Low/No fan speed

Discussion in 'MacBook' started by Fried Chicken, Feb 14, 2013.

  1. Fried Chicken macrumors 6502

    Fried Chicken

    Joined:
    Jun 11, 2011
    #1
    My Macbook has a fan speed that hovers between 0 and like 400 RPM.
    The macbook was recently torn apart and all the dust removed (this problem was exhibited before taking it apart).

    Trying to increase the fan speed using smcfancontrol causes the fan to go to 0 permanently.
    I tried resetting the SMC several times which worked in the past but didn't work now.

    I still believe it might be a software issue, but I'm not sure any other maneuvers to take. Otherwise I'll replace the fan but I'd rather not take the computer apart again.
     
  2. Fried Chicken thread starter macrumors 6502

    Fried Chicken

    Joined:
    Jun 11, 2011
    #2
    I've also noticed a kernel_task using a high percentage of the CPU, which I've attributed to being caused by the low fan speed, causing the CPU temp to skyrocket causing the kernel_task to use even more CPU.

    Basically the computer is committing suicide.
     
  3. Brian Y macrumors 68040

    Joined:
    Oct 21, 2012
    #3
    Easy way of telling if it's a software problem - boot from another OS or your installation CD and monitor the fan.
     
  4. Fried Chicken thread starter macrumors 6502

    Fried Chicken

    Joined:
    Jun 11, 2011
    #4
    Wouldn't the SMC be independent of the OS being run on the computer?
     
  5. brop52 macrumors 68000

    brop52

    Joined:
    Feb 26, 2007
    Location:
    Michigan
    #5
    You thought it may be a software issue. The different OS would rule that out and prove to you it is hardware.
     

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