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macbook c2d mid 2007 shuts off immediatly after AC unplugged

by corbott / December 29, 2009 3:17 AM PST

Hi there,
I have a macbook mid 2007 that shuts down immediately after it is unplugged from AC. I've tried the battery on another machine and it works fine as well as trying a known good battery in this machine.Also I've tried a known good AC adapter. Other things I have done are run the hardware test which shows no errors, reset the smc and Pram, repaired permissions etc. the battery appears normal in the menu bar and says it is fully charged.Also it Appears in system information as normal.coconut battery also appears normal with 275 cycles.I'm hoping the problem lies in the Battery Connector with Sleep Switch and not the logic board. Anyone had any experience with this problem?

One other strange thing is that after unplugging the AC the system shuts down immediately, but once you plug it back in it starts without the power button being pressed.

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Doesn't sound strange at all.
by R. Proffitt Forum moderator / December 29, 2009 3:25 AM PST

Sadly I think you'll be replacing the logic board.

Hope it's under apple care.

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i think you are right
by corbott / December 30, 2009 4:58 AM PST

probably had something spilled on it.It's not my macbook so i'm not sure the history.Thanks for your help

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I hope its already fixed but
by rnauth1418 / January 5, 2010 4:31 AM PST

Both of those suggestions, while logical are not a completely good analysis of the problem. If it were a logic board issue the computer would act sporadically when interacting with the software or physical media. However, the computer shuts down ONLY when the ac adapter is unplugged. As such, the PMU (Power management Unit) is not functioning properly. There are two connection bridges to the battery, one that monitors the battery health, temp and charge and one that delivers power to the computer. As such, the first connection bridge is in place, the second is not operating at all.

Ultimately, the solution is the same. Take the computer to the apple store.

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