11" buzzing when on A/C

Discussion in 'MacBook Air' started by Munch, Oct 26, 2010.

  1. Munch macrumors member

    Joined:
    Jun 20, 2006
    #1
    There is a noticable hum/buzz/high pitched whine coming from the mag safe connector when the my 11" MBA is connected to power. It is much more noticeable when the system is off/sleep/lid is closed. Should I be concerned?
     
  2. Munch thread starter macrumors member

    Joined:
    Jun 20, 2006
    #2
    updat: I just unplugged the MBA, and I can hear a buzz coming from the white AC adapter itself as well.
     
  3. Mike225 macrumors 6502a

    Mike225

    Joined:
    Jul 15, 2010
    Location:
    SF BAY
    #3
    Could it be the CPU whining? Does it go away while doing stuff like scrolling, loading programs, and other CPU users.
     
  4. aberrero macrumors 6502a

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    Jan 12, 2010
  5. henry72 macrumors 65816

    henry72

    Joined:
    Jun 18, 2009
    Location:
    New Zealand
    #5
    Oh no~ WTH is Apple doing? Please don't!!!! please~ I will be very disappointed :(
     
  6. Moodikar macrumors regular

    Joined:
    Mar 4, 2010
    Location:
    Toronto, Canada
    #6
    Wirelessly posted (Mozilla/5.0 (iPhone; U; CPU iPhone OS 4_1 like Mac OS X; en-us) AppleWebKit/532.9 (KHTML, like Gecko) Version/4.0.5 Mobile/8B117 Safari/6531.22.7)

    Have you tried plugging in with the extended cable (USA plugs not European). The cable has a u-ground (third prong) that is grounded. The 2 prong version obviously doesn't.

    This may help if there is a power issue.
     
  7. Munch thread starter macrumors member

    Joined:
    Jun 20, 2006
    #7
    My ground is actually not working in the outlet I've got it plugged in. I will have to check tonight when I get home to confirm if that's the cause of the buzzing.

    There is no CPU buzz from scrolling. I used to have that with my original MacBook and it was annoying. This buzzing is definitely coming from the magsafe/power adapter.
     
  8. aberrero macrumors 6502a

    Joined:
    Jan 12, 2010
    #8
    The fan is right next to the power connector, are you sure thats not what you're hearing?
     
  9. Munch thread starter macrumors member

    Joined:
    Jun 20, 2006
    #9
    It's not the fan, although I thought it was on the other side of the laptop until you mentioned it. Even with the case closed, you can hear a noise so it is coming from the power supply.

    I plugged it into what I think was a properly grounded plug but I still hear a whine from the actual adapter, and I think the mag safe as well.

    Is anyone else experiencing this?

    On another topic, the magsafe magnet is too strong. If someone trips over the cord, I am positive my laptop will go flying because of the design of the connector. I can pull the cord and my laptop is dragged.
     
  10. aberrero macrumors 6502a

    Joined:
    Jan 12, 2010
    #10
    Ya, the magsafe is way too tight on there, totally different than the one on the MBP/MB.

    Also, the fact that it is at a 90 degree angle makes it kind of awkward. I don't know why they did it like this.
     
  11. GeekLawyer macrumors demi-god

    GeekLawyer

    Joined:
    Jun 2, 2007
    Location:
    The post is coming from inside the house!
    #11
    Yeah, I wouldn't mess around with that. I'd take it back for a replacement.
     

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