Noise coming from Macbook Charger when Scrolling??

Discussion in 'MacBook Pro' started by Simber, Dec 15, 2015.

  1. Simber macrumors newbie

    Joined:
    Dec 3, 2015
    #1
    Hey guys, after just getting my macbook fixed from staingate, I've noticed a new problem: when it is being charged from a power adapter, there is a static noise coming from the charger when im scrolling using the two fingers (im sitting at my desk and i can hear it in a quiet room, verrry noticeable when i put my ear on to it). When the macbook is unplugged and powered by battery, there is no noise.

    Cause for concern? should i avoid using the charger? would this be replaced under warranty?

    Regards, Simon
     
  2. RoboWarriorSr macrumors 6502a

    Joined:
    Feb 23, 2013
    #2
    was the charger grounded properly?
     
  3. Simber thread starter macrumors newbie

    Joined:
    Dec 3, 2015
  4. Simber thread starter macrumors newbie

    Joined:
    Dec 3, 2015
    #4
    So I've tried grounding it, and there is still noise coming from it.

    Sometimes is disappears, but when the noise returns, it is louder when i scroll or do anything that requires the computer to compute something (e.g. close a tab on google chrome)

    I've run a diagnostic test at the startup by pressing D, and said there were no problems...
     
  5. RoboWarriorSr macrumors 6502a

    Joined:
    Feb 23, 2013
    #5
    I know when I used Parallel and the charger wasn't grounded I could hear static noise, all disappeared once I used the longer adaptor but could it be the wiring in the building you're in? That's the only reason that I could think of. Before stopping by an Apple Store if one is nearby, try using the machine plugged in another building and see if that fixes it. If it doesn't I would stop by an Apple Store and ask them about it.
     
  6. Gav2k, Dec 16, 2015
    Last edited: Dec 16, 2015

    Gav2k macrumors G3

    Gav2k

    Joined:
    Jul 24, 2009
    #6
    Just a note.

    The charger is only 'grounded' when using the extension cable. It's not grounded when using the duck head.

    This is likely just capacitor noise, which occurs with slight heat-generated vibration between the components of capacitors and circuit boards that are subjected to ac. Since ac switches direction at about 60Hz, you may hear a buzzing sound at about this frequency.
     

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