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keldor
Joined: 04 May 2007
Posts: 32
Location: Waterloo Ontario
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| Posted: Wed Apr 16, 2008 3:29 pm Post subject: Annoying brightness flicker on BG808 |
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I have a minty Barco BG808 vintage 1996 with 143 hours on it now. We watched out first BluRay movie this past weekend and it was spectacular. We also have been watching SD and HD TV through a SA 3250HD set top box. That also works great. (except see below)
Signal path:
Samsung BD player >
SA HD settop box > Monoprice HDMI switch > 35ft 22ga hdmi to dvi cable > HDFury > Port 3
Everything set to 1080i.
All is wonderful except when we watch HD hockey games. I know if I was reading this I wouldn't believe it but there is something about hockey that causes very noticeable short duration brightness spikes. This only occurs when most of the screen is filled with ice. It is for sure related to video content. The spikes do not occur when picture is zoomed in on players or any other time during the broadcast when the picture is not mostly the ice surface. Even more bizarre is if I hit the adjust button a fill half the screen with Barco menu stuff I still can see this flickering going on with the broadcast but the menu is rock solid. I have searched the forums but I cannot find an answer. Unfortunately I do not have an alternate way of connecting to the Barco. The obvious check would be run the component output of set top box into the Barco but I do not have a component to RGBHV converter. Any suggestions?
Thanks,
Steve
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"It is far better to grasp the Universe as it really is than to persist in delusion, however satisfying and reassuring." Carl Sagan
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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 Apr 16, 2008 3:33 pm Post subject: |
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I'm not a Barco guy, but perhaps it's a clamp or sync setting? Are there any settings you can configure on port 3?
SC
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kal
Forum Administrator
Joined: 06 Mar 2006
Posts: 18114
Location: Ottawa, Canada
TV/Projector: JVC DLA-NZ7
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keldor
Joined: 04 May 2007
Posts: 32
Location: Waterloo Ontario
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| Posted: Wed Apr 16, 2008 4:32 pm Post subject: |
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| ecrabb wrote: | I'm not a Barco guy, but perhaps it's a clamp or sync setting? Are there any settings you can configure on port 3?
SC |
There are no "menu" settings I see that are specific to Port 3. Perhaps there are hardware setting on the board?
| kal wrote: | What exactly do you mean by "Brightness Spike"? What exactly is the problem you're seeing?
Some cheap analog switchers (not the one you're using) can sometimes drop sync when there's a quick peak flash of light on screen - maybe it's something similar?
Kal |
It is difficult to explain but they appear as "instantaneous" flashes of increased brightness. They happen randomly and are definitely tied to the video content. On uninterrupted wide angle play the flashes happen every 10 to 15 seconds. At brightness and contrast settings way below normal they actually become more visible ans seem to be concentrated on the lighter portions of the image.
There is another diagnosis I can try tonight. I can run the output of the HDFury into a vga monitor and determine if it's the Barco or the rest of the equipment. Good thing there is hockey on every night!
Thanks,
Steve
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"It is far better to grasp the Universe as it really is than to persist in delusion, however satisfying and reassuring." Carl Sagan
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kal
Forum Administrator
Joined: 06 Mar 2006
Posts: 18114
Location: Ottawa, Canada
TV/Projector: JVC DLA-NZ7
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| Posted: Wed Apr 16, 2008 5:01 pm Post subject: |
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| keldor wrote: |
There is another diagnosis I can try tonight. I can run the output of the HDFury into a vga monitor and determine if it's the Barco or the rest of the equipment. Good thing there is hockey on every night! |
Good idea. Better get it done fast as the amount of hockey will likely die down after the Senators lose tonight. 
Kal
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Ile
Joined: 09 Mar 2006
Posts: 1491
Location: Jyväskylä, Finland
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| Posted: Wed Apr 16, 2008 5:11 pm Post subject: |
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Protection circuit (ICBL) drop contrast when it senses that cathode runs too high (white ice in picture). Sources too hot output can cause this (probably not in this case) or maybe you have too high contrast setting. Try lowering contrast with hockey games and see if flickering goes away.
If that doesn't help, then it could be ABL related.
