I've tested the Vcc pins on all the chips that are
on the board and none
show +5. The A500 works without issue so I know the power supply is ok.
I can find +5 on the .100 dual pin header that the memory expander plugs
in to, but no where else. +12V does show up on the molex power connector
for the drive.
I've also checked both sides of what look like tantalum caps and I get no
power there either. I can't see any visible damage to the board, no cut
or scratched traces, etc. I'm at a total loss as to why it's not getting
any power.
Is there anythign on the PCB that could be a picofuse (may look like a
resistor, just to confuse you!). That's the only thing I'd expect ot
possibly be in series with a 5V supply to an expansiopn board.
It's not something silly like a dry joint on the connector, or a broekn
contact, is it?
-tony