Helping a friend resolve this same issue on a STTNG and I keep coming across the auxiliary 8 driver board. Both those games use this same board. Hopefully this will point you somewhere to hunt as well.
(Topic ID: 243195)
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Quoted from SeymorGoldfarbJr:I resolved the issue. Swapped driver boards made the flashers work, so I knew the issue was on the driver board. Looking at the schematic, the problem had to be at U3 or R255. I the verified I wasn't getting a signal on pin 11 of U3. I ran a jumper between R255 and pin 11 of U3 and the problem was solved.
Good deal. Glad your problem has been resolved its no fun tracking this kinda stuff down.
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