Ile
Joined: 09 Mar 2006
Posts: 1491
Location: Jyväskylä, Finland
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| Posted: Mon Jan 18, 2010 12:35 am Post subject: Why gamma box is causing flicker with BG808s? |
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With box in chain I got similar bright scene flickering that with too low refresh rate.
For example with 75 Hz there is no flickering without box, fed straight from my Ati video card. When I ad box to chain it start to flicker like with 48Hz refresh or something.
Anyone found similar problem with s-series Barcos? And what can cause it?
Some back ground.
Got Box 1021 and it had some scrolling horizontal bars and flickering.
-Tested with other ps and also with two 9VA batteries connected straight to +-5VA regulators, no chance.
-Thought it have clamping problems and removed clamping circuit and made it DC coupled, no more scrolling horizontal bars but flicker is still there. Syncs are no more involved in this version.
-Didn't found any flickering with scope and box work ok with 5$ crt monitor.
-Thought that problem is too hot signal for 808s input board, made chances to board to get 700mV output, but no effect.
-Turning ABL off from 808s didn't help either
Same story with box based to Scott's gamma design, so it's not BOX 1021 problem.
I'm start to run out of ideas...
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