Crazy fan speeds

Discussion in 'MacBook Pro' started by Hisdem, Jan 3, 2012.

  1. Hisdem macrumors 6502a

    Hisdem

    Joined:
    Jul 3, 2010
    Location:
    Boca Raton, FL
    #1
    Hi all. I just did a fresh install of Lion in my machine, after using SL for about 3 days again. The objective behind this was to try and fix my crazy fans, which, since upgrading to Lion, will run at ridiculously high speeds, even if I am just using 3% of the CPU, and at a temperature below 50C.

    I have tried SMC and PRAM resets, cleaning the fans, and nothing. This seems to be a glitch in Lion. Has anyone else suffered from the same problem? If so, did you manage to fix it?

    Here's a screen from iStat Pro:

    Another note is that my fan speeds no longer increase on a scale, they just boom from 2000 to 6500RPM in a second, and stay there for a while, and then go back to normal. This happens even when I'm not running absolutely anything. Just watching my desktop.
     

    Attached Files:

  2. JronMasteR macrumors 6502

    JronMasteR

    Joined:
    May 4, 2011
    Location:
    Switzerland
    #2
    That's strange. A SMC reset usually fixes these kind of issues. Have you installed SMC fancontrol or something similar?
     
  3. Hisdem thread starter macrumors 6502a

    Hisdem

    Joined:
    Jul 3, 2010
    Location:
    Boca Raton, FL
    #3
    Not using any SMC control software... At least not that I know of. :(

    I don't really care too much about the fan noise, but the main issue is that my laptop is nearly useless as a laptop because the battery won't last an hour with the fans running at max speed the whole time...
     
  4. thundersteele macrumors 68030

    Joined:
    Oct 19, 2011
    Location:
    Switzerland
    #4
    So they work properly when using SL?

    Did you completely wipe your system before installing Lion?
     
  5. Hisdem thread starter macrumors 6502a

    Hisdem

    Joined:
    Jul 3, 2010
    Location:
    Boca Raton, FL
    #5
    Positive. Deleted everything but my iTunes library. Actually, I deleted it too, and then imported only it back from my TM backup. The rest was all freshly installed. I will take the computer tomorrow to Apple, but I'm still wondering if I should try another 100% fresh install.
     
  6. GuitarG20 macrumors 65816

    GuitarG20

    Joined:
    Jun 3, 2011
    #6
    i would just go ahead and take it to apple.
     
  7. Hisdem thread starter macrumors 6502a

    Hisdem

    Joined:
    Jul 3, 2010
    Location:
    Boca Raton, FL
    #7
    Left the computer at Apple service today. Problem seems to be a busted sensor. Which will mean that I will end up needing a new logic board. Depending on cost, I might replace it. Still, I was (and still am) very pleased with my MBP.
     
  8. thundersteele macrumors 68030

    Joined:
    Oct 19, 2011
    Location:
    Switzerland
    #8
    Ah, that's annoying. Big cost to fix a small problem probably.
     

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