Finger "jumps" when touching the aluminium shell

Discussion in 'MacBook Air' started by ad1815, Aug 27, 2013.

  1. macrumors member

    Joined:
    Oct 30, 2012
    #1
    When I move my fingers on the aluminium shell, I feel that my finger "jumps" on it. I only feel it when the Mac is connected to a power supply; I don't feel it when the computer is disconnected from the power supply.

    Anyone has the same feeling? Anyone knows why?
     
  2. macrumors member

    Joined:
    Mar 13, 2005
    Location:
    Ames, IA
    #2
    I've noticed the same thing. The computer is electrically grounded through the shell, so I would image a little bit of electricity is leaking out through your finger. I've tried to show it to other people but they never seem to be able to feel it. I imagine it might go away if you used a grounded power plug, like the extension cable that came with the power supply. Never tried though.

    Ken
     
  3. jqc
    macrumors regular

    Joined:
    Jun 30, 2007
    #3
    I feel this on my 2010 MBA as well as when my iPhone 5 is charging (the back aluminum part)
     
  4. macrumors 6502a

    Joined:
    Jan 5, 2011
    #4
    Yall be trippin.
     
  5. macrumors regular

    Joined:
    Aug 4, 2005
    Location:
    Gothenburg, Sweden
    #5
    Nope, both my MBAs (2011 and 2013) exhibit this behavior. It's very easy to feel. The behavior is normal when not having the unit grounded.
     
  6. macrumors 6502a

    Joined:
    Mar 11, 2011
    #6
    Same here. Felt it on MBA 11", 13" and rMBP.
     
  7. macrumors 65816

    Joined:
    Apr 17, 2012
    Location:
    Destin, FL
    #7
    Happens when I touch my GF and my mac at the same time. No kidding.
     
  8. macrumors 604

    chrono1081

    Joined:
    Jan 26, 2008
    Location:
    Isla Nublar
    #8
    I don't feel it on my Macbook Air but I felt it on my Macbook Pro.
     
  9. macrumors 603

    notjustjay

    Joined:
    Sep 19, 2003
    Location:
    Canada, eh?
    #9
    Noticed this too on my 2007 MacBook Pro. Doesn't happen all the time. Maybe it happens when the outlet I'm plugged into is badly grounded. Could also have to do with the way the MagSafe connector is seated. One time I felt the tingling and then when I reached over to disconnect the MagSafe connector and re-connect it, I got a painful shock when I touched it. Looks like it may have been seated incorrectly.
     
  10. macrumors regular

    Joined:
    Jun 23, 2013
    Location:
    United Kingdom
    #10
    I've read a previous thread that mentioned this issue is sometimes corrected when using the longer lead with the MagSafe power adapter due to the grounding :confused:
     
  11. macrumors newbie

    Joined:
    Aug 30, 2013
    #11
    This is because the power adapter you are using does not have grounding . Change it with a connector that has 3 "pins" will solve the problem.
     
  12. macrumors regular

    Joined:
    Aug 4, 2005
    Location:
    Gothenburg, Sweden
    #12
    It doesn't just fix it sometimes, it always fixes it. The longer lead has ground pins, which the other plug doesn't. As long as the wall socket is actually grounded, it will make the issue disappear. For this reason, I always use the long lead.
     
  13. L T
    macrumors 6502

    L T

    Joined:
    Feb 24, 2013
    Location:
    UK
    #13
    I've noticed that when my MBA is charging and I plug in my powered external hard rive the metal end of the USB sparks on the aluminium

    ----------

    How about in the UK? All of our plugs have 3 pins!
     
  14. macrumors 6502a

    Yaboze

    Joined:
    May 31, 2007
    Location:
    The Garden State
    #14
    My white MacBook would do this when I would touch one of the screws in the plastic, I'd get a little zap that wasn't static.
     

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