---------- Original message ---------- Subject: Re: Power Mac G5: how to repair a broken PSU? Date: Freitag 21 Mai 2010N From: Kris Tilford <ktilfo...@cox.net> To: g3-5-list@googlegroups.com
> In english the term is "capacitor" for "kondensator" and normally > they're "popped" and clearly visible: Shame on me. Sorry for that mistake. > <http://www.mad-monkey.co.uk/resources/pchf/capacitor.jpg> > > In the photo the "popped" ones have the red arrows and the tops are > "popped" upward, the 3 on left are still good with flat tops. None of the capacitors look as if they were popped. So it must be something else then – or I just overlooked it. > Bummer. I'd strongly believe the loud BANG means your power supply is > DEAD (for good). If it doesn't do anything anymore, there must be some – hopefully small – part that is broken. If this is the only damage, then the dead PSU could be easily repaired (by a pro). I would just have to identify what is broken and what is working. That's the hard part. > Mine didn't make such a loud noise when it died for > good, but I could smell it, and I could measure that the voltages from > all the 5v & 3.3v lines were gone. You can probably measure them using > this pinout: > > <http://img212.imageshack.us/img212/8477/g5psupinoutp1cn8.png> Mine is a „Late 2005“ model, so the PSU looks different. There are 710 W for the 2.0 GHz and 2.3 GHz Dual Core model and the 1000 W for the „Quad“ Dual 2.5 GHz Dual Core model. Surprisingly mine, even though a Dual Core 2.0 GHz model, had a 1000 W PSU installed. > Most likely you're about 6 months too late for a free replacement from > Apple: > > <http://www.apple.com/support/powermac/powersupply/repairextension/> > <http://web.archive.org/web/20080722225628/http://www.apple.com/support/pow > ermac/powersupply/repairextension/ Yeah, already tried that. The guy I was talking to on the phone, a german guy, needed to ask his superior because I was too late for the free replacement. It wasn't a big surprise that he then told me: „No.“ – I simply was 2½ months too late. > You may be able to use a much cheaper standard ATX power supply as a > replacement: > > <http://damntechnology.blogspot.com/2009/02/rebuilding-powermac-g5-power-su > pply.html Does this also work for the „Late 2005“ model type PSUs? > When Apple replaced my power supply under the extended warranty > program they also replaced the logicboard and both CPUs. They told me > this wasn't always necessary and the old ones were sent away to be > checked out and re-certified if possible for use in future repairs, > but they do each repair locally and it's cheaper to swap out the > logicboard & CPUs with "known good" ones rather than test the old ones > for possible damage "on the spot". I'm saying this because it's > possible the blown power supply ruined your logicboard or a CPU, and > your repair will be wasted time and effort. So I would need to borrow a good PSU just to see if the logicboard and the CPU are still good. This is a bad situation for me… > I'd recommend looking for a cheap used Apple power supply (hard to > find for cheap), or try the ATX conversion with a suitable wattage > higher quality ATX unit, perhaps used also (game players are always > selling old power supplies as they buy video cards that eat more & > more power). It's a risk, but I'd probably try it myself. Good luck! My guess is that such a project would be too big for me. I know where my limits are and /reconstructing/ a PSU out of other parts definitely is out of my reach. But thanks. Cheers, Andreas aka Mac User #330250 -- You received this message because you are a member of G-Group, a group for those using G3, G4, and G5 desktop Macs - with a particular focus on Power Macs. The list FAQ is at http://lowendmac.com/lists/g-list.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml To post to this group, send email to g3-5-list@googlegroups.com For more options, visit this group at http://groups.google.com/group/g3-5-list
