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Hi, Around two days ago I was about to move my workhorse to the kitchen, to do some culinary research (read: how to boil potatoes) when my MacBook just turned off when I disconnected the charger. I’ve had this problem before, which went away after a short while by itself. I just pinned it down to magnets or magic. After a while of being mildly annoyed by it shutting down, I began testing the battery in TechTool, which gave me virtually no information save for the fact that the battery is just maintaining its charge, but not actually getting any. The battery indicator shows a 100% charge, as does Coconut Battery, which should mean that it’s not the SMC. I did an SMC and PRAM reset, though it’s unclear if it did anything at all. I’ll try an SMC bypass and see if that does anything at all and update on this. Logic tells me that it’s the I/O board which is fooling around, but given my current financial situation, I don’t want it to be. So, bottom line, is there any way to be completely sure that it’s due to the I/O board, and/or any good way to fix it? Any help will be very appreciated and will hopefully help others in the future too. Update (11/23/2016) For the sake of clarity, I’ll enclose two Coconut Battery screenshots for future reference.
I bet you leave your system plugged in most of the time. What is happening here is SMC thinks the power level is below the set threshold so it needs to power down the system into deep sleep mode. So how to fix? It’s quite simple you need to do a SMC reset and cycle the battery a few times by fully discharging it and recharging it. That way the setpoint is memorized correctly. Here’s the Apple TN you’ll need to reference: Reset the System Management Controller (SMC) on your Mac The other method is disconnecting the Battery and pressing the Power button for 15 sec’s to fully discharge the logic board, then plug in the battery and MagSafe. The system should restart on its own. And lastly, check your battery! Install this gem of an app! CoconutBattery take a snapshot of the apps main window and post it here for us to see Adding images to an existing question
Hi, I might have a similar problem. My MacBook Pro shuts down suddenly sometimes when I move it and the charger gets disconnected. It doesn’t always happen, so I’m sure that it’s not a battery problem. It turned out it’s a problem with my charger. Perhaps it sends some surges of electricity or is otherwise unsafe that the MacBook decides to shut down. Anyway, the problem seemed to have disappeared when I got a new charger.
