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. 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. I'll try an SMC bypass and see if that does anything at all and update on this. I did an SMC and PRAM reset, though it's unclear if it did anything at all. The battery indicator shows a 100% charge, as does Coconut Battery, which should mean that it's not the SMC. 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. I just pinned it down to magnets or magic. MacBook models introduced in 2006 through mid 2009. 60W MagSafe Power Adapter with 'T' style connector. MacBook models introduced in late 2009 through 2010. 60W MagSafe Power Adapter with 'L' style connector. MacBook models introduced in 2015 or later. I've had this problem before, which went away after a short while by itself. Apple 29W or 30W USB-C Power Adapter and USB-C Charge Cable. 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.
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