Defect Poll, Unibody MBP: Fans Make 'Grinding' Noise at Min RPM w/ Base @ 45º Angle

Discussion in 'MacBook Pro' started by dcMobile, Dec 22, 2008.

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Do your Late 2008 MBP fans 'grind' at min speed w/ base @ 45º angle?

  1. Yup--I can hear it clearly in that 40º-50º sweet spot.

    5 vote(s)
    38.5%
  2. Nope--the fans are practically silent at minimum speed no matter how I tilt it fore and aft.

    8 vote(s)
    61.5%
  1. dcMobile macrumors member

    Joined:
    Jul 16, 2007
    Location:
    NYC
    #1
    Hey Late 2008 MBP Owners...

    I tend to use my MBP in bed a lot, propped up on my thighs at about a 45º angle, and I've noticed a grinding noise from the fans when using it this way.

    I've just learned that this grinding noise is not a result of case compression, as even if I lift the machine up by the sides and rotate it fore and aft in space, there's a 10º zone (between 40º and 50º approximately) that the fans make a distinct grinding sound.

    Note that, for me anyway, this will only happen between minimum fan speed (1990 rpm) and ~2300.

    Let me know what you guys find. Be sure to put one ear a few inches away from the hinge area when you test!
     
  2. MICHAELSD macrumors 68040

    MICHAELSD

    Joined:
    Jul 13, 2008
    Location:
    NJ
    #2
    It's definitely there for me. I don't really consider it a problem, though, since I never use my MacBook Pro that way.
     
  3. J the Ninja macrumors 68000

    Joined:
    Jul 14, 2008
    #3
    Nope. Just tried rotating mine from flat on my desk to 90 degrees. Aside from almost getting hit in the face by the NEW Easy-To-Operate-Hinge and the NEW Screen-Covered-In-Really-Heavy-Glass conspiring to make the NEW Flops-Over-From-Its-Own-Weight-Like-A-Baby's-Head lid, everything was fine. No noise.
     
  4. xpovos macrumors 6502a

    xpovos

    Joined:
    Jun 7, 2007
    Location:
    Tennessee
    #4
    My fans were doing the same. The left fan was especially offensive. Sometimes tilting wasn't even necessary as it would grind/rattle even when flat on a table, but the noise got much louder as the laptop tilted.

    I had both cooling fans replaced under warranty and have had no such fan noise ever since.

    (Of course, I now have the low-brightness 9400M flicker that probably requires a logic board replacement.)
     
  5. darrenscerri macrumors regular

    darrenscerri

    Joined:
    Nov 15, 2007
    Location:
    Malta
  6. raviliousness macrumors newbie

    Joined:
    Dec 15, 2008
    Location:
    Reading, UK
    #6
    No no change in noise at 40-50 degrees.

    Although the left fan has had a continuous (fairly quiet but noticeable) high-rate ticking sound at 2000rpm ever since playing some games with the fan up high at around 5000rpm.
     

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