How can I read the firmware number from a faulty HDD?

I have a Samsung HD503HI faulty hdd.
I buy a same working one.
How can I read the firmware number from the faulty hdd?
I would like to restore some data from faulty one, but If I change the pcb
the hdd is spin but the bios is not recognize.
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  1. Best answer
    Should be on it somewhere
  2. If your old PCB doesn't spin up the drive, check its TVS diodes.


    Here are the diodes from another Samsung model:

    If the diodes are OK, then measure the following voltages:

    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.
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