hey

I just bought a BenQ 1080ST off eBay. Unfortunately I noticed these big white spots on darker scenes and when the screen turns black. I cleaned the front of the lens but it didn't change anything. I also tried switching rooms, still the same.

Warranty is way gone.

It looks like something is dirty inside the projector.

See attached images.

How can I fix it?
Those look like dust spots. If you focus/refocus the image, do the spots focus/refocus as well?

Might want to try High Altitude mode for a little while.

If not, it will have to be cleaned. Benq can do it for a relatively small cost, or you can do if you feel confident.
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post #3 of 7 Old 03-11-2020, 09:38 PM
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Defiantly looks like dust in the optical block. I am willing to bet someone attempted to clean the dust out of the projector with compressed air without disassembling the projector. This usually results in forcing more dust into the optics. To fix the projector needs to be dissembled and cleaned out, not for those not familiar with delicate electronic connectors.

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post #4 of 7 Old 03-18-2020, 01:14 PM - Thread Starter
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Thanks noob00224 and rekbones for your answer.

BenQ has gotten back to me with a price for cleaning, which is almost as much as I paid for the entire projector with a new lamp. Their turn-round times are also slower than usual due to the virus outbreak.

Is this not something I can do myself?

I've noticed some dust spots also appears outside the image area.
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post #5 of 7 Old 03-18-2020, 01:26 PM
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Quote:
Originally Posted by gazoome View Post
Thanks noob00224 and rekbones for your answer.

BenQ has gotten back to me with a price for cleaning, which is almost as much as I paid for the entire projector with a new lamp. Their turn-round times are also slower than usual due to the virus outbreak.

Is this not something I can do myself?

I've noticed some dust spots also appears outside the image area.
These projectors are roughly the same.

Starts at 8:58:

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post #6 of 7 Old 03-21-2020, 06:56 AM
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I thought I read some where that one of the advantages of DLP projectors is that they are not as prone/ affected by dust blobs as opposed to LCD types like the Epsons?
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post #7 of 7 Old 03-21-2020, 02:26 PM
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I thought I read some where that one of the advantages of DLP projectors is that they are not as prone/ affected by dust blobs as opposed to LCD types like the Epsons?
They are less prone, but DLP light tunnel is not 100% sealed.
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