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Support and repair information for MacBook Air models with 13" displays

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Strange substance on motherboard

I have a MacBook Air 13" mid 2012. My colleague spilled some beer on my keyboard and the keyboard stopped working. The rest still does the job.

So I tore down my Mac and found out there was some rather strange residue on my motherboard. So I was wondering if this was just some glue from the assembling or this was caused by the beer (and by so, fluids) on electronic parts. If it's the latter, I'm afraid the motherboard had suffered some short circuit and by so in-repearable.

If you guys think it's just some glue or any other not harmful residue, I might consider replacing the top case by buying a new on eBay...

Your advice? Thanks

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That is basic copper carbonate, it tends to happen when copper, oxygen, soda water and electricity meet each other.

In other words, this is heavy corrosion. It might be still repairable, clean the board completely and test for fried/totaled components and replace them, see how if it's possible.

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Hi Tom,

Thanks for your quick reply! Two more questions though. How would you suggest cleaning the board? And are my chances in order to make this board working without replacing any parts (just cleaning)...



To be honest, you are lucky if the board can be repaired by replacing something. The damage is pretty extensive.


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You probably have dead thunderbolt/displayport but no one uses that anyway. Dip in alcohol and toothbrush it. 99% alcohol and a $1 baking tray from the corner store deli will do the trick. Let it sit in an oven after this for 225f(NOT CELCIUS) to get rid of all the alcohol. This is NOT to reflow solder, this is to ensure all the liquid evaporates.

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Thanks for your, rather unusual, tip. What's the goal of putting this in the over?! Won't it melt down all the components? It's about 100°C, right? It will for sure melt down the plastics, no?


um, real people don't have corner store deli's. Whenever you say that, I translate it to "Walmart" :(


It would be wise to listen to this guy, I really don't understand people anymore. they are trying to help you. Hes about the only person ive seen that knows how present information in a way anyone can understand. he wouldn't be losing much by not posting anymore of his advise.


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That's beerosion for sure.

You can put a lean cuisine in the oven at 225F and it doesn't melt the tray. Your board which was soldered at 600-700F will be fine. The point is just to evaporate the alcohol after cleaning.

You can skip the oven and just leave it out under a lamp for a day or so, or if you live in the Northeast like me, put it over the fireplace :)

Michelle, it is 100% definitely worth a shot to clean this up, you'd be surprised. My bet here is that this corrosion will clean right up. I don't see any of the characteristic black oxidized component ends that tell you the component is horribly damaged. Grab a toothbrush and get busy.

Post back with your after picture!

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michielkenis will be eternally grateful.
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