I have replaced the logic board, now the I/O board, and yet the issue still remains. So it is something inside the display assembly that is causing this issue. This is extremely unfortunate, since that’s the most expensive component to replace, there are few pre-owned eBay models w/o screen damage (if trying to scavenge from the “parts only” as-is category), and its also the most difficult piece to work on. Unless I can find a good A1466 13” screen assembly to drop-in, it looks like I may be in the market for another Mac Air. I am not confident that dismantling and trying to debug the actual board will be fruitful. If I buy another Air, it will probably be a used A1465 (11”) from Mid 2012 to 2015—the specs are virtually unchanged from the new Mac Airs, the new OS (Mojave) is supported, and you can get for $1000 less!
Here’s an update— I have completely replaced the logic board on the Mid-2012 Macbook Air and the issue has not gone away. This implies that the issue is related to another component. So is it the display or the I/O board? At first glance, it seems that the display is at fault, because you don’t get a picture after you press the startup button, despite the fact that you hear a chime. However, the fact is that when I put the computer to sleep while it is warm, then the computer will not wake correctly, and also is incapable of restarting. This wonky behavior leads me to believe that a software check is involved—e.g. probably not a result of a faulty component in the display itself. So I am looking at the I/O board as the root of the issue, either because a temperature sensor or discrete component such as capacitor or resistor has some poor connection, or has fallen out of spec. The search continues!
Exact same problem happened, after water spilled onto the computer. I've done this before, regrettably, and I ended up replacing the keyboard. This time, it's the network card or something. After the computer dried up, all of the following services were gone: bluetooth, wireless, ethernet. Surprisingly, in the "about this mac" section, the hardware and addresses were still known by the computer, but none of these functions are working. I will do some research and figure out what needs to be replaced. I am hoping it is just an "airport" or COMM board, and not a complete motherboard, etc. To be continued... <POST UPDATE> I have learned enough to say that if you've lost the network capability (wifi + bluetooth) then water probably reached the logic board. I opened up my 13" Air and I could see corrosion and pock marks on probably more than a dozen components. Inevitably these parts were shorted out at some time. What is surprising is that the laptop even turns on, at all! So in this case, I think there are...
I replaced screen + battery at the same time (using ifixit replacement battery and display assembly). All went well, pretty easy to do, and the new display looks great. However, my battery appears to be stuck at 50%. I suppose I can pop loose and then try to re-seat the connector. Probably won't help. Has anyone else experienced this issue? Any hints/ideas on how to fix it? Thx
If your microphone isn't working , check to see that the double stick tape is not blocking its input. Obviously the microphone needs airflow to get it to respond to anything, and as it came from ifixit, the adhesive tape was not perforated, so no "signal" was reaching the microphone. Consequently nobody could hear me on the phone. Since the iPhone already has the microphone brace, I just removed the double stick tape that was included on the back of the new microphone, made sure the microphone was centered on its rubber housing and post, then pressed the brace tightly against the microphone with tweezers while I screwed it down. I had called myself using google voice to aid in troubleshooting the microphone, and that horrible echo feedback (aka alien-whale-sex noise) you get when you put the phone up the computer's speakers signalled that the microphone was now picking up its surroundings. Hooray! Despite my minor difficulties, I'm still blown away with the stuff you can get from Ifixit. Thanks! DW
Very cool! Hopefully I will never buy one, so I will never need to fix it ;)
I replaced screen + battery at the same time (using ifixit replacement battery and display assembly). All went well, pretty easy to do, and the new display looks great. However, my battery appears to be stuck at 50%. I suppose I can pop loose and then try to re-seat the connector. Probably won't help. Has anyone else experienced this issue? Any hints/ideas on how to fix it? Thx
If your microphone isn't working , check to see that the double stick tape is not blocking its input. Obviously the microphone needs airflow to get it to respond to anything, and as it came from ifixit, the adhesive tape was not perforated, so no "signal" was reaching the microphone. Consequently nobody could hear me on the phone. Since the iPhone already has the microphone brace, I just removed the double stick tape that was included on the back of the new microphone, made sure the microphone was centered on its rubber housing and post, then pressed the brace tightly against the microphone with tweezers while I screwed it down. I had called myself using google voice to aid in troubleshooting the microphone, and that horrible echo feedback (aka alien-whale-sex noise) you get when you put the phone up the computer's speakers signalled that the microphone was now picking up its surroundings. Hooray! Despite my minor difficulties, I'm still blown away with the stuff you can get from Ifixit. Thanks! DW