Nü member: srs question for the guru's

Discussion in 'MacBook Pro' started by 2.8-350TBI, Dec 16, 2010.

  1. 2.8-350TBI macrumors newbie

    Joined:
    Dec 16, 2010
    #1
    Hey, I am in urgent need of some advice.

    My macbook pro's charger (bought new from apple last aug) went out and I have 25% battery left.

    Does anyone know the pinouts of the magsafe plug and the voltage and amperage required by the battery?

    I can easily make a power source but I need the pinouts and polarity to keep my 'book from dying.

    PLS HELP THIS IS URGENT
     
  2. Intell macrumors P6

    Intell

    Joined:
    Jan 24, 2010
    Location:
    Inside
    #2
    The Magsafe connector is patented by Apple and they have not allowed others to make one. Finding out the proper pin outs will be hard and making it charge will be even harder. Because as of this writing, only Apple Magsafe connectors have been able to charge a Macbook /Pro /Air.
     
  3. 2.8-350TBI thread starter macrumors newbie

    Joined:
    Dec 16, 2010
    #3

    Of course it is, but I am not making it
    I am simply cutting the cord off after the transformer and wiring in my own power supply.

    It would be as simple as taking a dmm to the pins and measuring the voltage, but since mine is dead I cant do it.


    I am at 23% now
     
  4. Apple OC macrumors 68040

    Apple OC

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    Oct 14, 2010
    Location:
    Hogtown
  5. Intell macrumors P6

    Intell

    Joined:
    Jan 24, 2010
    Location:
    Inside
    #5
    The part that most likely failed is the connection going into the connector or the connector itself. The power brick is usually still in working order.
     
  6. 2.8-350TBI thread starter macrumors newbie

    Joined:
    Dec 16, 2010
    #6
    I really wish I had the time to wait until a new one got here.

    But what is their number? I will give them a try.
     
  7. Apple OC macrumors 68040

    Apple OC

    Joined:
    Oct 14, 2010
    Location:
    Hogtown
    #7
    better to just go to an Apple store if you can
     
  8. 2.8-350TBI thread starter macrumors newbie

    Joined:
    Dec 16, 2010
    #8
    My local mac store (where I bought the charger)

    "you have no warranty and no returns allowed after 14 days. Sorry"

    Me: WTF I paid 80 dollars for this thing after I lost the original :(
     
  9. Intell macrumors P6

    Intell

    Joined:
    Jan 24, 2010
    Location:
    Inside
    #9
    You could always take it in and play (be?) stupid and ask why it isn't working. Most of the time they'll replace it.
     
  10. Apple OC macrumors 68040

    Apple OC

    Joined:
    Oct 14, 2010
    Location:
    Hogtown
    #10
    go back ... be very nice and ask for the manager
     
  11. Richard1028 macrumors 68000

    Joined:
    Jan 8, 2009
    #11
    Holy crap. Who has time to re-engineer Apple's magsafe pinout much less string one together?

    $25 on ebay.
     
  12. 2.8-350TBI thread starter macrumors newbie

    Joined:
    Dec 16, 2010
    #12
    $17 shipped and its on its way lol

    I will try putting it together tonight, so wish me luck.

    If I dont post soon, its cuz it didnt work and my bat is dead XD
     
  13. 2.8-350TBI thread starter macrumors newbie

    Joined:
    Dec 16, 2010
    #13
    Have some faith in the DIY'er!

    So, this post means that the computer didnt die!

    Immediately after seeing my girl I came back and the book was at 4% so I got to work in a jiffy.

    I already have another charger on the way, so I thought; "what could I lose its a broken charger" so I cut the cord off and to my pleasant surprise there were only two conductors inside it. One outer (which is always ground/-) and one inner, which is positive. And I read the printing on the bottom side and it said 16.5V/3.5 amps dc.

    I hooked it up straight to my sound system, which runs on a small 12V motorcycle battery and the green light turned on, but no charge, so I knew I had to have more voltage, but where????

    And I remembered the lipo charger (runs on the 12V system) I use on my RC cars has up to 22 vots and quite a few amps so I set it to 16V 3 amps and it didnt work due to a voltage check by the charger.

    So I tricked it by using two 9v batteries in series until it gave some juice, and voila orange light behold.

    But it was giving close to 20 volts while charging so I backed it to 14 volt charge at 3 amps, and now were hovering at 16.8V 1 amp.

    Its gonna take forever to charge, but it will keep me online until the ebay charger gets here.

    Heres a few pics:

    [​IMG]

    [​IMG]

    [​IMG]
     
  14. rmbrown09 macrumors 6502a

    rmbrown09

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    Jan 25, 2010
  15. 2.8-350TBI thread starter macrumors newbie

    Joined:
    Dec 16, 2010
    #15
    Desperate times call for desperate measures lol
     
  16. Gr80Likes2Boogi macrumors regular

    Joined:
    Oct 3, 2009
    Location:
    NoHo, CA
    #16
    That is wacky, kooky, mickey-moused, jerry-rigged, totally unstable, possibly dangerous, kinda unnecessary, sorta dumb, and pretty sweet.

    Well done, impatient one.
     
  17. 2.8-350TBI thread starter macrumors newbie

    Joined:
    Dec 16, 2010
    #17
    I take all of the above except totally unstable.

    Its meant to charge lipo cells, and is fully regulated! :eek:
     
  18. Fubar1977 macrumors 6502a

    Fubar1977

    Joined:
    Jul 30, 2010
    Location:
    North Yorkshire, UK
    #18
    Your ingenuity and persistence impresses me greatly. :)
     
  19. Tyler23 macrumors 603

    Tyler23

    Joined:
    Dec 2, 2010
    Location:
    Atlanta, GA
    #19
    Dude. You may be crazy..but that is f*ing awesome.
     

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