ACD LED charging Macbook Pro = Audio hissing (loud)

Discussion in 'MacBook Pro' started by shiny-blanket, May 11, 2009.

  1. shiny-blanket macrumors member

    Joined:
    Sep 21, 2007
    #1
    Help,

    Recently purchased a 24" Cinema display along with a 15" macbook pro. The screen has yellow fringing on the edges (apparent on the discolored menu bar) and some dust under the glass.
    I can live with this, however I've just noticed when the macbook is charging from the display it causes a really loud electrical hissing sound from the speakers. Remove the charger and it's fine.

    Has this been reported as a widespread problem, or is it local to my display?
     
  2. jlpoore89 macrumors 6502

    Joined:
    Feb 16, 2009
    Location:
    Beaumont, Texas
    #2
    First off I am really sorry for your discoloration and dust. I managed to get what seems to be a perfect LED ACD.

    But anyways is this hissing coming out of the laptop, display, or external speakers???

    On my old MBP if I had something like a printer plugged into a USB port a hissing noise would come out of my external speakers if they were turned up loud with nothing playing. It was just the ground current being amplified by the external speakers.

    I do not seem to have this problem using mine in lid closed mode with external speakers plugged in.
     
  3. shiny-blanket thread starter macrumors member

    Joined:
    Sep 21, 2007
    #3
    It's definitely the speakers. Pressing my palm onto the unibody makes the frequency change. Could it be a shielding issue or something wrong with the display?

    I've just removed the ACD charger and plugged in the portable charger and there's no hissing.

    Just got a shock from removing the charger :(

    Won't be plugging that back in.
     
  4. jlpoore89 macrumors 6502

    Joined:
    Feb 16, 2009
    Location:
    Beaumont, Texas
    #4
    Yeah that's not normal. A little hissing is normal due to shielding and grounding, but a loud hiss and shock is not normal at all!!! And if it doesn't happen with your regular charger plugged in then it is definitely a problem with the display. And for $900 it sure as hell shouldn't attempt to electrocute you. If your within your 14 days exchanging should be a breeze if not it still shouldn't be hard because it shocked you and its a liability to Apple.

    So I would definitely contact Apple whether it be a store or AppleCare immediately,
     
  5. Mactagonist macrumors 6502a

    Joined:
    Feb 5, 2008
    Location:
    NYC - Manhattan
    #5
    Why would you be willing to live with any problem in your brand new product? Be it discoloration, dust in the screen or hissing, take it back.
     

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