Thanks for the guide. Once you open the device it’s kind of self explanatory but I was glad to find this tutorial to know that the replacement was possible. In my case, my power board was fried (and I mean, fried. The fuse blew in the house with an awful smell coming from the ATV. When I opened it the inside of the power board was a black mess). I didn’t see the link with the airport card but I guess this was steps for another tutorial.
Joshua, sorry to say that, but do you really think anybody in his right mind would attempt to remove the adapter casing before unplugging the adapter? Is such a thing even possible? You gotta give people some credit. I doubt such morons even exist. If they do, maybe it's best they don't reproduce. Darwin Awards, you know?
I'm attempting to do the repair as well. Just to say, I had two adapters I wanted to repair, one was a 85W: almost impossible to open. It took ages. I cut it with the knife, all around, then took some pliers to it to force it open, I ended up cracking the case. All that before realizing my soldering iron was toast. I was planning on borrowing one so I didn't give up. I took the other adapter, a 45W, this time, no knife, I went directly with the pliers, it opened directly, no damage. I think there are a lot of different versions of the adapters. Depending on the one you get, you might be lucky.
Both of mine, I need to unsolder to open any further. I'll come back with more news.
FIY, I know the question has been asked two years ago, but I've been struggling to find a straight answer, so I thought I'd post it here for others to find it more easily, it's not a macbook air 2012 SSD, it's a macbook air 2013 SSD. Ref : SDNEP 655-1837D or SDNEP 655-1837C. It's a 12+16 pin. You can find it on ebay and similar models, and also the list of apple computers using them (quite a lot, actually, it's not at all limited to the macbook air 2013). I just installed one in mine (like half an hour ago. System is currently downloading on it).