Won't Power On - Logic Board?
My late 2010 Macbook Air has liquid damage. For about a year it worked fine, then it stopped working. I took it to the Apple store and they replaced the I/O board. A few months after that, it stopped working again. If I plug in the power adapter, the LED doesn't light up.
I took it too the Apple store, and they said they couldn't get it to power on directly from the logic board, and they said it was a possible logic board issue.
I have a new Air, but I want to fix this one. I have a sneaking suspicion that the Apple store didn't fully diagnose the issue. The fact that I see no power going to the battery through the IO board (LED not lighting) makes me think it might be the I/O board they replaced which is not working properly. I have no idea how the power flows through the laptop however, and I'm aware it could be any piece in the chain. I've taken the whole thing apart and I don't see corrosion, and the only evidence of a spill is near the I/O board and behind the fan, (when I pull it out). The logic board looks clean.
Does anyone know how I can diagnose if the issue is the logic board or the I/O board, or even the Keyboard or Battery? I can purchase both the IO board and Logic Board and test, but it seems an expensive proposition.
Is this a good question?