I have now 'repaired' two boards (one each of a 475 and a 575) where some/much of the data/and/or/address lines under the on-board RAM have been destroyed. In both cases, I've been able to get enough bodge wires in place to be able to get the boards booting without the on-board RAM (just enough lines repaired to boot from a SIMM). I have had to either re-purpose pads for the on-board RAM as part of the bodge or there were simply too many tiny traces side-by-side for me to attempt a full repair that involved restoring the on-board RAM.
I'm curious:
I'm curious:
- How many other members have seen similar failures in boards they've repaired?
- What did you do about it?