DLP projector posterization issue : need help - AVS Forum
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post #1 of 8 Old 08-10-2014, 08:50 AM - Thread Starter
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DLP projector posterization issue : need help

Hi,

I seeks some help and suggestion fixing my Infocus IN82 DLP projector. This issue affected many users of the Infocus IN80/IN81/82/83.
The issue is dicussed in detail in the owners thread here

Infocus X10/ IN80 Owners thread - Reviews, Settings, Screenshots and issues

In summary, after few months of use, the image shows up murky and blotchy colours on dark skin tones or red / green tones. Initially it affects dark scenes with mostly red tones, but later it stars affecting al colours even in bright scenes.

The exact reason is not fully understood in that thread and Infocus is not going to fix it out of warranty. In my case Infocus replaced 5 units on the same defect, but they never fixed it or bothered.

Here's what is found in most cases on this particular issue
1. Initially starts with posterised red and green tones
2. On turning Brilliant color on - it goes away (not sure why)
3. After some time turning on BC reduces the issue greatly but not eliminate it completely
4. With more time the issue becomes worse and even with BC on it becomes unusable
5. Initial 2-3 min of turning on the issue is not visible, but shows off after that - heat??

The projector without the posterization issue is excellent, but not usable now as it affects the image too much now.

The reason I am posting this here is initially I thought it was affecting mostly Infocus In8X range, but later saw some other sites where people have reported similar issues on Optoma DLPs as well. I just thought posting here may get me and some owners some help from a wider DLP community.

I'd appreciate if anyone can help with the issue and if you ahve faced something like this, what you did to get rid of.

Buying a new PJ is a easy choice, but I am not able to just throw it away without giving it a try to fix.

Here's a couple of files with both BC off (see issue with red and dark skin tones) and BC on (issue gone or reduced)
Attached Images
File Type: jpg 8BCon.jpg (328.7 KB, 37 views)
File Type: jpg 8BCoff.jpg (339.4 KB, 32 views)
File Type: jpg 5BCon.jpg (321.1 KB, 27 views)
File Type: jpg 5BCoff.jpg (328.0 KB, 21 views)
File Type: jpg 4BCon.jpg (373.5 KB, 20 views)
File Type: jpg 4BCoff.jpg (374.3 KB, 22 views)
File Type: jpg 3BCon.jpg (392.6 KB, 20 views)
File Type: jpg 3BCoff.jpg (399.0 KB, 17 views)
File Type: jpg 9BCon.jpg (333.5 KB, 18 views)
File Type: jpg 9BCoff.jpg (326.0 KB, 16 views)
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post #2 of 8 Old 08-10-2014, 12:41 PM
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Looks like what used to be called solarization. I would guess it could be caused by dust on the color wheel or by a timing issue which might be caused by dust on the color wheel if the color wheel sync is not by magnet, or could be caused by poor contact on a contector or ribbon cable connector in the machine or a fault on the motherboard causing a problem with something like the lower voltage differntial.

I think all you can do is clean the color wheel and the cable connectors, maybe take the lid off and redo the ribbon cable connections inside to make sure they are clean and making good contact, and hope for the best. Note if you clean any of the optics do not use any chemicals as you can destroy the ant-reflective optical coatings. If it is the motherboard I would think you are screwed.

Last edited by dovercat; 08-10-2014 at 12:51 PM.
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post #3 of 8 Old 08-10-2014, 04:28 PM
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Planar 8150 had similar issues and was color wheel timing. Using the service menu and internal color step patterns I was able to fix it by adjusting the color wheel timing.

You may also want to do a factor reset on any calibration settings just to make sure something is not pushed to far and causing bit loss. I would think not since it comes and goes.. may be a component on a board someplace or connector as was suggested.
Good luck!
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post #4 of 8 Old 08-10-2014, 06:40 PM
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I called Infocus about this issue when I was thinking about buying an IN83 and they said it was due to dust build up and overheating. They said, in particular, the housing around the bulb needs to be cleaned thoroughly. Mine is 6 years old and so far shows no signs after a lot of use but I do clean it once a year and only use with the AC on.
Certainly with processors if they overheat a couple of times they tend to be more prone to overheating in general. Not sure if the same thing is happening with DLP chips or whatever controls the colour wheel.

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post #5 of 8 Old 08-12-2014, 08:54 AM
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Quote:
Originally Posted by danieledmunds View Post
I called Infocus about this issue when I was thinking about buying an IN83 and they said it was due to dust build up and overheating. They said, in particular, the housing around the bulb needs to be cleaned thoroughly. Mine is 6 years old and so far shows no signs after a lot of use but I do clean it once a year and only use with the AC on.
Certainly with processors if they overheat a couple of times they tend to be more prone to overheating in general. Not sure if the same thing is happening with DLP chips or whatever controls the colour wheel.
Curious if your IN82/83 is ceiling or shelf mounted?
Reason for asking is that there are 2 intake vents on the bottom of the case where if shelf mounted on just the rubber nubs, there is very little space for airflow.

Does "source" make a difference on your PJ?
I notice the posterization on local & cable/satellite channels, but Brilliant Color seems to fix it. Never encountered the issue on "Casino Royale" or "Oblivion" blu-rays. But posterization did appear during "This is the End" blu-ray. (terrible movie), and Hobbit #2 that was streamed from Directv.

Finally, Brilliant Color: Is it software, or an optical (physical) adjustment to, say, the color wheel speed?

**Edited to read "posterization" and not "polarization". Guess that's better than "pasteurization".

Last edited by David44; 08-13-2014 at 06:06 AM.
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post #6 of 8 Old 08-12-2014, 09:32 AM
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Brilliant Color changes the timings DLP to the color wheel. With Brillian Color engaged the DLP chip uses spoke time on a RGB wheel or the clear white segment on a RGBW wheel or changes how colours are created as far as using secondaries and primaries on color wheel with one or more secondaries like a RGBYMC wheel.
TI paper explaining Brilliant Color http://www.eefocus.com/data/07-01/11...1168591126.pdf

Last edited by dovercat; 08-12-2014 at 09:51 AM.
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post #7 of 8 Old 08-12-2014, 05:50 PM
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Quote:
Originally Posted by David44 View Post
Curious if your IN82/83 is ceiling or shelf mounted?
Reason for asking is that there are 2 intake vents on the bottom of the case where if shelf mounted on just the rubber nubs, there is very little space for airflow.

Does "source" make a difference on your PJ?
I notice the polarization on local & cable/satellite channels, but Brilliant Color seems to fix it. Never encountered the issue on "Casino Royale" or "Oblivion" blu-rays. But polarization did appear during "This is the End" blu-ray. (terrible movie), and Hobbit #2 that was streamed from Directv.

Finally, Brilliant Color: Is it software, or an optical (physical) adjustment to, say, the color wheel speed?
Its ceiling mounted with a about half a foot behind it for airflow.
I wouldn't say that source makes that much difference, I had a PS3 hooked up to it and now a mac mini and as long as the projector was calibrated, posterisation wasn't a problem. What I have found is that it can't quite be calibrated perfectly, there seems to be slight errors in a few shades of blue but wouldn't describe it as posterisation.
I do see posterisation on my cable box but I also see that with other displays, probably just errors in the signal.

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post #8 of 8 Old 08-27-2014, 04:30 PM
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Quote:
Originally Posted by anirbana View Post
Hi,

I seeks some help and suggestion fixing my Infocus IN82 DLP projector. This issue affected many users of the Infocus IN80/IN81/82/83.....

OP - any updates on your end? Thanks!
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