Applying Low Voltage After Every Repair (Retina MacBook 2015 Only)

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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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