--- On Sun, 6/2/13, Macs R We wrote: > Just because the capacitors on the logic board "look fine" > doesn't mean they are fine. Bulges prove they are bad, but > no bulges don't prove anything. One thing that is known is > that if your capacitors have "+" shaped slots on top, they are > not the bad lot -- the bad lot all have "K" shaped slots on > top. This can also be determined by the serial number > ranges for the bad iMacs, which Apple has published.
Interesting! The caps on this particular board are plus-shaped, so by that logic they should not be an issue. On the other hand, according to http://jimwarholic.com/2008/07/how-to-repair-apple-imac-g5.php the serial number of the machine in question _does_ fall within the affected range. So I'm stumped. > On this model, if the machine boots as far as yours does, > I'd sooner suspect the logic board capacitors than the power > supply capacitors. In any event, the 12V lines are > mainly used for running mechanicals (hard drive, optical > drive) and not logic elements. --- On Sun, 6/2/13, LuKreme wrote: > I wouldn't think that 0.2V out of 12V would be a problem at > all, especially since the 12V lines have nothing to do with > powering the motherboard (the motherboard and other circuit > boards get the 5V or 3.3V). I suspect it is not the PSU. That's really useful information -- thank you both. I suppose I might have guessed that the electronics all run off the two lower voltages, but I was not sure. One other thing that was suggested to me is to re-apply the thermal paste between the CPU and the heat sink. I'm away from the affected machine for a long while now, but will look into that when I get back. Meantime, does anyone have a favorite temperature monitor utility that would run on such an old machine (PPC G5, 10.4)? I'm thinking that would be a useful thing to try before I pry off the heat sink. Thanks again, -HJ _______________________________________________ MacOSX-talk mailing list MacOSX-talk@omnigroup.com http://www.omnigroup.com/mailman/listinfo/macosx-talk
