Replacing PSU in 2009 Mac Pro?

Bafflefish

macrumors 6502
Original poster
Oct 16, 2009
407
0
To briefly summarize: I was watching video on my 2009 Mac Pro (4.1 flashed to 5.1, with a X5690 installed) and all of a sudden I heard a loud pop. Unfortunately I don't know if it came from what component but it sounded as if a capacitor had blown.

I didn't notice any issues with my speakers, the Mac Pro, or the monitor I was using, but I shut both the speakers and Mac Pro down out of precaution.

I popped open the side of the Mac Pro and didn't see any blown capacitors on the motherboard or on the components I could see, but since I can't really see inside the PSU, I can't rule that out. I also haven't tried opening up my speaker system subwoofer yet to see if that's where it occurred.

My question currently is, what's the possibility it was a capacitor in the PSU that went, and do I try to keep using it and see if it fails? My fear is that if it goes out it'll take various components with it.

The other question I have is that I'm prepared to buy a replacement PSU off of DV Warehouse once I can figure out which of the two models they show is the correct one (https://www.dvwarehouse.com/661-5011-Apple-Power-Supply-980W-for-Mac-Pro-Early-2009-614-0435-----NEW-p-36243.html or https://www.dvwarehouse.com/661-5449-Apple-Power-Supply-980W-for-Mac-Pro-2009---2012---NEW-p-37683.html), but I've read before that with a PSU replacement I'd need to use the system disks to reset the fan profiles. I don't have those disks since I bought the Mac Pro second hand as a bit of a fun hobby to modernize it, and so I wouldn't be able to reset the fan profiles if I had to. Are the disks needed?

Thanks!
 

Filin

macrumors regular
Mar 7, 2010
135
37
Ukraine
I've read before that with a PSU replacement I'd need to use the system disks to reset the fan profiles. I don't have those disks since I bought the Mac Pro second hand as a bit of a fun hobby to modernize it, and so I wouldn't be able to reset the fan profiles if I had to. Are the disks needed?
I think "SMC Reset" procedure is enough
 

rogerdee123

macrumors newbie
May 28, 2008
28
5
If it turns out to be your PSU, when you remove your bad PSU you can see the Apple part number etc on the old PSU and you can order a PSU with that part number.
 

ActionableMango

macrumors G3
Sep 21, 2010
9,263
6,249
FWIW, when I heard a loud pop from a CRT's power supply I opened it up and it was quite obvious. A bridge rectifier had blown in half. Snipped it off and soldered a new one in. Just cost a few bucks.