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benareeno
Joined: 22 Mar 2006
Posts: 1614
Location: ottawa, canada
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| Posted: Tue Jun 22, 2010 3:16 am Post subject: G70, blanking and brightness fluctuation... |
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when I lower the upper blanking it's almost as if I cranked the brightness 20 clicks...the pic becomes somewhat washed out. I can correct by lowering brightness, but I'm wondering if something else is wrong.
Anyone see this before?
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CasetheCorvetteman
Joined: 09 Nov 2008
Posts: 6326
Location: Australia
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| Posted: Tue Jun 22, 2010 10:50 am Post subject: |
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You havent unpluged any fans by any chance have you?
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barcoed
Joined: 26 Feb 2008
Posts: 65
Location: Cambridgeshire, UK
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| Posted: Tue Jun 22, 2010 2:10 pm Post subject: Re: G70, blanking and brightness fluctuation... |
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| benareeno wrote: | when I lower the upper blanking it's almost as if I cranked the brightness 20 clicks...the pic becomes somewhat washed out. I can correct by lowering brightness, but I'm wondering if something else is wrong.
Anyone see this before? |
Yup - I've had this same problem on all my G70s. The problem goes away if I switch off the ABG. It appears when crossing the ABG line border. - But then everything is way too dark.
It was such a problem that it prevented me from using top blanking until I found an old firmware set of controller boards which meant I could switch off ABG and adjust G2 myself.
However, I'm still ignorant as to why it happens. 
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AFryia
Joined: 09 Mar 2006
Posts: 965
Location: S.E. Michigan VPH-G70Q
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| Posted: Tue Jun 22, 2010 11:07 pm Post subject: Re: G70, blanking and brightness fluctuation... |
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| barcoed wrote: | | benareeno wrote: | when I lower the upper blanking it's almost as if I cranked the brightness 20 clicks...the pic becomes somewhat washed out. I can correct by lowering brightness, but I'm wondering if something else is wrong.
Anyone see this before? |
Yup - I've had this same problem on all my G70s. The problem goes away if I switch off the ABG. It appears when crossing the ABG line border. - But then everything is way too dark.
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Interesting. 
I don't use top/bottom blanking so I never noticed. I only use left/right to hold the image off the edge of the tubes at higher scan frequencies.
I always run with ABG enabled. IMO the image is more stable.
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