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모델 A1278, 2012년 6월 출시. Turbo Boost가있는 Intel 프로세서, 최대 512 MB DDR5 비디오 RAM

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Diagnosing problem after fall

My MacBook fell about 2ft and landed upside down. I immediately checked it, turning it on, pulled up safari, made sure keyboard worked,and everything seemed to work fine, however the next day it would no longer turn on. I tried doing an SMC restart and nothing, I opened the back and disconnected and re connected the battery, and still nothing. The charge cord light turns green when I press the power button, but then goes to red shortly after I release the button. What damage should I look for when opening the Mac?

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You'll need to get a new battery to even test your system. Or find someone with the same model which you can charge your battery off of.

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I found another battery from a friend. It is fully charged but still no response when I press the power button. Any other thoughts? Thanks

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Thats not good ;-{

At this point you have a logic board issue. It might be repairable as the shock of the fall dislodged some components. This will need someone with deeper skills and access to the needed tools and parts.

The other direction is just replace the logic board.

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This may been a power issue. The fall might have damaged the DC-IN board/connection. Battery could be dead. Unit may not be getting power.

Try another known-good AC adapter and see if it will then boot. (it should boot up even without a battery in/connected).

If no boot then, you have to see if you can get another charged battery to test the main board. Unless you test as described above, you will not know if it is just a power issue.

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Unibody systems need the battery to boot its the retina models you can cheat.

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Hmmm?? ....just now working on a 2013 Retina 15" MBPro. Boots fine with no battery. Had to remove the battery due to major swelling.

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As I said the retina models will work off of the MagSafe alone if you reset the SMC (disconnect the MagSafe and battery, press the power button for a minute, then plug in the MagSafe) the system should spontaneously start.

The older non-retina unibody system need the battery with some charge.

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