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andy50337
 Post subject: Wanted Hitachi PCB
PostPosted: March 27th, 2011, 14:07 
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Joined: March 27th, 2011, 13:58
Posts: 7
Location: England
Hi
I am looking for a replacement pcb for a hitachi 1tb hard drive model number HDT721010SLA360 the number of the board is 0A29989 BA3129 Mzh918 W3W6 If anyone can supply this please contact me at andyslowther@hotmail.com

Many thanks
Andy
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pcimage
 Post subject: Re: Wanted Hitachi PCB
PostPosted: March 27th, 2011, 17:16 
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Joined: November 29th, 2006, 10:08
Posts: 7864
Location: UK
What's the problem with the drive?

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andy50337
 Post subject: Re: Wanted Hitachi PCB
PostPosted: March 27th, 2011, 17:21 
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Joined: March 27th, 2011, 13:58
Posts: 7
Location: England
I connected the wrong power supply to the drive. I have already tried it in another enclosure and it does not work.
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fzabkar
 Post subject: Re: Wanted Hitachi PCB
PostPosted: March 28th, 2011, 0:59 
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Joined: September 8th, 2009, 18:21
Posts: 16960
Location: Australia
The usual culprit (12V TVS diode) is identified in this photo:
http://www.media-itservices.com/burned1.jpg

If your diode is shorted, then remove it with flush cutters. The drive will work without it, but it will no longer have overvoltage protection on the +12V supply. The other large diode is the 5V TVS diode. You can replace the 12V TVS with an SMBJ12A, and the 5V TVS with an SMAJ5.0A. Farnell UK should stock both.

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andy50337
 Post subject: Re: Wanted Hitachi PCB
PostPosted: March 28th, 2011, 2:58 
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Joined: March 27th, 2011, 13:58
Posts: 7
Location: England
Hi
Thanks for the info which one should I try removing first and Wii it work with both removed or do I need to replace them?
Thanks
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fzabkar
 Post subject: Re: Wanted Hitachi PCB
PostPosted: March 28th, 2011, 3:27 
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Joined: September 8th, 2009, 18:21
Posts: 16960
Location: Australia
Get hold of a digital multimeter (US$10). Set in on the 200 ohms range and measure the resistances of each diode. If either diode measures close to 0 ohms, then remove it, otherwise leave it alone. You only need to replace the diode if you can't guarantee that you won't repeat your mistake. :-)

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networkpc3000
 Post subject: Re: Wanted Hitachi PCB
PostPosted: March 28th, 2011, 4:02 
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Joined: December 16th, 2007, 10:26
Posts: 1151
hi,
i have this PCB in stock. please feel free to contact me if need. also i saw your PCB look D3 has been burned. check it! if so just remove it.

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andy50337
 Post subject: Re: Wanted Hitachi PCB
PostPosted: March 28th, 2011, 17:02 
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Joined: March 27th, 2011, 13:58
Posts: 7
Location: England
Hi
What would be the effects of fitting a board with a different firmware chip ?
Thanks
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fzabkar
 Post subject: Re: Wanted Hitachi PCB
PostPosted: March 28th, 2011, 17:59 
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Joined: September 8th, 2009, 18:21
Posts: 16960
Location: Australia
I'm not a DR guy, but AIUI there is the risk that fitting a non-native PCB could cause the NVRAM to be rewritten, thereby corrupting both the patient and donor.

NVRAM and NVRAM Repair:
http://www.datarecoverytools.co.uk/2009 ... am-repair/

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andy50337
 Post subject: Re: Wanted Hitachi PCB
PostPosted: March 29th, 2011, 4:00 
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Joined: March 27th, 2011, 13:58
Posts: 7
Location: England
Thanks for the info guy's I have got a multi meter and will check the diodes when I get home from work.
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andy50337
 Post subject: Re: Wanted Hitachi PCB
PostPosted: March 29th, 2011, 12:43 
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Joined: March 27th, 2011, 13:58
Posts: 7
Location: England
I have just measured the resistance of the diodes and d3 is 0.9 ohms and d4 is open circuit. I have allso measured the voltage coming out of my usb adaptor and the red wire reads 4.9v and the yellow 12.7. Is it safe to remove d3 and give it a try or should I replace d3 before trying.
Thanks
Andy
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fzabkar
 Post subject: Re: Wanted Hitachi PCB
PostPosted: March 29th, 2011, 16:47 
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Joined: September 8th, 2009, 18:21
Posts: 16960
Location: Australia
andy50337 wrote:
I have just measured the resistance of the diodes and d3 is 0.9 ohms and d4 is open circuit. I have allso measured the voltage coming out of my usb adaptor and the red wire reads 4.9v and the yellow 12.7. Is it safe to remove d3 and give it a try or should I replace d3 before trying.

Yes, that should be safe.

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pcimage
 Post subject: Re: Wanted Hitachi PCB
PostPosted: March 29th, 2011, 17:03 
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Joined: November 29th, 2006, 10:08
Posts: 7864
Location: UK
andy50337 wrote:
I have just measured the resistance of the diodes and d3 is 0.9 ohms and d4 is open circuit. I have allso measured the voltage coming out of my usb adaptor and the red wire reads 4.9v and the yellow 12.7. Is it safe to remove d3 and give it a try or should I replace d3 before trying.
Thanks
Andy


Yes, it's worth a shot. Ideally you should replace D3 as a safety option, but if the drive doesn't start up immediately then cut the power right away.

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andy50337
 Post subject: Re: Wanted Hitachi PCB
PostPosted: March 31st, 2011, 13:21 
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Joined: March 27th, 2011, 13:58
Posts: 7
Location: England
Hi all
Latest update I removed 12 v diode double checked voltage and gave it a try, the drive spun up but faster than I've ever heard one spin before so I unplugged. Looks like new pcb is needed. Thanks again for all the help.
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Eric Lee
 Post subject: Re: Wanted Hitachi PCB
PostPosted: April 1st, 2011, 1:30 
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Joined: April 25th, 2009, 11:42
Posts: 382
Location: China
Hi, I have this working PCB, pls let me know when you need it.

Thanks, Eric

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