Replace Mac Pro 4.1 thermal sensor cpu A

Discussion in 'Mac Pro' started by derb ryan, Jul 5, 2016.

  1. derb ryan macrumors newbie

    Joined:
    Apr 1, 2014
    Location:
    Germany
    #1
    Hey guys,
    since upgrading to 12 cores on a 2009 Mac Pro, the fans are running on full speed right from the start.
    My guess is that the heatsink connection/thermal sensor on the board might be broken since I connected the connector the wrong way round first and couldn't start the machine. When fixing this, it started normally but with the fans running at full speed.
    Is it possible to fry the connector that way?
    Any ideas how to fix this?


    Some more information
    When starting from cpu B, the fans work as they should
    The northbridge shows 128°C
    Replaced the heatsink on cpu A - same result
    SMC/PRAM resetted
     
  2. h9826790 macrumors 604

    h9826790

    Joined:
    Apr 3, 2014
    Location:
    Hong Kong
  3. mattspace macrumors 6502

    mattspace

    Joined:
    Jun 5, 2013
    Location:
    Australia
    #3
    If that's the IOH sensor or whatever it's called, I have a feeling that's supposed to be closer to 70°C
     
  4. ActionableMango macrumors 604

    ActionableMango

    Joined:
    Sep 21, 2010
    #4
    Wow, 128°C is really high. I agree with h9826790.
     

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