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The first-generation 12" Retina MacBook has a design quirk that requires connection to low-voltage power after a repair. If this step is skipped, permanent logic board damage may result. This procedure is not required for 2016 and later models.

Connecting the Retina MacBook to low-voltage power requires a 5-Watt A/C adapter (like the kind that comes with iPhones) and a USB-A to USB-C cable, neither of which is included in the MacBook's original box.


Инструменты не указаны.

  1. Using a USB-A to USB-C cable, connect your MacBook to a standard 5 W iPhone wall charger.
    • Using a USB-A to USB-C cable, connect your MacBook to a standard 5 W iPhone wall charger.

    Just posting a comment to reinforce the fact that applying the low voltage power is necessary. Don’t skip doing it or you may ruin your (probably expensive) replacement logic board!

    David Manley - Ответить

  2. Plug the charger into a surge-protected A/C outlet.
    • Plug the charger into a surge-protected A/C outlet.

    • Wait until you hear the power connect chime (you should also see the battery charge symbol onscreen).

    • You'll typically hear the chime in 10 seconds or less—unless your battery charge level is very low, in which case it may take up to 15 minutes.

    • Power on your MacBook by pressing the power button.

    • Once the MacBook successfully powers on, you can disconnect the 5 W charger, and use/charge your MacBook normally.

    • If the MacBook fails to power on after 15 minutes, there may be an issue with your repair.

    This is quite scary. I wonder what the technical explanation for this behaviour is?

    Is it safe to just power it up using the built in battery? And then once it powers up, plug in the normal charger?

    Cool_Breeze - Ответить

    Is this necessary for the MacBook Pro (Retina, 15-inch, Mid 2015) 2,2 GHz Quad-Core Intel Core i7

    Where do I plug the usb c cable ? I can’t see any suitable port

    sissi - Ответить


To reassemble your device, follow these instructions in reverse order.

23 участников успешно повторили данное руководство.

Jeff Suovanen

Участник с: 06.08.2013

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iFixit Участник iFixit


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Комментариев: 8

I recently did an upper disassembly on my MacBook 2015 and was doing the steps for a low voltage power up but when I plugged the power in the MacBook made the startup noise for a second then restart and did it again in these short cycles. I’m wondering if I improperly did the start-up process or perhaps something else is going on?

John Wiedemer - Ответить

Hi John, I have the same problem, have you found a solution ?

maxime.duret -

What sort of logic board damage might happen if this step is not followed? One of our customers brought us his 2015 MacBook after attempting to replace the battery himself. The new battery is not recognized, and the computer shuts off after about a minute even when plugged in. Could this be the result of him not applying the low voltage power?

clover - Ответить

Did a batter replacement and woops… used a 10W supply for 15 minutes.

Then noticed my mistake and changed to 5W supply, but computer does not start at all.

Could this be the “logic board damage” mentioned?

Niels Koldsø - Ответить

I just replaced a new battery on my MacBook ProRetina Pro early 2015 and bought this cable and adapter after following all the steps and instructions but when I plug the cable in, the display screen is still off (black) no chime sound of battery charging symbol on the screen. I plugged everything back in correctly and followed the steps exactly how they said and my mac won’t display anything. What could be wrong?

Ervin Valdez - Ответить

hello, after battery replacement, I followed the low voltage start up however I got repeated chime noises on boot with a blank screen. I have yet to attach the adapter that came with it. It is a early 2015 model. Any help would be great.

roohi vad - Ответить

Is a 2.5 Watt charger sufficient to get the job done, or will the laptop not turn on at all?

Stefanie Sulzer - Ответить

Does this step apply to the MacBook Pro (Retina, 15-inch, Mid 2015) A1398 ?

I wanna replace the trackpad, but mac doesn’t have a USB c port, should I use some sort of adapter or just skip the step?

Please reply

sissi - Ответить

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