Does a dead iPhone charge when connected to Mac instead of Wall?

Discussion in 'iPhone' started by mnya, Feb 13, 2013.

  1. mnya macrumors member

    Joined:
    Jul 20, 2012
    #1
    My iPhone is dead (battery ran out.)
    It would turn back on when charged to a power outlet with a USB adapter.
    But I think my USB adapter just broke and is not charging, so I'm trying to charge the phone with a Mac for this moment.
    It usually charges this way when the iPhone's not dead.
    But right now it's dead, and it's not turning on after connecting to my Mac and waiting for a while.
    Is it that when an iPhone's dead, it can only charge by connecting to a wall, and not Mac? Or, if there is no such rule, then I think my USB cable may also be broken...
     
  2. Appl3FTW macrumors 601

    Appl3FTW

    Joined:
    Nov 15, 2012
    #2
    ur mac should be active and not in sleep mode. try a different cable as well. if anything ur probably have a bad charging port.
     
  3. Interstella5555 macrumors 603

    Interstella5555

    Joined:
    Jun 30, 2008
    #3
    Not true, I can charge of my MBP when it's closed and asleep.
     
  4. Ste Nova macrumors 6502

    Joined:
    Jan 20, 2012
    Location:
    LL22, UK
    #4
    same with my dell laptop, there is a setting in the bios to power the usb's till 75%/50%/25% of battery left in laptop
     
  5. takeshi74 macrumors 601

    Joined:
    Feb 9, 2011
    #5
    How long is "a while"? If it's dead it will take a long time (especially if it's a 500mA USB port) before you can power it on.
     
  6. Appl3FTW macrumors 601

    Appl3FTW

    Joined:
    Nov 15, 2012
    #6
    oh it's true :rolleyes:
     
  7. Interstella5555 macrumors 603

    Interstella5555

    Joined:
    Jun 30, 2008
    #7
    True that it takes longer to charge? Yes. True that you can't charge? Completely false.
     
  8. Brian Y macrumors 68040

    Joined:
    Oct 21, 2012
    #9
    Actually, it depends on the model, and whether the machine was asleep when it was plugged in or not. It's not as simple as "it will" or "it wont".

    Also, the Mac will provide the same power output to USB when awake as when its asleep (it's the same controller) so it wont charge any slower, that's false.
     
  9. Interstella5555 macrumors 603

    Interstella5555

    Joined:
    Jun 30, 2008
    #10
    Slower than wall charging and every MBP I've owned or worked with has had this functionality. If the computer is below a certain battery percentage, then no, the phone won't charge.
     
  10. Brian Y macrumors 68040

    Joined:
    Oct 21, 2012
    #11
    Actually, more recent machines (2008-9 onwards) supply 1100ma at 5v which is 5.5w.

    The iPhone's USB charger supplies 5w of power, so charging an iPhone via USB on one of those will be 10% quicker than using the wall plug.

    With the iPad 10w charger - this will charge an iPad twice as fast as the iPhone adapter will, but an iPhone will only ever draw 500ma from it - so via USB is by far the fastest way of charging an iPhone.
     

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