Except replace the dead control board with fully functional identical control board.
Easier said than done.
There's equipment that can directly read the magnetic patterns directly off the platters to restore the data.
Is there? I've been told over and over again, that this is the work of fantasy TV by many of my professors.
Yea... because the control board is where the data is saved ?
Huh? When did I say that? The control board controls the hard drive, and the various motors. Unless you have the EXACT control board for that exact hard drive, you'll never power that hard drive again.