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Introduction

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.

  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.

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  3. 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.

Conclusion

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

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Jeff Suovanen

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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 - Réponse

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 - Réponse

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