1 2 3 4 Previous Next 51 Replies Latest reply: Oct 17, 2007 1:32 PM by northwick
siix Level 1 Level 1 (20 points)
I got this painfull shock as if you have been pierce by a needle to your forearms.
The shocks are actually from the screws at the side of the MacBook Pro. You can test it by the following method while the power plug are connected.

1. Extend your forearms and let it touch with the screws.
2. Use a "Test-Pen" and touch all the screws. It will lighted up !! Even the "On" button has it.

You won't get it if the MacBook Pro are running with Batteries.

MacBook Pro 1.86 - 80gb - 512mb, Mac OS X (10.4.6), Ex Apple//GS, //e, //c, //+ & iBook G4 user
  • 1. Re: Electric shock from  MacBook Pro while charging only.
    dliao Level 1 Level 1 (95 points)
    somoone have reported a similiar problem before and I would recommend contacting Apple ASAP. Someone posted a burnt magsafe on flickr before simply leaving it on charging and I guess his cat walked by it.
  • 2. Re: Electric shock from  MacBook Pro while charging only.
    CoDA Level 1 Level 1 (0 points)
    I'm getting the same problem. Mini electric shocks when touching any metal part of the MBP. (on charge only)

    Other than being quite warm my MBP has been flawless (W8609)

    I wonder what can be done about the electric shock situation.

    No-one should have electric shock therapy unless absolutely required - Thanks Steve (typing this whilst still getting little shocks......)

    MBP2.16   Mac OS X (10.4.6)   2GB Ram 120GB 5400rpm
  • 3. Re: Electric shock from  MacBook Pro while charging only.
    Bill_R Level 2 Level 2 (325 points)
    It sound like you are using the two prong that you connect directly to the brick. Try taking that out and putting in the long cord with the three prongs on it. I beleive that your problem will go away.
  • 4. Re: Electric shock from  MacBook Pro while charging only.
    CoDA Level 1 Level 1 (0 points)
    No 2-pin plug here. 3-pin (3rd being earth pin)

    Usually this occurs when earth potential in your house system, starts to float or when the cheap chinese laptop OEM's make dodgy power supplies that have design issues.

    I hope the latter is not the case with my MBP. Otherwise apple have another disatisfied MBP customer and I'll my best to get it resolved or warn other people away from MBP purchases - I have had enough of Win/Cheapo laptops, and I thought this would be over once I got an apple - so much for the dream; (continuing mini shocks....)
  • 5. Re: Electric shock from  MacBook Pro while charging only.
    Koo Chuan Hoe Level 1 Level 1 (0 points)
    you need to connect the power to the long cable with grounding
  • 6. Re: Electric shock from  MacBook Pro while charging only.
    CoDA Level 1 Level 1 (0 points)
    Thanks for the tip KCH.

    Maybe something is getting lost in translation.(see my previous pos)

    I am using the the 3-pin/3-core cable. The system is grounded/earthed correctly. (from the laptop side)

    Now I have pixels dying on my MBP. (3 so far)

    I'm far from happy.(in fact quite ****** off!)
    Apple will need to sate my dissatisfaction. As far as I'm concerned, they build quality is not much better than the rest of the laptop munufacturers out there.

    So much for being "something special" Steve....I'm contemplating returning my MBP and getting a full refund.
  • 7. Re: Electric shock from  MacBook Pro while charging only.
    H F Cohen Level 1 Level 1 (125 points)
    It would be interesting to actually measure the leakage current you are feeling. The maximum permitted is 3.5mA for earthed accessible metal and 0.25mA for unearthed accessible metal.

    FLOATING CIRCUITS – PROTECTION AGAINST ELECTRIC SHOCK
    http://ewh.ieee.org/soc/emcs/pstc/TechSpk/floating.html

    Dual 1 GHz Power PC G4   Mac OS X (10.3.7)  
  • 8. Re: Electric shock from  MacBook Pro while charging only.
    siix Level 1 Level 1 (20 points)
    Very interesting. By attaching the extended cable which consist of the 3 pin plug, there isn't any electric shock. Confirmed with the test-pen there isn't any current flow at all the screws. One thing the manual did not have any caution or explainations to user of MBP to use the extended cable in case they experience the electric shock. I hope they have some revision on their manual.

    Now I'm happy and feel safe.....but I got a very long cable with me!!!
  • 9. Re: Electric shock from  MacBook Pro while charging only.
    Digital Dude Level 4 Level 4 (1,685 points)
    Actually, the users guide does state: “The AC power cord provides a grounded connection." (page 30) and, “For best results, always use the AC power cord and connect it to a grounded power outlet when one is available.” (page 31).
    Regards,

    2.16 GHz MacBook Pro (W8612...), Dell 620 WorkStation (XP Pro)   Mac OS X (10.4.6)   G4 Tower (OS 9/10), Dell 620 WorkStation (XP Pro), Gateway P4 (XP Home)
  • 10. Re: Electric shock from  MacBook Pro while charging only.
    siix Level 1 Level 1 (20 points)
    Actually, the users guide does state: “The AC power
    cord provides a grounded connection." (page 30) and,
    “For best results, always use the AC power cord and
    connect it to a grounded power outlet when one is
    available.” (page 31).


    The term "grounded" should be put it the simplest form of explaination so that it will be better understand for other user who might not know it.

    Just a suggestion....
    "The AC power cord provides a better protection if you experience uncomfortable electric tingling sensations while operating the MacBook Pro" (page 30) and , "For best protection, always use the AC power cord whenever possible." (page 31).

    .

    MacBook Pro 1.86 - 80gb - 1 GB   Mac OS X (10.4.6)   Ex Apple//GS, //e, //c, //+ & iBook G4 user
  • 11. Re: Electric shock from  MacBook Pro while charging only.
    Bob Maher Level 3 Level 3 (680 points)
    The true, fact of the matter is, that Apple needs to stop shipping the brick with the two prong un-grounded ploug. That simple. It is just not safe.

    Bob
  • 12. Re: Electric shock from  MacBook Pro while charging only.
    H F Cohen Level 1 Level 1 (125 points)
    Does anyone with a MBP have access to an ohmmeter? I would like to know the impedance between the MBP case screws and the ground pin at the end of the power supply cord that plugs into the wall outlet. IMPORTANT !!... Do not try to make this measurement with the power supply cord plugged into the wall outlet or with the computer on.


    Dual 1 GHz Power PC G4   Mac OS X (10.3.7)  
  • 13. Re: Electric shock from  MacBook Pro while charging only.
    Randall Schulz Level 3 Level 3 (800 points)
    H.F.,

    I measure 1 KΩ between the screw closest to the MagSafe socket and the ground pin of the power plug (U.S. version). As expected, the value is the same between the case and the ground connector pin on the power brick. (As you know, the power brick accepts two power connectors, one that has no cord and two prongs and the other that has a cord and three prongs). Shorting the leads on the multimeter shows ≈ 3Ω (of course, I have to change the meter's range to get that value).


    Randall Schulz

    iMac 20" Core Duo; MacBook Pro   Mac OS X (10.4.6)  
  • 14. Re: Electric shock from  MacBook Pro while charging only.
    erik graham Level 3 Level 3 (645 points)
    hey Randy,

    Can you bottom line that for us? What do those readings mean? Are they good or bad?

    And is it just me, or does this whole discusion about grounding seem odd. I mean how can "slight electrical shocks" be acceptable under any circumstances, grounded or not? I can't think of any other electronic device in the history of the universe where this would be considered OK.
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