MacBook Pro a1502 The keyboard does not work, trackpad works perfectly
I've been asked to try to troubleshoot/repair a Macbook Pro 13" Retina (Early 2015). The keyboard does not work on the thing (except power on/off button) the power on/off button works perfectly besides that when i shutdown the device and try SMS it also works on my internal keyboard, the trackpad mouse does work as well. If I plug in a USB keyboard, that works. I bought and replaced a keyboard ribbon cable as that seems to be the most common issue causing this symptom, but it has not helped. I'm really not all that familiar at all with Macbook repair. I tried to connect external usb keyboard . and do SMC and PRAM reset but nothing has changed.
Anyone else have any ideas? I just hate to spend money on parts that may or may not fix the issue.