Battlezone Half Screen, please help if you can

     I still have a half screen on this BZ AVG board. Problem has to be in
the Z section, but I am stuck trying to track it down. Board is in test mode,
boots fine, no errors.
     ZBLANK is HLP (pin 11 B7 LS86). I also found that pin 12 of B7 is HLP.
This should both be High. Pin 13 is low, as it should be. Replaced B7, C7
(LS174), P9 (LS164) and N9 (LS02). Also replaced Q7 (3906), Q8 (3904), and Q9
(3904). Still have the same trouble.
     Also, is 1.8mv of AC current OK on my +15 line? I checked the AC ripple
on a working AVG, and it is down around .3mv. I didn't think this would cause
my problem, though.
     Any further help would be appreciated.

Thank You,
Michael Kelley

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Received on Wed Feb 26 13:35:27 2003