It can probably be repaired, but it depends what tools you have available for diagnosis and repair.

If you have a multimeter, first thing I would do is check the pins of the keyboard port on the motherboard to see what signals you are getting. As well as testing to see if anything is potentially shorted (other than the ground pun). I would also test continuity from the pins to the board to make sure there are no cracked solder joints.

Keyboard ports are often protected by fuses, so it's possible that if something was wired incorrectly (i.e. shorted) that it blew that fuse. Replacing these usually requires desoldering and resoldering a new one.

Of course, there could be some other issue at work, which is why testing and diagnosing things first is important.

I'm really hoping it was a fuse, but I can't find schematics for the motherboard, to even know if it's fused, and which fuse it would be. I've never replaced one of those little face mounted fuses before.