So I have a Macintosh II board 338J from 1988. I received it with damaged traces and it was dead. I have fixed some bad traces and now I get the startup chime but that is it. It stop somewhere in the process before loading the floppy drive. No video ever even with known good cards.
I have been using these schematics to go over the traces but I really need a new set of eyes on this as I am beyong frustrated.
I have verified the data lines from all 4 roms to the VC2869 sound chip, the IWM, c8 (74Als651), D8 (74Als651), e8 (74Als651), VIA1, VIA2, 53c80 SCSI chip, Z8530 SCC chip, f8 (74Als651), the 68020 socket, MC68881 FPU socket, and the MC68851 PMMu socket. I have verified the RAM and roms work in another working MAcintosh II.
I did not try swapping the Sound chip or IWM (although I cleaned the contacts on the IC (would a bad IWM or Sound ic halt the bootup?).
edit:: I also verified the DATA lines from the 4 rom chips to the 8 ram simm slots...
I feel I am pretty close to resurrecting this board, please help!