SEGA G80 - Star Trek Draw Problem..

All,    After some troubleshooting into this issue (which affects the G80 - Control Card - only), I was wondering if anyone else may have run into this, since I am pretty much out of ideas.   Ok so here is the scenario..   Original problem: Complete lack of the color Green - missing lines - since resolved by replacing U2 on the Control Card.     Current problem:  While the color Green is now present in the middle and lower sections of the Monitor (imagine diving the screen into 1/3 rd's) and there is no problem with Line Draw, etc.     Main problem is that the color Green is missing (not at all present and all Green Lines are not being Drawn in the Upper 1/3 rd of the screen). This includes the Gauge on the Upper left hand side of the screen, which is also missing the Green Lines and Triangle indicator.    However, when I hook up the X/Y Outputs to an Oscilloscope All Lines are present (but only in black and white).    Also swapping Control Cards with a Good Set - displays All lines / Colors correctly - so not a monitor issue.    After replacing the Memory (which did not change anything), any ideas as to what could be causing this issue? Or better yet what on the Control Board, corrolates to ' Draw ' and the color ' Green ' / upper 1/3 or the screen ?    Appreciate your help,   Regards, _Arcadius
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Received on Mon Apr 2 13:11:04 2012