Strange trackpad noise observation

Discussion in 'MacBook' started by Skeletal-dæmon, Jun 6, 2009.

  1. Skeletal-dæmon macrumors 6502

    Joined:
    Apr 27, 2008
    #1
    This isn't so much a problem as something I have just noticed. Everyone in the house is asleep, and for once I don't have headphones on.

    When I use two-finger scrolling on my BlackBook, there is a strange... almost purring noise from my machine. It's extremely quiet, and I can only pinpoint it to the kinda under-keyboard-towards-hinge area. It is loudest when I scroll on pages with a lot of dark/light alternation on the page, and quietest on plain light pages.

    It really is quite odd. Am I making my Mac purr by scrolling through all my regular webcomics? :confused:
     
  2. RiCEADDiCTBOY macrumors 6502a

    RiCEADDiCTBOY

    Joined:
    Dec 26, 2007
    #2
    i'm going to take a wild guess and say...fan?
     
  3. Skeletal-dæmon thread starter macrumors 6502

    Joined:
    Apr 27, 2008
    #3
    Nope, SMC doesn't show any speed variation, and I don't think its a vibration at all, just this odd little 'prrrrrrrr' noise.
     
  4. retroneo macrumors 6502a

    Joined:
    Apr 22, 2005
    #4
    It's the power supply making different sounds when there is different levels of load.

    Scrolling uses a little more power and you'll sometimes hear the components vibrate and make different sounds.

    There's an awesome article by and ex-intel worker who detailed it in depth. I'll see if I can find it.
     
  5. RiCEADDiCTBOY macrumors 6502a

    RiCEADDiCTBOY

    Joined:
    Dec 26, 2007
    #5
    that was my next guess. ;)
     
  6. NewMacbookPlz macrumors 68040

    NewMacbookPlz

    Joined:
    Sep 28, 2008
    #6
    That's crazy! :eek:

    Nothing like that on my UMB thankfully, heh...
     

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