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keldor
Joined: 04 May 2007
Posts: 32
Location: Waterloo Ontario
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| Posted: Wed Apr 16, 2008 7:59 pm Post subject: |
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| Ile wrote: | Protection circuit (ICBL) drop contrast when it senses that cathode runs too high (white ice in picture). Sources too hot output can cause this (probably not in this case) or maybe you have too high contrast setting. Try lowering contrast with hockey games and see if flickering goes away.
If that doesn't help, then it could be ABL related. |
I have played with contrast and brightness settings and they seem to have no affect on the flickering. If I do determine for sure that the problem is within the projector I will follow up with you on the ABL thing.
Thanks,
Steve
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"It is far better to grasp the Universe as it really is than to persist in delusion, however satisfying and reassuring." Carl Sagan
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picree
Joined: 31 Mar 2006
Posts: 351
Location: Johnson City, TN
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| Posted: Thu Apr 17, 2008 1:12 am Post subject: |
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Sounds stupid but...have you considered that the flashes could just be fans taking flash photography pictures?????? 
_________________
MAIN THEATER: (JVC RS2000; Yamaha UDP-LX500; Yamaha RX-V2400; Lumagen Radiance Pro, Vertex)
SECOND WII-ATER: (BG808; WII; Oppo 971H; Moome external box; BG-DVI transcoder; tse gamma box; Extron)
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RUSerious
Joined: 09 Feb 2007
Posts: 9
Location: Ottawa Area of Canada
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| Posted: Thu Apr 17, 2008 12:52 pm Post subject: |
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| kal wrote: |
Better get it done fast as the amount of hockey will likely die down after the Senators lose tonight.
Kal |
Then and Now
"Go Sens GO!" "Gone Sens GONE!"
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keldor
Joined: 04 May 2007
Posts: 32
Location: Waterloo Ontario
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| Posted: Thu Apr 17, 2008 2:44 pm Post subject: |
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| picree wrote: | | Sounds stupid but...have you considered that the flashes could just be fans taking flash photography pictures?????? |
Well, It's not stupid because I have been wrestling with that possibility myself. I don't think so. The flashes do not appear as points of light. The light areas of the whole picture seem to flash brighter.
I did not get much time to work on it last night but I did get the HDFury output connected to a VGA input of a lcd projector. I'm pretty sure the flashing is still there. Due to cable length issues I wasn't able to fire the lcd projector at the screen. It was projecting on to the side wall of the theater (dark grey). I'm now thinking it is an HDFury issue?
Anyway this lcd projector has component inputs so I can take the HDFury out of the equation. Immediate problem is component inputs on the LCD unit are BNC so I need get some rca to bnc adapters to try it.
Thanks,
Steve
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picree
Joined: 31 Mar 2006
Posts: 351
Location: Johnson City, TN
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| Posted: Thu Apr 17, 2008 11:25 pm Post subject: |
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Certainly at any other sporting event flashes would appear localized but it could simply be reflecting off the ice. Long digital cables can sometimes produce "sparkles" but it doesn't sound like what your are describing.
_________________
MAIN THEATER: (JVC RS2000; Yamaha UDP-LX500; Yamaha RX-V2400; Lumagen Radiance Pro, Vertex)
SECOND WII-ATER: (BG808; WII; Oppo 971H; Moome external box; BG-DVI transcoder; tse gamma box; Extron)
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keldor
Joined: 04 May 2007
Posts: 32
Location: Waterloo Ontario
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| Posted: Fri Apr 18, 2008 1:14 pm Post subject: |
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| picree wrote: | | Certainly at any other sporting event flashes would appear localized but it could simply be reflecting off the ice. Long digital cables can sometimes produce "sparkles" but it doesn't sound like what your are describing. |
 Yes, it is simply photo flashes. Sorry for the unnecessary consumption of bandwidth! Perhaps we can pretend I never mentioned it.
32" SD hockey is what I am used to watching. When you switch to 7 1/2' HD I guess you see things you haven't noticed before.
All is good!
Thanks,
Steve
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"It is far better to grasp the Universe as it really is than to persist in delusion, however satisfying and reassuring." Carl Sagan
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