Mac Pro mid 2012 Screeching PSU fan?

Discussion in 'Mac Pro' started by Zaithe, Feb 27, 2017.

  1. Zaithe macrumors member

    Zaithe

    Joined:
    Jun 27, 2016
    #1
    I hear a sound toward the back of my tower near the PSU which sounds horrible. It's very loud and am sure its a fan. I think its the PSU fan. Is the PSU fan inside of the PSU or outside of it? Do i have to buy a new PSU or can i just buy a fan like this to replace it? http://www.ebay.com/itm/076-1232-Ap...oling-Fan-076-1232-4-Pin-Genuine/401257968567

    It says its for a A1186 when mine is a A1289 but i can't find a A1289 PSU fan. What should i do? Thanks in advance!
     
  2. h9826790 macrumors 604

    h9826790

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    Hong Kong
    #2
    The fan is independent to the PSU. However, it seems the PSU fan is a part of the case. That's why you can't find the parts.
     
  3. Zaithe thread starter macrumors member

    Zaithe

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    Jun 27, 2016
    #3
    Good to know, do you think the A1186 fan would work as a replacement? After all the case design is almost identical..
     
  4. h9826790 macrumors 604

    h9826790

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    #4
    I don't think so. The outside looks similar, the inside is entirely different.
     
  5. owbp macrumors 6502a

    owbp

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    Belgrade, Serbia
  6. ActionableMango macrumors 604

    ActionableMango

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    Sep 21, 2010
    #6
    You can verify which part it is for sure with MacsFanControl. Raise/lower the fan speed of the PS fan and the screech should change pitch if its that fan. If its not that fan, try the other fans to identify which fan. If its none of the fans, maybe its a screech from the power supply from bad caps.

    Some people here have had success fixing bad fan noise by thoroughly cleaning out their fan.

    If the bearings are going bad or running dry and there is access to the oiling point, you might try lubricating the fan's bearings: http://www.overclockers.com/em-spinning-lubricate-pc-fans/
    (I don't know if the MP's fans can be oiled this way.)
     
  7. h9826790 macrumors 604

    h9826790

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    #7
  8. owbp, Feb 27, 2017
    Last edited: Feb 27, 2017

    owbp macrumors 6502a

    owbp

    Joined:
    Jan 28, 2016
    Location:
    Belgrade, Serbia
    #8
    You seem to be right. It is just gone from the parts list compared to earlier macs, never noticed that 'till now
    macpro_2006-1.jpg macpro_mid2010_mid2012-1.jpg

    P.S. my cMP1,1 is on the loan to a friend right now, but as soon as i get it back ill open them up and compare fans, just for the sake of it.
     
  9. Zaithe thread starter macrumors member

    Zaithe

    Joined:
    Jun 27, 2016
    #9
    Thank you guys for your help, i'll try to physically track down the fan to see if i can get a better idea of whats going on. Adjusting the PS fan in mac fan control increased the RPM's of a fan near the front of the computer. The broken fan doesn't seem to show up in the list as those all work fine. The broken fan however will barely turn.
     
  10. h9826790 macrumors 604

    h9826790

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    #10
    Do you mind to post a screen capture of MacsFanControl? Just want to know your PSU temperature if you suspect the fan is failed. Thanks!
     

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