CGA to VGA Brightness Issues

gustavas007

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Donor 2011
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I have a championship Sprint that has a VGA monitor in it. the game is a mid rez and is wired with it's composite sync (it wouldn't work with separate syncs) to a cga vga converter.

the screen is a little off to the left, fixable.

the real problem is that it looks great for a few min. and then it looks like someone slowly has turned the brightness up all the way. in the menu it's still set at 50%

it will go back to normal if the converter in power cycled, but quickly (2 min) fades to bright again.

I have tried another converter pcb with the same results.

monitor tests fine.

any ideas?
 
yeah they were both up pretty high, I am trying to turn them down together to keep a good picture... but i don't know what they do, and sometime the screen goes black. I'm gonna play with it for a pit and jump back on here.
 
Don't mean to hijack the thread, but what were the final settings? I've been using a similar board to test a Manx tt game ant the picture looks like crap, but gets better and worse when I play with the settings. Anyone know what they do exactly?
 
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