Mid 2009 Model A1278 / 2.26 or 2.53 GHz Core 2 Duo processor EMC 2326

786 Questions View all

Computer turns self on, never shutting off?

Hot on the tail of my LCD fix: Why does my LCD screen wash out without a torque applied?

I've got a new issue to grapple with--I can push the power button to turn on my Macbook, but when I put it to sleep it will turn itself back on, and when I set it to shut down it will power and boot right back up on its own.

To rule out the button/cable being bad, I disconnected the keyboard ribbon from the ZIF socket, confirmed that pressing any buttons would not turn on the computer (to verify that the keyboard was disconnected), and then powered it up by shorting the contacts on the logic board. The computer booted fine and I shut it down, only to be met with it booting itself again.

The final test was to dis-/re-connect the battery and short the contacts again to make the computer boot, and then to short the pads for five seconds to force a shutdown. Again, the computer started itself back up again.

I've cleared the NVRAM and PRAM, reseated every cable on the logic board, and did a nose test for burny bits.

Suggestions? Tips? This one's got me stumped...

Answered! View the answer I have this problem too

Is this a good question?

Score 1

Comments:

I can kill it dead by holding the power button down for five seconds, so this may be a software issue (?)... interesting.

by

System log is showing "Wake reason: ?" LOL... still digging.

by

MacBook Pro 13" Unibody Mid 2009 AirPort Card Replacement - Step 22 & 23, this is what I'm referring to.

by

LikeARabbit, it's interesting you say that as my wireless hardware is reporting as not installed. Bummer about the logic board damage...

by

Ugh, I was kind of hoping you'd say that wasn't the case. Still I would try to flip the connector around, you may get lucky. Apple REALLY should have made connection irreversible. I've seen dozens of failed reassemblies as a result of this. I was an Apple Genius when this model was released and there were initially no warnings about the grounding tabs. I remember another member of our team finally figured out what was causing the problem and a few months later Apple updated the manual & started including paperwork about this detail with new display clamshells.

by

Show 2 more comments

Add a comment

1 Answer

Chosen Solution

Did you ever remove or disconnect the Airport card during the LCD repair? My memory is a bit foggy on this but this sounds like a symptom we used to see when the cable inserted into the Airport card upside down. Immediately after shutting the Mac down it would power back on. One side of the cable's connection should have two small grounding tabs (like two small C's cut out), if these are visible and facing outward then this is likely the cause. Unfortunately I seem to recall irreversible damage being done to the logic board if this situation arose.

Was this answer helpful?

Score 0
Add a comment

Add your answer

Philip will be eternally grateful.
View Statistics:

Past 24 Hours: 1

Past 7 Days: 7

Past 30 Days: 26

All Time: 950