Replacing PSU in 2009 Mac Pro?

Discussion in 'Mac Pro' started by Bafflefish, Apr 17, 2017.

  1. Bafflefish macrumors 6502

    Oct 16, 2009
    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 ( or, 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?

  2. Filin macrumors regular


    Mar 7, 2010
    I think "SMC Reset" procedure is enough
  3. rogerdee123 macrumors newbie

    May 28, 2008
    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.
  4. ActionableMango macrumors G3


    Sep 21, 2010
    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.

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