Seagate hard disk problem

sir i have ST3500418AS S/N.:6VMGT1YP P/N.9SL142-302 Firmware:CC38 Data Code:11015 Site Code:SU Its not working. I Replaced another hdd`s pcb S/N:5VM27HB6 P/N:9SL142-300 Firmware:CC34 Data Code:09486 Site Code:WU. Using that board hard disk running. but in bios it comes 0Mb. I want my data back. can You help me sir?
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  1. You will need to transfer the 8-pin serial flash memory chip from patient to donor:

    This chip stores unique, drive specific "adaptive" information. Some board suppliers include a firmware transfer or ROM transfer service for US$10 - $20. Otherwise, if you are not adept at soldering, your local TV/AV repair shop should be able to do it for you.

    BTW, what is wrong with your original board? Does it still spin up the drive, or does it have a fault similar to the following:
  2. I have a similiar problem to [...] uctors.jpg
    The left two of 3 chip capacitors that are squered in the picture have burned out. I have replaced the PCB with another one that has come out of a 250GB drive, now the Drive spins and I can hear what looks like it is trying to read but after a few seconds it just continues to spin while the drivers cannot be loaded and the PC does not detect the device.
    I'm trying to save this friend's of mine the wedding photos and his child photos.

    Any ideas, I would really appreciate.

  3. In your case there will be a 5V TVS diode that has shorted due to an overvoltage on the 5V supply. You will need to remove or replace this diode.

    Do you have a multimeter?

    Could we see a photo of the board?
  4. First of all, let me thank you for your quick reply, I was not expecting it so quick.

    I do not have a multimeter handy now but I can get one, I have a couple of pictures of the PCB I can share with you:

    Thank you once again.

  5. The 5V TVS diode is probably shorted. I'd also check your 12V diode.

    After removing the shorted diode(s), I would test for continuity between each pad on the PCB and the respective ground and power pins at the SATA power connector.

    Here is a cheap multimeter:

    Cen-Tech 90899 7 Function Digital Multimeter (US$5):

    Cen-Tech 90899 7 Function Digital Multimeter User Manual:

    If you cannot repair your board, then you will need to transfer the EEPROM, or its contents, to a replacement PCB.
  6. Hi again

    I tried with a miltimeter yesterday but I didn't have any idea what I was trying to measure, I cleaned the PCB up and you can clearly see that the burned out component has punched in a whone in the PCB and maybe opening up any possible trucks. So I decided I'm not even going through trying to repair the damaged PCB having to go through all the trouble of trying to get schematic diagrams, component list and values, trying to order them etc.
    I took your advise of desoldering the eprom IC from the damaged PCB and placed it on the brand new PCB I had from another Seagate but 250GB and it worked just fine. As I'm writting this reply, I'm actually copying stuff over to another HDD.

    Thank you very much for your time and effort, thank you for your suggestions.

    Best Regards
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