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Apple Power Adapter Cable Repaired. Model: Magsafe 2

By on November 18, 2017
fluke 112 multimeters











As I went to get my son from school, the American principle of that school and also my friend approached me with a question. He said he as an apple power charger that needed fixing and he asked me if I do such repairs.

He said he had problem with its cable that he added an electrical tape to it and once he did that, the charger stopped working.

apple power adapter cable repair

It is a nice clean one from one side but on the other side it is a different story.

apple power adapter repair

By adding an electrical tape to this bad wire actually shorted the negative and the positive together causing the charger not to function. My only concern is, was it a dead short on the inside or not?

how to fix apple power adapter

It was tricky to open it up. And I needed both hand to open it and I could not take a photo of that process. There are many videos on the internet that explain the way of taking this apart. Once it was open, I saw the metal shield, again, two soldering spots on that shield and it was off.

how to repair power adapter

It looked good on the inside. I could not see any shorted spot and all the capacitors were in good shape; So far so good.

fixing apple power adapter

I soldered the old cable off board, stripped the wires and then add heat shrink tube to the ground wire so I will not short out any component nearby.

repairing apple power adapter

how to fix and repair power adapter

I put everything back together. I added silicon to the wire and glued the rest of the power supply with super glue.

Now, here was my misunderstanding of these chargers.  When I connected the power charger to power and measured the voltage reading there, it showed me only 3.18 DC volts out of 20 volts as it was written on the charger.

fluke 112 multimeter

My question was why it was showing me only that reading instead of 20 volts reading. That troubled me and I thought there was something wrong with the charger. I did not have a laptop to try on and therefore, I was confused.

After checking it out on the net, it was mentioned that it needs a load in order to give the full reading. The only way to test it is to try it on the laptop or add a resister load on it to test it out. The school was nearby so I went there and connected the charger to the laptop and it worked fine.

apple adapter cable repair

Mission accomplished.

This article was prepared for you by Waleed Rishmawi, one of our ‘Master Authors’ and currently working in the Bethlehem area of Palestine repairing electrical and electronic equipment.

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  1. Anwar Shiekh

    November 18, 2017 at 7:25 pm

    The type of silicone rubber that gives off acetic acid (vinegar)?

  2. Parasuraman

    November 18, 2017 at 7:52 pm

    Very good. Typical way of functioning!

  3. Mihai

    November 18, 2017 at 8:12 pm

    Good job Mr. Waleed !

  4. Robert Calk

    November 18, 2017 at 9:32 pm

    Good job, Waleed.

  5. Yogesh Panchal

    November 18, 2017 at 9:49 pm

    Good job! waleed.

  6. Manoj garain

    November 18, 2017 at 10:05 pm

    I have a ultrasim crt tv with a problem.when i switch on, a register in110v supply line near Flyback getting very hot with start but the register blow in 2/3 second.i changed hot.but problem not voltage present 109v from prymary side.please help me

    • Robert Calk

      November 21, 2017 at 9:09 pm

      You may need to replace the FBT. First check for dry joints around the FBT and HOT, and check the HOT snubber capacitor.

  7. Jon Hamilton

    November 18, 2017 at 11:06 pm

    Great video and very appropriate, for me as my cord is just about to break on my mac. Thanks

  8. Albert

    November 19, 2017 at 4:32 pm

    Thanks for this interesting Apple 3V output fact when not loaded!
    I avoid working with those extremely expensive Apple devices. My shop owner friend had a costly Apple repair just recently because the Apple 27 inch iMac A1419 models have changed on how the LCD screens are attached to the glassplate. Now they are both bonded which make them all but repair friendly. They used to be separate items. But Apple changed the nice way how older models simply had a glass plate that was hold by inside magnets. Now the bonded LCD with glass plate is glued to the backshell, and removing that to get to the iMac mainboard is just impossible without breaking the glass! It did cost my friend at least 400 euro/dollar just to replace the old screen before he was able to fix the iMac internal harddisk issues. And he also had to buy the adhesive tape because it neither was included with the new iMac A1419 late 2012 model screen!

  9. Justice

    November 20, 2017 at 6:51 pm

    What interest me the most is the fact that it needed a LOAD to show the correct reading, wow thats new to me.Thanks Waleed.

    • Robert Calk

      November 21, 2017 at 9:39 pm

      It is a good idea to check everything under load if you can, including components and batteries. In my article, , a capacitor checked good, but when I put it under load with an insulation tester, it failed. Sometimes batteries will test good on voltage, but when you put it under a load it will fail.

  10. Zed Pato

    December 1, 2017 at 8:47 pm

    Nice information regarding this repair Mr. Waleed


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