Mac Mini fans at full speed without case

Discussion in 'Mac mini' started by jpcoelho, Aug 30, 2014.

  1. jpcoelho macrumors member

    jpcoelho

    Joined:
    Jan 11, 2013
    Location:
    Aveiro, Portugal
    #1
    Hello!

    I am trying to adapt a late 2009 Mac Mini to a Mac G4 Cube case, but when I boot the mini without its case, the fan automatically speeds up to full blast... does anyone know what contacts in the case are responsible for this?

    Thanks in advance...

    best regards,
    Pedro
     
  2. rrl macrumors 6502

    rrl

    Joined:
    Jul 27, 2009
  3. jpcoelho, Aug 30, 2014
    Last edited: Aug 30, 2014

    jpcoelho thread starter macrumors member

    jpcoelho

    Joined:
    Jan 11, 2013
    Location:
    Aveiro, Portugal
    #3
    thank you for the input, but I'm not sure I understand... pictures of what exactly? the mac mini without the case? the mac mini case?
     
  4. DeltaMac macrumors G3

    DeltaMac

    Joined:
    Jul 30, 2003
    Location:
    Delaware
    #4
    What modifications have you made to the mini - beyond just removing the top cover?
    If the hard drive temp sensor is not connected, then the fan will default to run at maximum speed. That one sensor would not normally be disturbed just by removing the top cover. Have you modified the mini to bypass the interconnect board (where both the hard drive and optical drive connect?) That board is where the IR sensor, the fan, and the speaker connect. There's also another connector at near the outside edge of that board, for the hard drive temp sensor. That would be it...
     
  5. jpcoelho thread starter macrumors member

    jpcoelho

    Joined:
    Jan 11, 2013
    Location:
    Aveiro, Portugal
    #5
    Hi,

    The only modification that was done was removing the optical drive, but the interconnect board and hard drive are still in place...
    I believe it could be some contact that the case makes when in place, because as soon as I fit the top case (with the mini running), the fan spins down to normal speed...
     
  6. DeltaMac macrumors G3

    DeltaMac

    Joined:
    Jul 30, 2003
    Location:
    Delaware
    #6
    There's nothing in the top housing that contacts anything electrical.
    The connector for the sensor is fairly close to the case, so you should check that. It's labeled J204 on that interconnect board, if you need to verify that you are looking at the right connector. It might be moving just a little when the case comes off, then is loose enough to lose connection, causing the fan the spin up. Reseat that connector, even if it looks OK.
     
  7. jpcoelho thread starter macrumors member

    jpcoelho

    Joined:
    Jan 11, 2013
    Location:
    Aveiro, Portugal
    #7
    Thank you for your assistance, I will try that and see if it resolves the issue!
     
  8. jpcoelho thread starter macrumors member

    jpcoelho

    Joined:
    Jan 11, 2013
    Location:
    Aveiro, Portugal
    #8
    You were completely right, the J204 connector on the interconnect board was not completely inserted and was causing the issue... thank you very much for your help!

    Cheers,
    Pedro
     

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