Chosen Solution
So yesterday I successfully changed my Macbook Pro Early 2015 trackpad. All the parts were put on right places and nothing left wrong. After I turned on my Mac everything was working perfectly including my new trackpad. But! Then I found out that my Function keys don’t work properly. When I press them they do work correctly, but they don’t do the stock commands like turning the volume up, down, brightness, next song etc … Instead my volume button takes me to the dashboard with a whole new commands for these buttons. I have been into the whole keyboard options and have done almost everything like ticking off the mission control settings. Unchecking the F1, F2 as standard keys etc. Everything like this is done. Still! I can’t manage to get the factory commands back. I really don’t know how this happened. I have tried PRAM and these kind of things without any luck. Notice that all the keys do work and nothing is damaged on the hardware, because when I press them they do work but in other ways. I didnt have this problem before the repair. It is difficult to believe that the repair may have caused this because all the buttons do work properly, but does other things. Update (01/11/2017)
Here is a SS of the USB settings.
If unchecking Function keys nor SMC and PRAM reset don’t work, it can be a Key-remapping issue related with a hardware security mechanism against malware (as explained in the last post in https://discussions.apple.com/thread/654...). Apple uses in store a non-accesible software tool. For me, the solution was just installing and opening this program: https://github.com/tekezo/Karabiner-Elem…. Solution taken from https://apple.stackexchange.com/question….
Have you tried deleting and reloading the ‘Input Source’ keyboard? I would recommend setting up a second keyboard first (USB or Bluetooth) just to be safe here! Go into the Keyboard Prefs setting window and click on the Righthand menu choice ‘Input Source’ now hi light from the left column the keyboards flag (in my case a US flag) using the minus key at the bottom, then close the window and restart the system, then reopen to add it back in. Did that solve it? We will need to know what are your keyboard resources are. Go into ‘About This Mac’ Click on System Report. Now in the left column expand Hardware section and then click on the USB. Now in the Right column grab the cross bar and slide it up so the Keyboard & Trackpad resources are all visible. Take a screenshot of the window and paste it here for us to see. Also tell us what your OS is and what is your keyboards language (US, British, French …) Update (01/11/2017) Well, I think you have a bad keyboard here. I assume the reason you replaced the trackpad was do to a liquid spill of some sort. Sadly, what ever spilled also effected the keyboard. I would visit an Apple Store and see what they have to say is the issue. Once they report back to you on whats wrong you can decide if you want them to fix it or give it a try your self.
The trackpad was probably damaged by a bulging battery pushing and breaking the trackpad due to poor design. I’ve experienced this on two MBP and am pretty fed up with it since the battery and whatever damage it makes isn’t covered by warranty and Apple doesn’t take responsibility for faulty design. Two days ago after connecting to my Apple TB monitor at home with and Apple USB keyboard (and BT trackpad) connected I experienced the same malfunction of the volume keys as stated above in one of our families MBA and I’m pretty sure it’s due to really unstable OSX nowadays. Has it really been that long since the late S.J. went 6ft under? Hardware and software that used to be “it just works” -which lead me to replace my families entire eco system several years ago and contiously adding new Apple products- seem to be dropping like flies and is nowhere near anymore. Volume /function button problem: [Fn] button working since double press opens the “dictation” pop-up and all F1-12 work correct wile the default functions like brightness and volume are gone. I’ve tried activating and deactivating “Use F1, F2…” and also disabled “Show desktop/dashboard” for [F11] and [F12] while the latter two were never activated by myself. On the external USB Apple keyboard everything works correct. So, no keyboard hardware failure but instead I’m confident a full clean install will do the job like in the days of crappy Windows unless someone can come up with a solution to restore functionality which wasn’t altered by myself…
I went into system preferences, keyboard, and saw that somehow “use F1 F2 keys as standard function keys’ once i unclicked that it all worked fine
Go to Settings>Keyboard>Keyboard>Deselect the lower of the two boxes, as seen in the attached picture. Enjoy!
