Why some keys not working on keyboard after battery repair?
After I installed the battery, the left shift and fn key do not work anymore and the caps lock light does not turn on.
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You should have whomever did the battery replacement open the computer up and check 2 things:
a) is the battery swollen or pressing hard on part of the hard drive
b) is the cable connected properly to the logic board, or is there damage to the keyboard's cable.
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I had a similar problem - I had my battery (& keyboard) replaced on my Macbook Pro 13” (2015). When I got it back, none of the function keys works (brightness, volume controls, etc.). Resetting PRAM/NVRAM, resetting SMC, unchecking the “Use F1, F2, etc. keys as standard function keys” in Keyboard preferences: none of these worked.
I read in another bboard a solution that worked for me: https://apple.stackexchange.com/question...
It’s a “Key-remapping issue” (I admit I don’t quite understand it fully). But download Karabiner https://karabiner-elements.pqrs.org/ – you’ll have to give it some permissions; open it up and simply quit out. Now your keys should be mapped correctly.
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