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Rudra
 Post subject: Rare Seagate PCB repair help needed
PostPosted: November 28th, 2016, 10:57 
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Joined: August 10th, 2015, 9:00
Posts: 41
Location: asia india
Dear friends
This Seagate hard disk is precisely 10 year old & very rare . Its pcb is shorted and when powered pc does not start.
I am not getting donor pcb so the only option is to carefully repair patient pcb.
I think one of the diode is opened .
Can someone pls. help me to diagnose pcb
Thank you

Family -- Barracuda 7200.9 ( first time I have seen 500GB hard disk (classic non F3) in this family 7200.9)
Hard disk model - ST3500841AS
FW -3.AGE
PCB rev. - 100383395 Rev. B


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data-medics
 Post subject: Re: Rare Seagate PCB repair help needed
PostPosted: November 28th, 2016, 11:21 
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Joined: April 3rd, 2011, 0:19
Posts: 2003
Location: Providence, RI
Not that rare:

http://www.ebay.com/itm/Seagate-ST35006 ... 4d44964021
http://www.ebay.com/itm/PCB-Seagate-ST3 ... Swt7pXNnE4
http://www.donordrives.com/catalogsearc ... =100383395

However, given what you're describing I'd guess that the TVS diodes might be shorted. If you just need data back you can likely just remove the shorted one and copy the data out using a clean power supply. I've circled what they look like in red here:


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fzabkar
 Post subject: Re: Rare Seagate PCB repair help needed
PostPosted: November 28th, 2016, 14:25 
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Joined: September 8th, 2009, 18:21
Posts: 16960
Location: Australia
http://www.users.on.net/~fzabkar/HDD/TVS_diode_FAQ.html

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JGAN
 Post subject: Re: Rare Seagate PCB repair help needed
PostPosted: November 28th, 2016, 17:04 
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Joined: November 27th, 2012, 21:59
Posts: 94
Location: Upstate NY, USA
Which diode and what is the reading you are getting in both directions? Is it getting hot? Most likely can be removed.
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Rudra
 Post subject: Re: Rare Seagate PCB repair help needed
PostPosted: November 29th, 2016, 9:07 
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Joined: August 10th, 2015, 9:00
Posts: 41
Location: asia india
Thank you data-medics , fzabkar & Jgan

I will test diodes by removing one by one & update result.

Thank you , I am sure this will help.
Fzabkar has written comprehensive article on diodes , very much useful , special thanks. :D
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cdma-india
 Post subject: Re: Rare Seagate PCB repair help needed
PostPosted: November 30th, 2016, 16:04 
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Joined: January 5th, 2016, 9:38
Posts: 8
Location: mumbai
Rudra wrote:
Dear friends
This Seagate hard disk is precisely 10 year old & very rare . Its pcb is shorted and when powered pc does not start.
I am not getting donor pcb so the only option is to carefully repair patient pcb.
I think one of the diode is opened .
Can someone pls. help me to diagnose pcb
Thank you

Family -- Barracuda 7200.9 ( first time I have seen 500GB hard disk (classic non F3) in this family 7200.9)
Hard disk model - ST3500841AS
FW -3.AGE
PCB rev. - 100383395 Rev. B

if pcb repair its very good else contact me for working pcb (919869000986)
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Rudra
 Post subject: Re: Rare Seagate PCB repair help needed
PostPosted: December 1st, 2016, 7:20 
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Joined: August 10th, 2015, 9:00
Posts: 41
Location: asia india
Dear Team
Thank You so much for all the help.
Data-medics diagnostics was precisely right. One diode which he has marked was short . I removed that diode and disk got normal detection.
100 % data from disk was recovered successfully.
Thanks again. :D

cdma-India -- I have noted your no. Pls. PM your email id and address , I will contact you for spares.
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Omega
 Post subject: Re: Rare Seagate PCB repair help needed
PostPosted: December 1st, 2016, 11:40 
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Joined: September 21st, 2016, 14:37
Posts: 40
Location: New York
Awesome dude! It is nice when you run into those kind of situations. Makes life easier sometimes than dealing with these "problem children" for hard drives we occasionally get. :mrgreen:

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Rudra
 Post subject: Re: Rare Seagate PCB repair help needed
PostPosted: December 2nd, 2016, 2:27 
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Joined: August 10th, 2015, 9:00
Posts: 41
Location: asia india
Thanks Omega. You are right. :D
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