HDD GURU FORUMS :: View topic - Required PCB of seagate 500GB ST2500418AS

Your board has sustained an overvoltage on the +5V supply. The part on the lefthand edge of the PCB is the 5V TVS diode. You can snip it out with flush cutters.

The part near the SATA power connector is an inductor (or low ohm resistor ?). You can clean up the area with a toothbrush and isopropyl alcohol (tape head cleaner). Then replace the inductor with a wire link.

If there are no other problems, then the board should work perfectly well. However, be absolutely certain that your power supply is OK, as you will no longer have overvoltage protection on the 5V supply. For continued protection, you can replace the diode with an SMAJ5.0A from Farnell, Mouser, Digikey.

If you need to replace the board, then you will need to transplant the 8-pin serial EEPROM chip from patient to donor. This chip stores unique, drive specific calibration data. It is located in the top LH corner of the board.

If you need to purchase a PCB, try the following vendor:
http://www.onepcbsolution.com/

His price is US$40, plus $10 for a ROM transfer.

Alternatively, try http://www.hdd-parts.com/firmware-transfer.html

These URLs should help you identify the components:

http://hddscan.com/doc/HDD_from_inside.html
http://www.users.on.net/~fzabkar/HDD/HDD_ICs.txt
http://www.users.on.net/~fzabkar/HDD/TVS_diodes.txt

fzabkar wrote:

i did as you said but then came another problem the drive gets detected some times and disappears some time and when it appears it shows just about 7GB or something that too in recovery software
i think now there is a problem with the head is it like that ????

i have done as you said but there is another problem now you can check whether i have done that correctly
Now the hard drive spin for few second and stops and also makes some tick tick sound you can hear that in hdd.rar file
so can you tell me is it head or should i try with the PCB only

Author:	anudeep [ October 21st, 2010, 12:59 ]
Post subject:	Required PCB of seagate 500GB ST2500418AS
Details :: Seagate Barracuda 7200.12 ST3500418AS P/N:9SL142-300 Firmware:CC32 Data code:09305 Please let me know anyone has the above matching PCB.

Author:	networkpc3000 [ October 21st, 2010, 19:42 ]
Post subject:	Re: Required PCB of seagate 500GB ST2500418AS
hi, i have this PCB in stock. please contact me by email or MSN if need help. thanks.

Author:	fzabkar [ October 21st, 2010, 21:03 ]
Post subject:	Re: Required PCB of seagate 500GB ST2500418AS
Can you describe the failure symptom? If you upload a detailed photo, one of us may be able to help you repair your board, or at least confirm that the problem isn't elsewhere.

Author:	Eric Lee [ October 23rd, 2010, 7:08 ]
Post subject:	Re: Required PCB of seagate 500GB ST2500418AS
Hi, I have this working PCB in stock too, pls contact my hotmail to see if I can help or not. Thanks Eric

Author:	fzabkar [ October 23rd, 2010, 16:45 ]
Post subject:	Re: Required PCB of seagate 500GB ST2500418AS
Your board has sustained an overvoltage on the +5V supply. The part on the lefthand edge of the PCB is the 5V TVS diode. You can snip it out with flush cutters. The part near the SATA power connector is an inductor (or low ohm resistor ?). You can clean up the area with a toothbrush and isopropyl alcohol (tape head cleaner). Then replace the inductor with a wire link. If there are no other problems, then the board should work perfectly well. However, be absolutely certain that your power supply is OK, as you will no longer have overvoltage protection on the 5V supply. For continued protection, you can replace the diode with an SMAJ5.0A from Farnell, Mouser, Digikey. If you need to replace the board, then you will need to transplant the 8-pin serial EEPROM chip from patient to donor. This chip stores unique, drive specific calibration data. It is located in the top LH corner of the board. If you need to purchase a PCB, try the following vendor: http://www.onepcbsolution.com/ His price is US$40, plus $10 for a ROM transfer. Alternatively, try http://www.hdd-parts.com/firmware-transfer.html These URLs should help you identify the components: http://hddscan.com/doc/HDD_from_inside.html http://www.users.on.net/~fzabkar/HDD/HDD_ICs.txt http://www.users.on.net/~fzabkar/HDD/TVS_diodes.txt

