Thank you for your replies, and sorry the situation is hard to explain in English.
I mean i have opened the patient, but the most important data is on the donor.
And yes, i don't understand why the exchange of PCB has damage the donor...it never happended to me before.
I take this as, you found a donor, and that donor also had important data. You assumed changing the PCB would not kill the donors PCB, and now your important HDD that you were using as a donor is now ALSO dead.
1) Always back up.
2) if you are going to use a drive with data as a donor, clone that drive and forget it ever existed for the purpose of storing data after you use its parts for ANYTHING.
3) at this point it is really going to need to go to a pro, because you have 2 dead pcbs, and likely a dead preamp (hypothesis) on the "patient" drive.
What is going to have to be done is the donors board will need to be checked, if it has an EEPROM on U12 position, you are somewhat in luck, you can desolder this, and transfer it to a new matching board. This *should* fix your donor.
Next, to fix the original problem drive. It HAS to go to a cleanroom, it will likely need to have the original heads removed, the platter/s will now need to be cleaned (contamination) and then a new set of heads is going to need to be installed and "tuned".
Then it will need to be imaged and monitored carefully; because of the contamination there may be a need for even more then one set of heads.
I apologize if I sound "mean", but I am just giving you my honest professional opinion of this case so that you understand what you are up against.