Tempest - no blue

Repairing a bunch of old Tempest boards I have around.
I have a bench setup verified as working fine and I am
only swapping the larger pcb to get those working
first. I'm on the third one and it has an odd issue,
and I know its not the monitor as that works, or the
smaller pcb/interconnect.

The game works fine, but its missing the color blue...
All other colors are there at proper intensity (except
something that needs or is blue).. Any ideas what
could be the issue? Self-test is fine.. Could it be
something in the z-blanking circuit? If so does the
color blue point to any one chip?

Thanks.

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Received on Mon Apr 28 18:28:26 2008