はじめに
This guide will take you, step by step, through the process of determining if the repair is likely to succeed, and how to accomplish it
必要な工具と部品
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Start by examining the cable for any obvious cracks, holes or exposed wires
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Using a multimeter or continuity tester check to see if the pins are shorted
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There are five pins in the plug end. The central one is used for signaling but the other four are used to carry power to the mac. Because the mag safe adapter is designed to be able to used in any orientation the outer pins (1 and 5) are equivalent and should show as connected when using the multimeter.
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The same should be true for the middle pins (2 and 4).
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If however any of the other pins appear to be connected, you have a short. In this case pins 1 and 2 are shorted.
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Strip the ends of the cable and use a multimeter to check that these leads are no longer shorted
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If your continuity tester still shows a short, the cable may be damaged elsewhere, check again for any signs of damage - maybe you just need to shorten it a few more inches
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If you can't find the source of the short outside the adapter, you're going to have to open the adapter itself and continue there (see other guides for details on how to accomplish this)
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Assuming you've confirmed the leads are not shorting the next step is to plug the adapter back in and check to see if power is still being delivered
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Use a multimeter to check that power is available. it should read around 6.8V DC
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If you've got power, congratulations, you can continue to repair the plug, otherwise you will need to dig deeper (look for other guides on repairing the adapter itself)
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once the plastic has been cleared away you should see a small green circuit board with the remnants of the wires you cut off earlier still attached
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Use a soldering iron to melt and lift away the old wires
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NOTE: Pay attention to where the leads go so you can reconnect them to the same place when it's time for re-assembly But it should be fairly obvious that the shield wire has been split into two strands and soldered to the back and front of the circuit board, with the central wire (covered with a white insulator) connected directly to the bottom left corner of the circuit board.
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reattach the leads starting with the central (white) strand directly to the PCB
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Then solder one strand of the shield to the opposite side of the circuit board
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Flip the plug over and solder the remaining end of the shield to the opposite side
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Hint: The goal here is to make sure that the divided shield distributes any strain equally between front and rear sides and avoids straining the central wire
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To finish up;
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slide the grommet back down to the end of the cable and use a pair of pliers to gently squeeze the metal clamp shut again
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Optionally seal the PCB with Areldite or perhaps hot glue but you can get by just fine without
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Slide the plastic cover back down over your work - it'll probably be tight enough to snap back into place but if not a couple of drops of super glue should be enough
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If all is well, you should get many more years from your trusty adapter.
If all is well, you should get many more years from your trusty adapter.
47 の人々がこのガイドを完成させました。
11 件のコメント
I have the newer cylindrical adapter, can that be repaired as well in a similar way?
Did anyones MBP get insanely hot after doing this to the charger?
i just want to thank you for the guide. I had the same problem and got it fixed.
Thien Chau - 返信
On www.magsafetester.com you can find a device with which you can test your adapter.
Dear author,
I would like to know if it is possible that there are two mistakes in your guide that you might have missed. Both are very little things, or perhaps I am just completely mistaken.
1) In step 14, shouldnt it be that pins 1 and 5 do not short with 2 and 4, instead of 2 and 3?
2) In step 15, isnt it “Araldite” the product you use instead of “Areldite”?
Thanks in advance for checking that. I just want the highest of qualities for your guide, so that no one gets confused when using it. Have a great day.
