MacBook turns off when charger is disconnected
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.
crwdns2894050:0crwdne2894050:0
This "chosen solution" for this question didn't work for me, but this one from CNET did. All I had to do was reset the PRAM and keep the buttons held down until I heard THREE OR MORE startup chimes. Problem resolved completely.
_____________________________________
MacBook Pros suddenly shutting down when disconnected from power adapter; not running from battery -- more fixes
BY
CNET STAFF
SEPTEMBER 2, 2009 7:10 AM PDT
https://www.cnet.com/news/macbook-pros-s...
An in-house MacBook Pro recently began exhibiting this issue, and the fix that eventually worked was resetting the PRAM with a twist. Apple indicates that resetting the MacBook Pro's PRAM requires holding down the Command, Option, P and R keys at startup until two restarts occur. However, we found that waiting for three or more startup chimes while resetting PRAM resolved this issue where waiting for only two chimes did not.
crwdns2893770:0crwdnd2893770:0 Robert crwdne2893770:0
Same problem, but the three chimes didn't work for me. The battery stays charged and symbol at top shows 100%, but computer is still saying the battery needs replacing, rates it as poor. Shuts down as soon as power cord removed. Coconut says it's 99.4% with 1 cycle. Any suggestions appreciated.
crwdns2893770:0crwdnd2893770:0 sue crwdne2893770:0
Tried 5 chimes and the battery warning "Replace Now" did not show up, info looked normal. All seemed well until I took off the magsafe. Computer went off and when back on the warning showed up again.
crwdns2893770:0crwdnd2893770:0 sue crwdne2893770:0
`It may be that you have to use CNET's solution AND replace the Magsafe adapter.
I've had zero problems with this issue since posting that message and resolving it with CNET's solution, UNTIL I was away this past weekend and threw the old Magsafe in my bag and left the newer one I usually use. The issue returned (MacBook Pro goes dead when Magsafe adapter removed and needs to be rebooted).
But when I got back home and used the newer Magsafe adapter I usually use, no more issue, and didn't have to do the CNET solution all over again.
I DID have to do the CNET solution with the newer Magsafe adapter initially and have not had a problem since, so the solution (for me) was:
1. Replace the Magsafe adapter.
2. Use CNET's solution as outlined above.
Running fine.
crwdns2893770:0crwdnd2893770:0 Robert crwdne2893770:0
Thanks...will try a new adapter. Do you know why it would make a difference, although doesn't matter as long as it works. With the one I'm using, the icon does show 100% with no warning after the CNET solution...until I unplug. It did take overnight to charge the battery the first time which seems long..
crwdns2893770:0crwdnd2893770:0 sue crwdne2893770:0
crwdns2893776:07crwdne2893776:0