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.

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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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.

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Conclusion

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

Jeff Suovanen

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