Built-in keyboard not functioning but the trackpad is
The built-in keyboard on my 15” mid-2015 MacBook Pro is not functioning— the trackpad is working without a problem. I’ve tried replacing the trackpad flex ribbon cable between the logic board and the I/O controller. No luck.
I don’t see any apparent damage and a wired or Bluetooth keyboard works just fine. Any help would be extremely appreciated.
Part that I tried replacing: Touchpad Trackpad Flex Ribbon Cable Compatible for MacBook Pro Retina 15" A1398
- APN: 923-00541
- PPN: 821-2652-05, 821-2652-A
Well the connector and cable look fine so I went ahead and disassembled the logic board. When I flipped the logic board over, the backside of the keyboard connector socket seems to have some corrosion and maybe even a blown capacitor (or whatever that is). Take a look at the right side of the first two images below.