Bought an AST keyboard to go with an all-in-one AST computer - weird issue

[mojorific]

Hello fellow vintage pc users!

I have had a nice all-in-one AST Advantage PC, and recently acquired a matching AST advantage keyboard to use with it.

Unfortunately, when I use this keyboard, my sound card stops functioning. As soon as I remove the keyboard and switch to a different one, the sound card works again.

Has anyone encountered a problem like this before? Is it possible the keyboard is shorting out and causing a power problem? I'm very hesitant to plug it back in, as I really don't want to cause damage to my motherboard. It's not really replaceable, as it is built specifically for this machine.

Thanks for your advice!

 

[retro-pc_user]

Check the internals of the keyboard for any bad capacitors, chips, resistors, diodes, the whole 9 yards for any broken traces, cold or cracked solder joints, and for electrolytic acid on the board (leaked capacitors).