Soldering a USB-C connector instead of a MagSafe2 connector

Discussion in 'MacBook Pro' started by shaharkadmiel, Oct 17, 2017.

  1. shaharkadmiel macrumors newbie


    Oct 17, 2017

    I have a 2016 TouchBar MacBook Pro 15". I have an old 85W charger with a MagSafe2 connector at the end. I need an extra charger for my current MacBook Pro and that requires a USB-C connector.

    Is there a reason why I shouldn't be able to cut the MagSafe2 connector and solder a USB-C connector instead? Sure, I would have to check out the pinout of the connector and solder to the right terminals but did apple change anything internally in the power adapter itself? Are any of the other wires in the USB-C cable used for any kind of communication between the connector and the charging brick?

    I would very much like to hear about someone who attempted this.

  2. negativzero macrumors 6502a

    Jul 19, 2011
    Because MagSafe outputs voltage at 14V and higher while USB-C is 5V. It will blowout the MacBook. Nothing wrong with the connector end, its the power brick.
  3. leman macrumors G3

    Oct 14, 2008
    And you also need to add the chips for negotiating the USB power link... unfortunately, this is not the era of home-made radios anymore ;)
  4. Nilhum macrumors regular


    Dec 20, 2016
    Buy a new charger. Why would you even risk such an expensive device by soldering?
  5. shaharkadmiel thread starter macrumors newbie


    Oct 17, 2017
    You are mistaken...

    From the MagSafe2 charger:
    Output: 18.5V - 4.6A, 16.5V - 3.6A

    From the USB-C charger:
    20.2V - 4.3A (USB PD) or 9V - 3A (USB PD) or 5.2V - 2.4A

    so while charging, the voltage and the amperage are quite similar. I don't really know what the other values mean though...
    --- Post Merged, Oct 17, 2017 ---
    Because its a challenge!
    --- Post Merged, Oct 17, 2017 ---
  6. Fishrrman macrumors P6


    Feb 20, 2009
    OP --

    Why don't you go ahead with your plans, and have a video camera aimed at the MacBook the first time you plug it in, to record the results? (and then post them here)
  7. jerryk macrumors 601

    Nov 3, 2011
    SF Bay Area
    USB-C Power Delivery is not just providing power to certain pins. There are specs that have to be met and handshaking between the power supply and the device being charged to ensure that the power supply provides power at the right voltage and current. Voltage can range from 5V to 20 volts and current from 0.5 Amps to 5 Amps.

    See this and subsequent links for the details

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7 October 17, 2017