If your old PCB doesn't spin up the drive, check its TVS diodes.
Here are the diodes from another Samsung model:http://www.users.on.net/
If the diodes are OK, then measure the following voltages:http://www.users.on.net/
If the voltages are OK, then we can obtain a diagnostic report from the drive's serial port. Let me know if you get this far.http://www.alexsoft.org/viewtopic.php?f=19&t=643