"What do I do to the PCB?"
What?? You don't do anything with the circuit board in the case (PCB - Printed Circuit Board).. It was most likely damaged in the fall.
I think there is a bit of language barrier so far in this thread. You have been told MULTIPLE times to open up the case and take the drive out and connect it to your PC directly.. I don't know how else to explain this too you. I would suggest you have a friend that understands english better read this thread and translate for you.
I am sorry for understanding after a lot of time...I don't know much about the hard drive technologies . I'll ask a technician to connect it to the CPU. I'll ask later if I have any query.