Very new to owning an Apple computer.
I recently got my hands on a couple of Apple IIe computers.
One is working fine the other seemed to be dead.
Both have boards Logic Board ID: PCB: 820-0188-A (International) - REV: 607-0288-C in them.
I managed to get the non-working one up again. It had a short to ground on the 12v line which was caused by a bad 10uf cap. Replaced that and we have power LED.
Now to the strange issue. The recently repaired unit started up fine and gave me the APPLE IIE message at the top of the screen and can load disks. On switching off the computer and back on again I get garbage on the screen and a flashing cursor which allows me to use the keyboard .
Mulitple restarts of the computer gives the same result. I can however get the machine working again by removing the keyboard cable, switching on the machine without it connected (getting a screen full of garbage), switching off the machine and inserting the keyboard cable again and starting up again. Computer works and can load disks at this point.
This behavour can be replicated over and over. I have swapped over every socketed chip from the working machine to the non-working machine and get the same strange issue.
I suspect it may be one of the 7400 chips getting stuck and for some strange reason corrects itself after performing the start without a keyboard attached.
Any ideas on this one? Would be great to get this machine running stable.