Links below to tables of the pin-out voltages on the G5 power supply.
Should be able to check these with a good high impedance volt meter.
P1 Connector...
http://d3nevzfk7ii3be.cloudfront.net/igi/meMD2v3echZtptCG.large
P2 and P3 Connectors...
http://d3nevzfk7ii3be.cloudfront.net/igi/KIX3V2Cxcc2Ee5On.large
Info from this page...
http://tinyurl.com/n6jhbq6
-p
On 1/30/2014 1:19 PM, John wrote:
Do you have any way to actually check for voltages coming out of the
power supply?
On 1/29/2014 11:19 PM, David Mann wrote:
Thanks Zos, you're pretty much saying what I thought.
I took the power supply out earlier today and had a look to see if
any caps (or anything at all) had suffered obvious failures but it
looked pretty good. Minimal dust, too but I vacuumed it out, gave
things a wiggle and put it all back together with no change in
behaviour.
I'm only annoyed because of the scanner. I'll have to check whether
I've scanned all of my 35mm slides. I scanned the last of my medium
format stuff last year.
Cheers, Dave
On Jan 30, 2014, at 2:12 pm, Zos Xavius <zosxav...@gmail.com> wrote:
It should start up with a bad battery. Your power supply is most
like dead or the caps on the board have failed.
On Wed, Jan 29, 2014 at 8:08 PM, David Mann <dmann...@gmail.com>
wrote:
Hi all,
I started up my old G5 to do some slide scanning today but it
seems to be on the blink. At first I had some strange problems
communicating with the scanner but it came right and I got a
couple of scans done.
I left the machine to idle while I had lunch but when I came back
it had frozen up and I had to hold the power button down to get
it to shut down.
Now it won't start up :( The fans and hard drives spin up but
that's it. No chime, no signal to the display. The power LED
only lights when I press the power button. I think it was
lighting up at first, but it stopped after I did the PMU reset
(see below).
I've tried re-seating the video card and the memory, tried
starting it with the hard drives unplugged, and also with a
different monitor connected to the other port on the video card.
I'm not able to get it to respond.
I've tried resetting the PMU / SMU using these instructions, with
no luck. http://support.apple.com/kb/HT1939
http://support.apple.com/kb/HT1436
I also followed the procedure to reset the PRAM but I didn't hold
much hope. http://support.apple.com/kb/HT1379
I'm now at the conclusion that the power supply is probably
faulty. Do any of our resident Mac experts have any further
suggestions? It's a first-gen single-processor 1.6GHz G5. I
just checked and it's just a couple of weeks over 10 years old!
I've wondered if it would be worth replacing the battery on the
motherboard but I'm not really sure.
I've only kept that machine around because it has no resale value
and Minolta didn't release drivers for later OS versions because
they exited the scanner business. I couldn't stand Vuescan when
I last tried it so I don't really want to go down that route. I
guess the good thing about it having no resale value is that I
can replace it cheaply through the secondhand market.
Unfortunately I was just getting started on a project to scan
some really old glass-plate slides for someone :( Might have to
resort to a macro lens and a light box.
Cheers, Dave
--
Being old doesn't seem so old now that I'm old.
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