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Repair guides and disassembly information for the 14-inch MacBook Pro released in October of 2021, featuring Apple-designed M1 Pro and M1 Max SoCs. Model A2442.

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Three second boot loop

Hi there, I have a 14" MacBook Pro (2021) that starts up when connected to charger, but then restarts after 3 seconds, and repeats the cycle indefinitely. When disconnecting the "battery board data cable" it starts up perfectly fine being connected to the charger only.

Is this a clear sign that the battery board/battery is faulty, or could it also be that there is an issue with the main/logic board? I don't want to replace the battery just to find out that there is something wrong with the logic board. That would be very sad.

Thank you!

Beantwoord deze vraag Dit probleem heb ik ook

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Did you review this guide: MacBook Pro 14" 2021 Vervanging van de batterij taking note of the BMU cable connections and the cable it’s self. I’m suspecting you need a new BMU cable as this one is likely damaged.

Battery management unit (BMU) flex cable P/N 923-06765

I would also install CoconutBatteryso you can see more clearly what’s happening.

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Eric zal eeuwig dankbaar zijn.
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