spiceyokooko
Well-known member
I rather suspect the answer to this will be what I expect, but I think it's worth asking the question just in case there's something I've either missed or over-looked.
I'm having problems getting a Macintosh IIci to boot and get past post. I've gone over all the likely causes several times, but I'll start with a few knowns -
- The PSU is known to be a working one - I've tested it in a IIcx and it boots it fine without problem.
- The RAM SIMMS (4 x 4 Mb in bank A only) are known to be good and work as I've tested them in the IIcx, I've also checked and rechecked they're seated correctly. I've also tried other known working 4 x 1Mb SIMMS too.
- The HD is known to be good as I've booted from it in the IIcx, it's correctly terminated and set to ID 0, there are no other devices on the SCSI chain.
- The PRAM battery is brand new and known to be good as it works fine in the IIcx and Mac IIx, I've also checked its output on a multimeter.
- The display is known to be good and works fine in the IIcx
- The nubus Video board is known to be good and working as it works fine in the IIcx.
I've completely dismantled the whole box and water/soap washed and then iso alchohol washed the board and allowed it to dry then reassembled the whole machine double checking all the connections.
So here's what happens when I try to boot the machine - the PSU fires up no problem and the HD spins up and starts working and I get the chimes of death - the display stays black.
I've swopped in a 512k ROM from a Mac IIx and switched the display connection from the nubus video board to the onboard video and the PSU fires up, the HD spins up and the display comes on but is plain mid/light grey with nothing else on it - but no chimes of death.
I'm now out of ideas as to what else it can be apart from a problem on the logic board. I've looked closely at the capacitors and there's no signs of bulging and saw no evidence of electrolyte on the board prior to washing it. It's possible of course the capacitors have failed and need replacing, but I wanted to explore all possibilities before doing that.
Does anyone else have any ideas?
Cheers!
I'm having problems getting a Macintosh IIci to boot and get past post. I've gone over all the likely causes several times, but I'll start with a few knowns -
- The PSU is known to be a working one - I've tested it in a IIcx and it boots it fine without problem.
- The RAM SIMMS (4 x 4 Mb in bank A only) are known to be good and work as I've tested them in the IIcx, I've also checked and rechecked they're seated correctly. I've also tried other known working 4 x 1Mb SIMMS too.
- The HD is known to be good as I've booted from it in the IIcx, it's correctly terminated and set to ID 0, there are no other devices on the SCSI chain.
- The PRAM battery is brand new and known to be good as it works fine in the IIcx and Mac IIx, I've also checked its output on a multimeter.
- The display is known to be good and works fine in the IIcx
- The nubus Video board is known to be good and working as it works fine in the IIcx.
I've completely dismantled the whole box and water/soap washed and then iso alchohol washed the board and allowed it to dry then reassembled the whole machine double checking all the connections.
So here's what happens when I try to boot the machine - the PSU fires up no problem and the HD spins up and starts working and I get the chimes of death - the display stays black.
I've swopped in a 512k ROM from a Mac IIx and switched the display connection from the nubus video board to the onboard video and the PSU fires up, the HD spins up and the display comes on but is plain mid/light grey with nothing else on it - but no chimes of death.
I'm now out of ideas as to what else it can be apart from a problem on the logic board. I've looked closely at the capacitors and there's no signs of bulging and saw no evidence of electrolyte on the board prior to washing it. It's possible of course the capacitors have failed and need replacing, but I wanted to explore all possibilities before doing that.
Does anyone else have any ideas?
Cheers!