The clicking sound of a drive isn't from the controller card in the drive but the mechanical arm that holds the read/write heads. Once that is worn is slaps up against the main spindle for the platters. Replacing the card would be a total waste of effort unless it was only a fault with that.
Attempting any other repairs yourself will most likely damage the drive even further where any data retrieval won't even be possible by a professional service. One reference on drive faults can be seen at Common hard drive faults
A second reference on drive clicking is a good read at Problem with hard drive clicking - ThinkWiki
The next reference is a real oldie that advised booting from a live Linux distro if you don't have a program like Undelete to use in order to rescue files and data from a nearly extinct drive. This was written while Knoppix was still only a small live cd not the much larger live dvd as it is presently. http://www.shockfamily.net/cedric/knoppix/
With the drive installed internally temporarily you would boot live from ubuntu or Linux Mint to view and copy files from the drive over to another before simply dumping it as long as the drive remains readable. This would one option if any one of a number of data recovery programs fail to do the job for you.
If it was simply a controller card and bought within the last 3yrs. you would have the limited WD warranty to save a little on cost not including shipping over bringing it into a data recovery service while it might just take that if nothing else works.