Usb c to usb a: important to use the right side

Discussion in 'MacBook' started by tutux, Jun 29, 2015.

  1. tutux macrumors member

    tutux

    Joined:
    May 4, 2015
    #1
    I noticed somethig with my usb c to usb a cable when using my ipad charger at home:

    On the usb a side no choice to plug it.
    On the usb c if i plug it with the brand of the cable on the top the charger deliver 2W. If i plug it with the the other way, it delivers 10W...

    I tried it several times and now i understand why it was not charging completely over the night few times....

    Now i can use my anker power bank to charge it while i'm using the laptop!

    Can someone test it with another usb c usb a cable!??

    If this is true i think this info is valuable for all of us!
     
  2. brand macrumors 601

    brand

    Joined:
    Oct 3, 2006
    Location:
    127.0.0.1
    #2
    Since USB-C is supposed to be reversible that is very strange.
     
  3. mrkramer macrumors 603

    mrkramer

    Joined:
    Jul 11, 2006
    Location:
    Somewhere
    #3
    Possibly some of the connections on the pins are bad on one side of the OP's connector? I'm not sure if that would end up having the result they are getting or not.
     
  4. Music Lover macrumors member

    Joined:
    May 10, 2015
  5. tutux thread starter macrumors member

    tutux

    Joined:
    May 4, 2015
  6. Wallabe macrumors 6502a

    Joined:
    Mar 15, 2015
  7. tutux thread starter macrumors member

    tutux

    Joined:
    May 4, 2015
    #7
    I'm not questionning why 10W, but why 10W or 2W if connected upside down on the USB C connector side...
    if someone can test, it'll be nice
     
  8. tutux thread starter macrumors member

    tutux

    Joined:
    May 4, 2015
    #8
    So one month later, still the case, I'm looking for a longer USB C - USB A cable.

    So now my config is: Ipad charger + USB A- USB C cable + lighting cable. One charger for all, small form factor!

    It takes longer to charge the macbook, but I charge it as I charge my iphone, overnight :)
     
  9. smacx macrumors newbie

    Joined:
    Jan 2, 2013
    #9
    How long does it take to charge your MacBook with the iPad charger? Is it the 10W or the 12W version?
     
  10. tutux thread starter macrumors member

    tutux

    Joined:
    May 4, 2015
    #10
    10W charger, got it with ipad air 2.

    And can't really say how long it takes as i'm not facing it when charging... i'll say 5/6 hours
     
  11. Fuchal macrumors 68020

    Joined:
    Sep 30, 2003
    #11
  12. zhenya macrumors 603

    zhenya

    Joined:
    Jan 6, 2005
    #12
    I have a couple of cheap cables from ebay and they both only charge in one orientation. I'd say it's probably simpler to just pass the wires through in a single orientation, so the cheap ones don't bother doubling the power lines. A little irritating, but I've been plugging in USB cables one way for years, I can live with it for some $3 cables. Good to hear the better ones don't do that though!
     
  13. ZipZap macrumors 601

    Joined:
    Dec 14, 2007
    #13
    This thread seems a bit pointless since the OP is using a clone cable.
     
  14. macappleguy8 macrumors member

    Joined:
    Mar 14, 2015
    #14
  15. itb165 macrumors newbie

    Joined:
    Dec 2, 2007
    #15
    I'm having a similar problem. My external drive won't mount on my macbook unless my adapter is right side up. Very strange
     
  16. zhenya macrumors 603

    zhenya

    Joined:
    Jan 6, 2005
    #16
    Not too strange when you think about it. These cables are adapting a connector that is unidirectional to one that is bidirectional. In order to make it fully functional in either direction, all of the pins coming from the usb-a port have to be duplicated on the usb-c side. Not surprising that these first generation, inexpensive cables aren't always fully implementing that.
     

Share This Page