Keyboard not working. But Trackpad and Power button does.

Water was spilled on the machine.

I ran the 'Apple Diagnostics', it told me 'No issues found'.

Anyone has any clue ?

updated:

external usb keyboard works fine. I tried shutting down my mac, and then press the internal keyboard's 'shift-control-option' + power button (reset SMC), it didn't boot.

i turn on the mac, and immediately press internal keyboard's 'shift-control-option' + power, it shut down.

i turn on the mac, and immediately press internal keyboard's 'option+command+P+R', nothing happened.

i turn on the mac, and immediately press external keyboard's 'option+command+P+R', it restarted.

but after all, the keyboard still doesn't work.