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2021年10月に発売された14インチMacBook Proの修理ガイドおよび分解情報。Apple設計のM1 ProおよびM1 Max SoCを搭載。モデル番号A2442。

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MacBook Pro 14" A2442 flat battery

Went out on vacation last week and don't remember if I shutdown my MBP 14". When we came back on Friday and tried to power on the laptop, initially it was not powering on, so we tried connecting the MagSafe 3 for us to know whether it was going to take the initial charge. As these newer models work with the internal chip reconizing power before it enters to the mainboard, the laptop cannot take any power if the battery is 0%.

After realizing that MagSafe was not working, I tried my wife's iPhone's USB-C to USB-C and connected it to the MBP power brick. When doing that I saw the battery in red which indicates that the battery is fully drained. This had happened twice and connecting the USB-C from the iPhone helped charging the laptop for 10 minutes and then MagSafe worked perfectly - but this time it didn't work at all.

Tried out DFU "revive" with no luck as I tried connecting both laptops using the same iPhone USB-C cable and no power connected to any of them.

Need to know whether I get a USB-C 3.0 will help for me to start the process of DFU (as it didn't work with the iPhone cable).

Will this resolve my battery issue, should it be better to leave the laptop charging with the MagSafe or USB-C overnight?

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If you got the low battery icon on the screen you likely just need to let the system charge a good four hours at a minimum.

As far as chargers, the Wattage of the Charger is the clue not if powered by the MagSafe port it the USB-C port. That's not to say one or more of the ports isn't having an issue, or even the cord.

There are two charger options for your system which can power thru either the MagSafe or USB-C ports with the correct cable:

  • 140W USB-C Power Adapter + USB-C to MagSafe 3 Cable or USB-C charge cable
  • 96W USB-C Power Adapter + USB-C to MagSafe 3 Cable or USB-C charge cable

As far as DFU - You need a second Mac system to connect between which is also a USB-C based system and connect between them via USB-Cable as explained here How to revive or restore Mac firmware. I don't see that helping you if you got the Red battery Icon on the display. It's possible the battery may need a bit of charge using a bench power supply to give it a boost, but I would first give it the time to charge first.

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Do I need to charge it with the original MagSafe that came with the A2442 in the box? Or do I need to use a USB-C to USB-C to charge it? I've tried charging it already for a good 1.5 hrs with no luck nor activity on the MagSafe connector (not showing green nor orange).

If I leave it connected overnight, it will get some charge at least for it to power back on? As of now nothing has worked.

I tried connecting it yesterday to another laptop using Apple configurator (the working one was an Macbook Air), but the dead one was not being even reconized when connected (I was using USB-C to USB-C iPhone cable).

さんによる

@estebanbrenes - Either a MagSafe power cable or a USB-C power cable will work.

The power cable is the thinner cable Vs the full data cable. So that can explain why DFU wasn't working.

As for Apple Configurator thats not useful here. It's designed to manage a school or business collection of systems so they are setup the same way. That won't do anything here as your Battery is dead.

So plug the system in with your charger over night let's see what happens then. If that failed, then you'll need to find a local Mac shop with a bench power supply to trickle charge the battery directly with just enough power so the onboard BMC logic on the battery has power enough to then turn on properly to charge. Or this might require a new battery altogether.

さんによる

Its been around 6 hrs since I connected my A2442 to power. Magsafe is not showing anything yet. Should I try opening the MBP or trying to power it?

Do I need to wait more time, or connect it using the USB C I mentioned before?

さんによる

@estebanbrenes - Are you saying the Green LED on the MagSafe is not lit? If that's the case you'll need to use one of the USB-C ports. Take note which one and again give the system some time, if that fails try the other port.

さんによる

Magsafe is not showing any Led, it is not lit at all. Tried the right one for 2 hrs with no luck. This is the second time the laptop has its battery flat 0%. On that first time we had this problem we went to a authorized repair center and they fixed it - the clerk said they connected it to a "server" and downloaded something which fixed the battery issue... But they didn't tell us that it might occur again nor what exactly they did to fix it.

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Esteban Brenes さん、ありがとうございました！
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