I am finally starting to go through a pile of Galaxian boards and have a couple that are being weird. I have confirmed the two sets of character PROMs and Z80s are all good. I used my PROM burner to compare two sets of AUX PCB PROMs (to MAME sets) and even burned a new set. However, the two Galaxian boards don't show more than a screen full of "H"s or "8"s, depending on which AUX PCB I use (not any graphics of any kind or anything before this is displayed). It pulses quickly, so I assume the watchdog is resetting it. This is happening on both boards. I am testing on my JAMMA bench and recently replaced the two large caps on one Galaxian board, since they were leaking. I can't find my TEST PROM at the moment and don't have any more 2716 to burn another.
I have been hunting through the troubleshooting manuals and haven't seen anything that matches exactly what I am seeing.
My next plans are to piggyback the soldered-in 2114 RAM in row 3 to see if that changes the start-up screen any.
Thoughts?
Scott C.
I have been hunting through the troubleshooting manuals and haven't seen anything that matches exactly what I am seeing.
My next plans are to piggyback the soldered-in 2114 RAM in row 3 to see if that changes the start-up screen any.
Thoughts?
Scott C.

