OK, normally I just puzzle these out but this one has me stumped. So looking for some hints from some of you other board techs.
This 2518-17 mpu runs Leon's tests just fine. It has been modified to run 2732's at U2 and U6. I have tried a couple different sets of roms and confirmed the roms are good in another mpu. I have swapped and confirmed all the other chips in the other mpu board. I am getting the first flicker and 7 full flashes on the LED. THEN, instead of a half lit LED and a booted up game I get a quick half-lit flash and the LED goes dark. The 6800 is still chugging but nothing useful is happening. The voltages are fine including the +43V and the zero crossing signal is present at U10 pin 18. R134 has been replaced and has +5 on it.
Anybody seen this issue?