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Corleone88
Joined: 09 Dec 2006
Posts: 474
Location: France
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| Posted: Tue Apr 09, 2013 9:32 am Post subject: Brightness adjustment (G1) on BG808 |
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Hello,
I read that on the R7621745 board (Barco 808 decoder board), it is possible to adjust brightness through G1 adjustment.
Is there someone knowing how to do that? Is G1 a pot to adjust?
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Ile
Joined: 09 Mar 2006
Posts: 1491
Location: Jyväskylä, Finland
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| Posted: Wed Apr 10, 2013 7:46 am Post subject: |
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Only way to adjust brightness from driver board (decoder part is only used to decode composite and s-video signals) is using brightness control from remote. G1 is created in this board, but there is no adjustment for it.
There is pot adjustments for preamp and output amp gains for each colors, these are scope calibrated at factory to 75 ohm dummy loads. No need for this adjustment, if there is enough range in color temp custom adjustments. Probably not needed even transistors at those stages are chanced. I made this calibration long time ago when I was hunting cause for streaking problem.
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Corleone88
Joined: 09 Dec 2006
Posts: 474
Location: France
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| Posted: Wed Apr 10, 2013 7:52 am Post subject: |
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Ok. Thanks Ile
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Corleone88
Joined: 09 Dec 2006
Posts: 474
Location: France
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| Posted: Sat Apr 20, 2013 1:37 pm Post subject: |
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Hi,
I did some new tests in order to locate the problem, but I am getting more and more confused. I really need help.
- Configuration 1: OPPO (1080i60 RGB)-> Eisemann modified cards on BG 808 = NOK (brightness problem: too bright)
- Configuration 2: OPPO (1080i60 Yc422)-> Eisemann modified cards on BG 808 = OK (brightness is ok)
- Configuration 3: OPPO (1080i60 RGB)+HDFury-> original cards on BG 808 = NOK (brightness problem: too bright)
- Configuration 4: OPPO (1080i60 Yc422)+HDFury-> original cards on BG 808 = NOK (brightness problem: too bright)
None of the configuration use a Lumagen vp.
So I don't understand why configuration 2 is ok. I thought that after that the input digital signal is decoded, we get a RGB analog signal which should be the same with RGB or Yc422 input signal.
It looks like with a Yc422 input, Greg Eisemann's cards hide somehow the real problem. As I really need to have RGB working (I use a Lumagen HDQ which ouputs RGB signal only), I need to have this problem fixed.
Thanks for your help.
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