14 Apr
2013
14 Apr
'13
4:53 p.m.
On 04/12/2013 02:24 PM, David Riley wrote:
The PSU is probably pretty similar to an ATX supply in
that the
motherboard pulls a pin high or low to soft-switch the supply on and
off. I'm having trouble finding a pinout for the 6400's PSU
Just an update on this - with the 5x00 bus pinouts that you gave me, I was
able to confirm that the 6400 is the same (at least as far as the PSU
signals) - so thanks for the link.
Unfortunately, it's also confirmed that I've got a dead PSU; I've got no
+5V on the standby/TRKL line at all. I've done a few basic checks for open
diodes, transistors etc. on the AC input side, and things seem OK there.
I think I have a spare ATX PSU from a PC somewhere, so I may try that if I
can contrive something to marry up the different power-on signal (or I
suppose I could just hit the power switch on the back of the Apple and then
turn the PSU on manually, just for testing purposes) - there's probably no
point my spending time fixing the Apple's PSU if the system board is toast
anyway...
cheers
Jules