Chosen Solution
Got a 15" MacBook Pro A1398 (Mid 2012) from my brother because the WiFi doesn’t work (icon doesn´t even pop up). Changed the AirPort card but nothing helped. Could it be the antenna cable?
This is a scren dump showing you info from Network and as you can see there is no WiFi icon at the top right. /holger Update (10/11/2017) I got this which clearly says it´s for A1398
I got it from Aliexpress however for 12$ so I guess it could be that… /holger
Where did you get the part from? You either have the wrong part or the logic board its self is damaged. Here is what the correct part looks like: MacBook Pro 13" and 15" Retina (Late 2012/Early 2013) Airport/Bluetooth Board Apple P/N’s 661-6534 or 661-7013 The system info panel is not even showing the cards info which would be the heading ‘Interfaces:’ just below the ‘Software Versions:’ heading. Which tells me the card is physically not being seen. While you also might have antenna issues as well, we still need to get the card visible here first.
