If you can still access the drive use something like unstoppable copier
http://www.roadkil.net/program.php?ProgramID=29
Normal copy commands will fail when they hit the first damaged file, unstoppable copier keeps going, skipping the few files with damage.
If you can't access the drive try R-Studio, if that still doesn't see it run Spinrite on the drive first then try R-Studio again. If still nothing you can get into advanced stuff like using linux forensics tools but that's a bit beyond the scope of this thread.
If you think it's an electronics problem swapping the circuit board works but that's RARELY the problem. Mechanical parts fail way more frequently than electrical. Also freezer trick is LAST RESORT and doing so gives you only a one shot window before condensation forms on the platters and the thing is dead for good. Not recommended for newbies to hard drive recovery.