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Author
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Topic: Sony Srx-515 Discoloration
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Michael Kurtzke
Film Handler
Posts: 45
From: Ashburn, VA, USA
Registered: Feb 2013
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posted 05-11-2015 10:44 PM
Over the past few months, I've had to replace the T-Cores on all of my Sony 515's.
While I've noticed that colors drifted slightly overtime [mainly due to lamp age], a quick re-shoot with our Minolta CS-100A would fix the issue 95% of the time.
But around 12,000 hours, everything starts to go a little crazy, but only in the dark parts of the image. The Grey 10 and 8 test patterns look fine, but grey 2 is just an awful mess.
Take a look at what I walked into this morning in one of my auditoriums [Mind you, it looked perfectly fine on Friday]
That is not the worst one I've seen. Take a look at this:
And here's what it looks like with a 3D Lens on [It's a 3D House]
Has anyone else with a 515 seen this issue? It's a little bothersome that we have replaced the T-Core in now all of our 515's. Some of them have been replaced two or three times.
I love the contrast ratio on these guys, but this makes me wish we just had 320's in all of our houses.
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Carsten Kurz
Film God
Posts: 4340
From: Cologne, NRW, Germany
Registered: Aug 2009
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posted 05-12-2015 03:59 AM
quote: Michael Kurtzke
"TEST MODE" is fine.
You mean 'Test Mode' looks smooth, but projecting DCPs or grey test patterns delivers these blotchy images? That's weird and sounds like a complete mess in the gamma/uniformity correction tables. Test Mode doesn't use these tables. Sounds as if the last correction had been applied before cleaning or T-Core swap, and now 'bad' corrections or 'over corrections' are in place. Maybe someone restored the corrections for the old T-Cores in the new ones, or the LPD-7 boards were swapped back (these contain the correction tables)? You should try to reset uniformity tables first. Normally one would say: backup the old ones before, but in this case backing up crap seems like a useless waste of time ;-)
Who did recommend/supervise swapping the T-Cores? Were there attempts to clean or do uniformity corrections before that? If this could have been solved by cleaning or uniformity corrections, why was the more expensive T-Core swap performed?
Good last Friday, now it looks like that? I can hardly believe this is possible over a weekend, maybe there was a glitch and corrections tables were reset?
Of course it is possible that the previous T-Cores were bad, but if Test Mode now looks smooth, the new ones still seem to be perfect. Just the wrong corrections in place.
- Carsten
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Michael Kurtzke
Film Handler
Posts: 45
From: Ashburn, VA, USA
Registered: Feb 2013
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posted 05-12-2015 02:22 PM
quote: Carsten Kurz
Good last Friday, now it looks like that? I can hardly believe this is possible over a weekend, maybe there was a glitch and corrections tables were reset?
And this is where it gets 'fun'. This is our 8th time replacing a T-Core on a 515 at this site.
Before swapping the T-Core, Sony has sent technicians to do a full cleaning of the projector. When that didn't solve anything, they would replace everything in the light path [XDM, P/S Converter, RGB Filters on the T-Core, Lens, LPD-7, SY-401, etc.] and then perform a gamma/uniformity correction.
Even after all that, it would either 1) not resolve the issue and we would install a new T-Core, or 2) it would 'fix' the issue, but it would start to come back within a week or two.
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Carsten Kurz
Film God
Posts: 4340
From: Cologne, NRW, Germany
Registered: Aug 2009
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posted 05-12-2015 02:34 PM
Can you confirm that test-mode is clean, and only various grey-patterns blotchy? Of course, that would rule out any optical components (filters, dirt, etc.), Hard to believe the LCOS panels could have nonlinearities like this - 100% smooth at full white, but blotchy with anything below full white....?
I do have some experience with analyzing discoloration on the 515/510, but so far it was only a cleaning or uniformity issue, and only minor discoloration anyway.
How old are these machines? Serial numbers?
Ours is two years old, very early model, but does only one show a day, and with only 2*450W running (2D only). All discoloration so far I have seen on this and other 515s was caused by dust on specific areas of the color-filters and mirrors, caused by a suboptimal laminar airflow around the edges of these filters. Depending on environment and operating time, this would occur sooner or later but could always be solved by cleaning, and/or doing uniformity.
I hope this is not history repeating...how could Sony possibly continue to serve that market with panels that are not stable?
The old PCAT saves uniformity and gamma correction values as readable CSV files. It's easy to open them up in EXCEL and actually recognize the correction patterns visually. Don't know if the new PCAB-U/G allows this.
- Carsten
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