All solenoids on J113 (brown) are down for my NGG. Have 70V at the coils. I put it in solenoid test and none of the outputs on U6 are changing, whereas they are for the other solenoid lines (U7 flips output states on during solenoid just fine). I have power to U6 and chip enable and output enable are OK. So is this a bad 74LS374 or am I missing something upstream. As I said all other solenoids seem ok.

Thanks. Yes after posting this last nite realized that if that chip was truly dead then probably the coils should be locked on, NOT all off. As you point out it’s very likely the clock on pin11 isn’t connected and thus it’s not latching the input. So it probably is a connector issue and that chip is all good. I have a Congo so I shall be doing some board swaps to prove this out.

Ok I hate posts that have no resolution so let me provide one. Usually when the octal latches on the driver board fail this locks on coils. As Pin_Guy suspected, the CLK (SOL4 from the ASIC) was never making it to U6. The reason it wasn’t making it was that the ASIC was not making contact with its PLCC chip holder. Reseat the ASIC and it’s all good, solenoids working again. So to summarize if your entire bank of coils don’t work, possibility 1) no 70V line 2) no CLK line to the LS374 driver for that bank of solenoids. This could be due to a bad LS374 chip (less likely), loss of 5V to the LS374, or bad connection of select line (SOL lines from ASIC) going to driver board.