Totally Unresponsive - SMC Dead?
MD322LL/A (Late 2011 MBP 8,2) running El Cap.
Was using it in the Anchorage airport. Went outside to smoke. Came back in. Laptop had turned itself off while we were outside, which seemed odd but whatever.
Used it for a few more hours, then traveled from the one airport to another, which entailed two heated bus rides along with maybe a total of an hour outside.
Got to the other airport and the thing was totally dead. It won't boot, there's no pulsing status indicator light, it won't report battery level (which was full when I left the airport) via the little button on the side, and the light on the magsafe won't turn on when attached. I've never seen a laptop so dead.
I'm thinking the temperature back-and-forth in Anchorage thrashed something, and given that the SMC controls the power button, SIL, battery management, and battery indicator light, it is my prime suspect.
I read somewhere (damned if I can find it again, though) that the SMC is powered by a battery on the logic board. And I know that cold is rough on batteries. My hope is that it's a common button cell that can be easily replaced. But I could be on the totally wrong track here.
Is there any hope of repairing this, or is it new logic board i.e. new mac time?
Edit: FWIW, I've tried SMC reset via the standard procedure for macbooks with "non-removable" batteries (shift-ctrl-option-power, as well as the older procedure (power button for 10 sec) by opening up the bottom and disconnecting the battery. No effect. Also went through the motions of a PRAM reset, just for kicks. No change.
Magsafe charger is known to be good. Main battery status is unknown, but I'd think that it could boot via magsafe power regardless.
Update: I tried disconnecting the battery, then booting on magsafe power, to check if a faulty battery was interrupting the power circuit or whatever. No change.
Tried bypassing the power button by shorting the solder pads, both with keyboard attached and detached. No change.
좋은 질문입니까?
댓글 4개
@mayer might be able to help.
Aiden 의
Check the MagSafe connector on the computer for debris. Often a simple cleaning can do wonders here.
Steve 의
Surely a dirty magsafe would not prevent it from booting off of a battery I know to be full...
But yes, I clean the magsafe regularly. That is not the problem.
Joshua Vande Walle 의
I have the same MacBook Pro 15 late 2011. It did the same last week. No light on MagSafe, so I used another, which lighted for a day. I had a problem with starting the computer. The day after, the fan was full speed. On the Mac Fan app, it was written: no data from the sensor. I reset the SMC a few times, first, it was successful. Another day, I unplug for a while the battery, and then the Mac Safe that I replugged, glows green a little bit. So, I let it charging and the computer starts by itself after a few minutes but the battery was not plugged or discharged.
The battery had more than 1000 cycles. When I tried it on the other MacBook, It started the computer by itself just when i plugged it, the other battery didn't. When I had performed a clean up I had noticed this curious behavior a week ago. The faulty Mac's battery charged on the second computer and could run its without a charger.
It seemed to me it is SMC related.
jeangould 의