F key on keyboard no longer working after cleaning

I have a blackwidow v2 keyboard and everything on the keyboard works fine. 
but after cleaning it the F key no longer works. I have tried plugging it into different usbs, getting out of synapse, etc. I think after cleaning it, something inside makes the key no longer work.

I need a repair guy to have a look at and fix the keyboard rather than buy a whole new one.
is there anyone who can help? razer says the serial number is out of warranty.