Phipli
Well-known member
Morning folks.
I bought a spare 8100 style PSU because I'm short of them - I have three dead ones.
The new one is a late 225W version from an 8100/100 and was sold as working. It has a fault I haven't seen before - the fan doesn't run, but it outputs power. I've confirmed that the fan spins when I power it from 5V externally, so the issue seems to be in the part of the PSU that supplies the fan.
The fan board looks... Well done - see attached photos. There also looks to be some cap juice. It would be nice if that was all the issue was, but I suspect that was a cause of another failure.
I guess my questions are...
1. I'm not being dumb am I? The 225W PSUs aren't temperature dependent fan controlled are they? I can't imagine they would be given Apple went to the effort of using a peltier cooler.
2. Has anyone seen this issue before?
3. Has anyone fixed this issue before?
Good news is the logic board seems to work. Bad news is I now have 4 bad PSUs of this type. Sigh. I hate PSU repairs. They're too spicy.
I bought a spare 8100 style PSU because I'm short of them - I have three dead ones.
The new one is a late 225W version from an 8100/100 and was sold as working. It has a fault I haven't seen before - the fan doesn't run, but it outputs power. I've confirmed that the fan spins when I power it from 5V externally, so the issue seems to be in the part of the PSU that supplies the fan.
The fan board looks... Well done - see attached photos. There also looks to be some cap juice. It would be nice if that was all the issue was, but I suspect that was a cause of another failure.
I guess my questions are...
1. I'm not being dumb am I? The 225W PSUs aren't temperature dependent fan controlled are they? I can't imagine they would be given Apple went to the effort of using a peltier cooler.
2. Has anyone seen this issue before?
3. Has anyone fixed this issue before?
Good news is the logic board seems to work. Bad news is I now have 4 bad PSUs of this type. Sigh. I hate PSU repairs. They're too spicy.