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Ile
Joined: 09 Mar 2006
Posts: 1491
Location: Jyväskylä, Finland
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| Posted: Thu Oct 15, 2009 8:48 am Post subject: |
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Maybe they leaved it from newer boards.
This is what switch (S1) does in 808.
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royuk
Joined: 28 Dec 2007
Posts: 41
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| Posted: Thu Oct 15, 2009 7:19 pm Post subject: |
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I think i may also have this pulsing issue on my 1209s.
Having taken a year to get it going after a previous problem i don't know if i can take any more!
After replacing splitter, quad and eht the pj was working well. Only thing is i haven't had time to use it much till now.
What i'm seeing is only happening with the green tube.
Going from an indoor low light scene, to a dark, outside night time scene really shows the problem.
The picture brightness pulses for a second or so before settling. Then on other scenes the low light level areas get brighter slightly, more subtle but noticeable.
Will check to see if i have the ABL switch and what affect disabling it has, but why is it happening now?
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Ile
Joined: 09 Mar 2006
Posts: 1491
Location: Jyväskylä, Finland
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| Posted: Thu Oct 15, 2009 7:32 pm Post subject: |
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| royuk wrote: | What i'm seeing is only happening with the green tube.
Going from an indoor low light scene, to a dark, outside night time scene really shows the problem.
The picture brightness pulses for a second or so before settling. Then on other scenes the low light level areas get brighter slightly, more subtle but noticeable.
Will check to see if i have the ABL switch and what affect disabling it has, but why is it happening now? |
120x series don't have abl switch.
This is also probably different problem, because it's only in green. Could be faulty neck board or tube related problem.
I'd swap red and green neck boards first to see if problem follows.
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royuk
Joined: 28 Dec 2007
Posts: 41
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| Posted: Thu Oct 15, 2009 7:47 pm Post subject: |
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Thanks Ile.
Thats why i can't find it on my vertical board.
I have a spare neck card so i'll give it a go.
Will have to wait until tomorrow now though.
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secstate
Joined: 20 Mar 2006
Posts: 720
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| Posted: Fri Oct 16, 2009 12:48 am Post subject: |
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Also double check to make sure it is only on green. I had pulsating brightness during changes in "brightness" levels between scenes. In my case it occurred on all three tubes of my Runco 1100 (Barco 1209s more or less). In my case it turned out to be the SMPS. It was most noticeable going from a brighter scene to a darker one and would only happen for a second or two until it stabilized. I also had a Barco with what now appears to have been an ABL problem (not my Runco) and it had random flickering there was no correlation to the on screen material.
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royuk
Joined: 28 Dec 2007
Posts: 41
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| Posted: Fri Oct 16, 2009 3:01 pm Post subject: |
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Thanks guys 
Problem solved. Changed the neck card and straight away the picture black level was much better.
Tried the same scene from Spiderman 3 blu-ray and NO pulsing. Just a great picture!
Another close one. Thought i was going to have to spend another small fortune or get rid of the 1209s.
It survives another day, for now 
Feel sorry for those that haven't got their pulsing problem fixed yet though. 
It really is depressing trying to get things fixed. Thats why it's so important to have forums like these.
Gives us hope 
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Rattanee
Joined: 18 Jan 2015
Posts: 193
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| Posted: Thu Feb 11, 2016 6:45 pm Post subject: |
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Sorry to raise such an old thread... but did anyone figure out what the problem affecting all three tubes was? I have the same problem, but I'd rather fix abl then disable it if there's a solution... Maybe just need to filter some noise from the abl lines?
_________________
Watching atm: Barco Cine 8 Onyx (HD-18 modded)
Working on atm: Barco 808s --> Cine8 Onyx conversion
Retired/shelved units: 2xNEC 9PG, 2xNEC 6PG Plus, Barco Vision 600, Sony VPH-1021
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gregstv
Joined: 27 Aug 2007
Posts: 628
Location: Australia
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| Posted: Thu Feb 11, 2016 8:40 pm Post subject: |
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This has been raised a couple of times lately. Has anyone checked for rail voltage drop when switching from black to white and back again? I don't see this on my 808s but I have added some cap to the 17V and the lower voltage rails on the switcher and driver boards. It could be ripple current on the op amps. But I could be wrong, just an idea.
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Rattanee
Joined: 18 Jan 2015
Posts: 193
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| Posted: Thu Feb 11, 2016 9:10 pm Post subject: |
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I don't think it's related to black-white transitions, it happens even if nothing is displayed and you just crank up brightness. You can actually see the raster flickering when you look into the lenses.
_________________
Watching atm: Barco Cine 8 Onyx (HD-18 modded)
Working on atm: Barco 808s --> Cine8 Onyx conversion
Retired/shelved units: 2xNEC 9PG, 2xNEC 6PG Plus, Barco Vision 600, Sony VPH-1021
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