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StuntDummy
Joined: 08 Aug 2007
Posts: 59
Location: San Francisco, CA
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| Posted: Wed Feb 09, 2011 8:50 am Post subject: Intermittent 1080p flicker on G70 |
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My blu-ray player is plugged directly to a Moome card (the HDMI/component one), and 1080i is fine, however when I switch the player to 1080p I get some flicker, but only at certain times. It really shows up when I am scrolling through the settings menu on the player. It seems to be caused by the white lettering (on a dark background) because as I scroll up/down, the picture (brightness?) pulses. Sometimes when I stop scrolling the pulsing stops and other times it does not (depending where I land). It seems like the screen is flickering when there is more text showing but it is hard to tell. I have also seen this flickering while a disk is playing. It happens only in certain scenes when the lighting in the scene gets brighter.
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ecrabb
Forum Moderator
Joined: 13 Mar 2006
Posts: 15909
Location: Utah
TV/Projector: JVC RS40, Epson 5010
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| Posted: Wed Feb 09, 2011 11:48 am Post subject: |
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Thats AKB (ABG on Sony). I'll try to post a link or two later, but if you search AKB or ABG and my username, you should find a couple of posts on exactly what you're describing.
SC
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StuntDummy
Joined: 08 Aug 2007
Posts: 59
Location: San Francisco, CA
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| Posted: Wed Feb 09, 2011 3:56 pm Post subject: |
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Thanks for the lead, I'll check it out.
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ecrabb
Forum Moderator
Joined: 13 Mar 2006
Posts: 15909
Location: Utah
TV/Projector: JVC RS40, Epson 5010
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| Posted: Wed Feb 09, 2011 4:11 pm Post subject: |
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No problem! I can't find my original thread where I first inquired about the problem... For me, it showed up really badly on the Dave Matthews and Tim Reynolds Blu-ray for some odd reason. But, here's the thread with a pretty lengthy discussion on AKB/ABG... That's your fix:
G70VR adventure...
I'm pretty sure this is when I switched from AKB on to AKB off and never had a problem with the brightness fluctuation 1080p again. Cliffy mentioned that possibly improper setup was causing the problem, but even after I re-did setup and the AKB line was well off the screen (and out of the active image area), I still had the brightness pumping. I turned off AKB, readjusted G2 to put my brightness control back in range, and never looked back.
2000 hours or so later, it's probably time to re-calibrate. I think I'm crushing some shadow detail that I wasn't before.
SC
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StuntDummy
Joined: 08 Aug 2007
Posts: 59
Location: San Francisco, CA
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| Posted: Wed Feb 09, 2011 4:53 pm Post subject: |
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What a coincidence, that Dave Mathews video is where I noticed too.
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daanbeo
Joined: 12 Oct 2010
Posts: 98
Location: netherlands
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| Posted: Wed Feb 09, 2011 5:02 pm Post subject: |
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wow that is a coincidence.
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ecrabb
Forum Moderator
Joined: 13 Mar 2006
Posts: 15909
Location: Utah
TV/Projector: JVC RS40, Epson 5010
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| Posted: Wed Feb 09, 2011 5:19 pm Post subject: |
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Yeah, that disc just went crazy for me... It must be something to do with the consistently low APL (performers on a stage with a mostly dark background) combined with occasional bright white highlights... Where the ABG seemed to really go wild was when there would be some hot reflections off the guitar bodies or chrome tuning pegs. Drove me bonkers until I fixed it!
SC
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StuntDummy
Joined: 08 Aug 2007
Posts: 59
Location: San Francisco, CA
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| Posted: Wed Feb 09, 2011 5:35 pm Post subject: |
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| ecrabb wrote: | ...here's the thread with a pretty lengthy discussion on AKB/ABG... That's your fix:
G70VR adventure...
I'm pretty sure this is when I switched from AKB on to AKB off and never had a problem with the brightness fluctuation 1080p again. Cliffy mentioned that possibly improper setup was causing the problem, but even after I re-did setup and the AKB line was well off the screen (and out of the active image area), I still had the brightness pumping. I turned off AKB, readjusted G2 to put my brightness control back in range, and never looked back. |
Well, I may be stuck here. I had to turn the ABG on to get the brightness up to a usable level, and I have the latest firmware so a G2 adjustment with ABG off is not an option.
It seems my last option is to check the vertical shift, as mentioned in G70VR adventure...
| r.bauer wrote: |
Brightness fluctuations during movies are often related a to wrong vertical shift position. In such a case the internal blacklevel is set to a wrong level. Ever so slightly adjusting Vertical shift solves this problem instantly.
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I hope it works...
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StuntDummy
Joined: 08 Aug 2007
Posts: 59
Location: San Francisco, CA
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| Posted: Wed Feb 09, 2011 8:39 pm Post subject: |
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I tried the vertical shifting suggestion to no avail, I even squeezed the picture down and moved it all over the tube, but still it flickers. So I decided to turn ABG off and try to get decent levels with the brightness and contrast controls. I had to max the brightness and set the contrast to 85 to get close to where I want to be, but the picture is still just a bit darker and contrastier (if that is a word) than I would prefer but I could live with it if I had to. However, it feels wrong to leave the settings that high since I have always tried to keep those settings low throughout the years, but I suppose the actual output is what is important as far as tube wear, and not the numbers, right?  I am still hoping another solution exists out there...
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ecrabb
Forum Moderator
Joined: 13 Mar 2006
Posts: 15909
Location: Utah
TV/Projector: JVC RS40, Epson 5010
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| Posted: Wed Feb 09, 2011 8:45 pm Post subject: |
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| StuntDummy wrote: | | but I suppose the actual output is what is important as far as tube wear, and not the numbers, right? |
Exactly. I know it seems scary, but the actual brightness (beam current) is what really counts.
In a way, I'm glad you had the same problem I did. I read Cliffy's and r.bauer's comments and felt like my setup wasn't right, but just like you, nothing I could do would make it go away. In my case, I was "lucky" enough to have the firmware with G2 controls... In your case, not so... I'd be in the same boat as you if I'd had a newer machine.
<shrugs shoulders>
SC
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jeffslife
Joined: 17 Apr 2010
Posts: 4190
Location: ohio usa
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| Posted: Wed Feb 09, 2011 10:52 pm Post subject: |
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Thanks again steve. Off to the basement I go.
_________________
We are ALL job creators !
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StuntDummy
Joined: 08 Aug 2007
Posts: 59
Location: San Francisco, CA
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| Posted: Wed Feb 09, 2011 11:41 pm Post subject: |
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I think I will try lowering my brightness and then raising the bias on all 3 channels when get home. Hopefully I can get a bit more overall brightness with a little range left over. I better remember to write down the original values just in case.  I don't know if this plan will work, but what the heck.
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StuntDummy
Joined: 08 Aug 2007
Posts: 59
Location: San Francisco, CA
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| Posted: Thu Feb 10, 2011 5:38 pm Post subject: |
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UPDATE: I'm happy again!
The bias adjustment worked. After setting the BRIGHTNESS to 80 and the CONTRAST to 50, I put up a pluge pattern and cut off two of the tubes. I then raised the BIAS of the lit tube until it's level was equal to black. After repeating the procedure for all 3 tubes I turned them all back on and what do you know, the gray scale looked really close. I put in a movie and it looked great, plus my brightness control is no longer maxed so I have some range to play with.  The bias adjustments were pretty big, (started in the 70's and ended up in the 200's) but fortunately there was enough range to get me there. Hopefully there are no unforeseen issues with running the values this high, but as it stands I now have a picture I like and flicker free 1080p!
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