Repairing 85W MagSafe

Discussion in 'Mac Accessories' started by Wreckie, Aug 30, 2014.

  1. Wreckie macrumors regular

    May 9, 2011
    Trying to identify the R14 resistor value, anyone who has repaired this or has circuit schematics, please help.

  2. Mildredop macrumors 68020

    Oct 14, 2013
    Why does a power adaptor need all that anyway?
  3. MCAsan macrumors 601


    Jul 9, 2012
    because it auto adapters to different line voltages to provide the same output. Power supplies are not dumb transformers as in years past.
  4. Askemaya macrumors newbie

    Feb 7, 2015
    Did you find a fix?

    Hey were you able to determine the original value for that resistor (r14)? I have this exact problem. The charger shipped with an early 2008 MacbookPro.
  5. Wreckie thread starter macrumors regular

    May 9, 2011
    Unfortunately not. I think the only way to find out is take working one into pieces and find out, would be cheap repair anyways.
  6. Crzyrio macrumors 65816

    Jul 6, 2010
    I can get this for you guys in a week or so!

    I have a working magsafe adapter where just the wire is severed at the very beginning and am unable to solder it back without opening the enclosure.

    How did you go about opening the adapter all together? If I have time this week, Ill give it a go.
  7. kick26 macrumors newbie


    Sep 3, 2009
    When I opened my brothers to solder/tape the cord back together, I followed some instructions on instructables where you start with a needle nose pliers to push apart the outer shell at pop up cord winding ears.
    and with a liberal use of a flat head screwdriver. Once I got it started with the pliers, I inserted and moved a flat head screwdriver along the groove along the skinny sides of the shell, gradually popping them apart. It will leave some marks on the plastic but not nearly as much damage as using a flat head alone (or more destructive methods) to try to separate the halves.

    hope this helps
  8. Crzyrio macrumors 65816

    Jul 6, 2010
    The inside of mine looks a little different from the picture you posted OP. Ill post a pic later.

    That worked perfectly! Thanks
  9. Wreckie thread starter macrumors regular

    May 9, 2011
    Did you get the picture of PCB? The Circuit board is covered with metal cover which can be easily taken apart, then you can see all the resistors and stuff.

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