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The larger of Apple's MacBook Air laptops featuring dual microphones and 802.11ac Wi-Fi connectivity.

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Battery dead after liquid spill, Battery replaced still no good

Hello all,

I am trying to get my MacBook Air working again after it suffered a Coke spill which destroyed both the battery and display connector. It still boots and function correctly via external display but showed the battery as completely dead (replace now & not charging). So I purchased a new battery and fitted it today and it started, showed as normal and charging... Woopee! so i waited till 100% and unplugged the cord, at which point it died. There is no power at all when the cord is unplugged.

Below is a picture of the area around the power socket, I'm not sure if my backlit keyboard isn't working either, but I'm hardly bothered as at the moment its kind of dead.

Id much appreciate it if anyone could offer me assistance! thanks :-)

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Been advised that it could be related to the MagSafe I/O board as the MacBook starts on its own accord when plugged plugged in, with or without the screen open.

Has anyone any similar experience or can back this up before i spend money on another board?



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You may have only damaged the DC-in board… but it's impossible to diagnose without the board in the hand and a magnifier.

Did you clean the board? Both sides or only one? Did you/can you (using a magnifier and light) see any corrosion, or burned swollen components around the area of the Coke spill. As you probably know Coke is corrosive and if not cleaned off will continue to degrade your logic board.

If this answer is acceptable please remember to return and mark it.

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Puan 1


I've checked as far as I can see and the only component that was visibly damaged was the Display Connector. As there is little bits of orange corrosion on most terminals but as the computer seems to function normally I didn't think that seemed to matter apart from this other component that's dead.

On the battery terminals that plugs into the board, the first left 3 pins are orange but the rest are OK. The old battery had corroded around those 3 pins. How does the macbook receive information from the battery? Does it use all the pins?

I've cleaned the board with IPA wipes but can't see anything else that is immediately worrying. Where is this DC in board you speak of?

Thanks for your help :-)


Just had a quick thought, are you referencing the MagSafe DC board? I didn't think it's that as there hasn't been any sign of liquid on that side and it has charged the battery and the battery is showing everything it should. Just when it's unplugged the battery doesn't take over from the adapter


Little bits of corrosion means liquid (in this case corrosive Coke) was present so damage is possible your logic that little bits of corrosion don't matter is similar to thinking "I don't understand why my car won't start, I filled up the gas tank.". Burn marks swelling definitely confirms damaged components (all that stuff is potentially the source of your trouble). Corrosion can allow arcing and can change resistance. Computers work because a lot of sensitive electronic components play well together... it's not stone axes and bearskins.


Yes all the pins carry current, I was wondering about the state of the DC-in board and the other corrosion details are important... you could have a dead logic board. When you unplugged mains power the EFI may have determined the corroded battery terminal out of speck and stop current passing, the corrosion could have shorted out the connection to the new battery, or, the batteries on-board charging circuitry didn't like what it was detecting, stopping charging. There are many logic circuits working within/on the logic board that report to EFI (like Astronaut's "Mission Control") if all systems are not "go" then they could shut down completely to stop risk of fires ( Li-ion (LIB) batteries are very explosive when shorted... they also can get hot enough to start house fires if they don't explode)


I completely understand what you mean, maybe my use of 'corrosion' is a bit harsh, as it looks more of a light tarnishing. I've searched all over for anything that stands out as physical corrosion but nothing.

There is nothing showing on the battery info via system info, and I had hoped somthing would have been displayed on there if there was. I'm in the process of sourcing the schematic for the board but haven't found one as of yet.

I understand the fragility of computers and their components, I just hoped that I might have been overlooking a simple thing that might go for circuit protection.

Thanks for your help so far :-)


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