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Required PCB of seagate 500GB ST2500418AS http://forum.hddguru.com/viewtopic.php?f=15&t=17413	Page 1 of 1

Author:	anudeep [ October 24th, 2010, 11:34 ]
Post subject:	Re: Required PCB of seagate 500GB ST2500418AS
fzabkar wrote: Your board has sustained an overvoltage on the +5V supply. The part on the lefthand edge of the PCB is the 5V TVS diode. You can snip it out with flush cutters. The part near the SATA power connector is an inductor (or low ohm resistor ?). You can clean up the area with a toothbrush and isopropyl alcohol (tape head cleaner). Then replace the inductor with a wire link. If there are no other problems, then the board should work perfectly well. However, be absolutely certain that your power supply is OK, as you will no longer have overvoltage protection on the 5V supply. For continued protection, you can replace the diode with an SMAJ5.0A from Farnell, Mouser, Digikey. If you need to replace the board, then you will need to transplant the 8-pin serial EEPROM chip from patient to donor. This chip stores unique, drive specific calibration data. It is located in the top LH corner of the board. If you need to purchase a PCB, try the following vendor: http://www.onepcbsolution.com/ His price is US$40, plus $10 for a ROM transfer. Alternatively, try http://www.hdd-parts.com/firmware-transfer.html These URLs should help you identify the components: http://hddscan.com/doc/HDD_from_inside.html http://www.users.on.net/~fzabkar/HDD/HDD_ICs.txt http://www.users.on.net/~fzabkar/HDD/TVS_diodes.txt i did as you said but then came another problem the drive gets detected some times and disappears some time and when it appears it shows just about 7GB or something that too in recovery software i think now there is a problem with the head is it like that ????

Author:	networkpc3000 [ October 24th, 2010, 20:43 ]
Post subject:	Re: Required PCB of seagate 500GB ST2500418AS
anudeep wrote: fzabkar wrote: Your board has sustained an overvoltage on the +5V supply. The part on the lefthand edge of the PCB is the 5V TVS diode. You can snip it out with flush cutters. The part near the SATA power connector is an inductor (or low ohm resistor ?). You can clean up the area with a toothbrush and isopropyl alcohol (tape head cleaner). Then replace the inductor with a wire link. If there are no other problems, then the board should work perfectly well. However, be absolutely certain that your power supply is OK, as you will no longer have overvoltage protection on the 5V supply. For continued protection, you can replace the diode with an SMAJ5.0A from Farnell, Mouser, Digikey. If you need to replace the board, then you will need to transplant the 8-pin serial EEPROM chip from patient to donor. This chip stores unique, drive specific calibration data. It is located in the top LH corner of the board. If you need to purchase a PCB, try the following vendor: http://www.onepcbsolution.com/ His price is US$40, plus $10 for a ROM transfer. Alternatively, try http://www.hdd-parts.com/firmware-transfer.html These URLs should help you identify the components: http://hddscan.com/doc/HDD_from_inside.html http://www.users.on.net/~fzabkar/HDD/HDD_ICs.txt http://www.users.on.net/~fzabkar/HDD/TVS_diodes.txt i did as you said but then came another problem the drive gets detected some times and disappears some time and when it appears it shows just about 7GB or something that too in recovery software i think now there is a problem with the head is it like that ???? before think it as head problem. you should repair PCB well or change good one. make sure diagnostic exactly. also i charge free for swap ROM chip

Author:	networkpc3000 [ October 27th, 2010, 22:09 ]
Post subject:	Re: Required PCB of seagate 500GB ST2500418AS
anudeep wrote: i have done as you said but there is another problem now you can check whether i have done that correctly Now the hard drive spin for few second and stops and also makes some tick tick sound you can hear that in hdd.rar file so can you tell me is it head or should i try with the PCB only hi, if you confident your PCB is fine then go ahead swap head. as your explain it look like head problem. do you have experience on such job? you'd better find out DR pro for help if no. take care your data. good luck

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