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 Post subject: Hard drive failed and won't spin up
PostPosted: October 20th, 2017, 4:33 
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Joined: October 18th, 2017, 11:39
Posts: 6
Location: Berlin, Germany
My WD Hard drive failed and won't spin up, while I'm trying to fix it, I found that it could be the TVSs which could cause this. So I took the diode estimation of the TVSs on my Hard drives.

The one circumnavigated red returns an estimation of 003 and the one orbited blue returns an estimation of 739.
So what must I do to get my Hard drives working once more? Should I replace the TVS diode? Can I replace this TVS DIODE 5VWM 9.2VC SMA?

Can anyone please suggest me, what I have to do to get my Hard Drive working again?

Any advice will be appreciated.
Many Thanks.


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 Post subject: Re: Hard drive failed and won't spin up
PostPosted: October 21st, 2017, 4:15 
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Joined: March 6th, 2010, 3:46
Posts: 266
Location: Kolding | Denmark
I would try to remove the tvs you measure to 003, if that's what you do. If a tvs breaks (shorts) it has been exposed to a psu with to high output voltage. You can easily have broken the tvs yourself and it may not be your only problem. I hear stories like yours every day, drive arrives with a shorted tvs, ends up having bad heads after being dropped. So take care, if data is important take your drive to a recovery professional now.

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 Post subject: Re: Hard drive failed and won't spin up
PostPosted: October 21st, 2017, 6:15 
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Joined: July 12th, 2014, 6:24
Posts: 74
Location: Germany
"Some" questions:

What kind of WD HDD is it: internal or external?
What happened before the drive was dead?
Does it show any sign of live?
Can you show us a picture of the PCB?
Do you have any experience with soldering?
Is the data important?

For TVS look here:

http://www.users.on.net/~fzabkar/HDD/TVS_diode_FAQ.html

If drive has external ROM you can also transfer ROM to working PCB but if data is important to you I would not mess it up.

PS: If you would like, I can have a look on it as we are also in Berlin ;-)

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 Post subject: Re: Hard drive failed and won't spin up
PostPosted: October 21st, 2017, 9:53 
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Joined: October 18th, 2017, 11:39
Posts: 6
Location: Berlin, Germany
digisupport wrote:
I would try to remove the tvs you measure to 003, if that's what you do. If a tvs breaks (shorts) it has been exposed to a psu with to high output voltage. You can easily have broken the tvs yourself and it may not be your only problem. I hear stories like yours every day, drive arrives with a shorted tvs, ends up having bad heads after being dropped. So take care, if data is important take your drive to a recovery professional now.


Thanks for your advice! Can I able to recover my HDD? HDD is not important, I need my all documents, it's very much important for me.

Thanks again for your help. :)


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 Post subject: Re: Hard drive failed and won't spin up
PostPosted: October 21st, 2017, 10:02 
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Joined: October 18th, 2017, 11:39
Posts: 6
Location: Berlin, Germany
Hello PCN,

My WD HDD is internal. I got dropped when I was adding another HDD on my CPU (SSD)
No, there is no sign.
Sure I will upload the HDD image soon.
Yep, I have a little bit experience about soldering!
Data is very very important for me. There is my personal documents and also my office documents.

Many many thanks for helping me. And sorry for my poor English.


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 Post subject: Re: Hard drive failed and won't spin up
PostPosted: October 21st, 2017, 10:54 
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Joined: October 16th, 2013, 13:21
Posts: 225
Location: Brazil
If it got dropped, why would you believe it to be a problem with the TVS diodes ? Was there also some PSU burnings , wrong connected cables ( easy to happen with modular PSUs ) ?

You could take it to PCN, as you are in the same city, and the data is important.


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 Post subject: Re: Hard drive failed and won't spin up
PostPosted: October 21st, 2017, 16:10 
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Joined: September 8th, 2009, 18:21
Posts: 9742
Location: Australia
rogfanther wrote:
If it got dropped, why would you believe it to be a problem with the TVS diodes ? Was there also some PSU burnings , wrong connected cables ( easy to happen with modular PSUs ) ?

The 5V TVS diode measures 3 ohms. I suspect that the OP has swapped modular cables between different PSUs, causing 12V to be impressed upon the HDD's 5V input.

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 Post subject: Re: Hard drive failed and won't spin up
PostPosted: October 21st, 2017, 16:43 
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Joined: October 16th, 2013, 13:21
Posts: 225
Location: Brazil
The picture which he says is circled in red / blue doesn´t appear to me. Is there some picture attached to his first post ? Maybe my browser is acting up.

The hdd was dropped. Of course, it may be that he used the wrong cables and fried the board, as I suggested, but it also may be that the hdd stopped working after the fall and the " intenet wisdom" said it should be the TVS diodes.


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 Post subject: Re: Hard drive failed and won't spin up
PostPosted: October 21st, 2017, 18:49 
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Joined: September 8th, 2009, 18:21
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Location: Australia
I don't see a photo as of this writing, but the OP's resistance measurements, and the link to a 5V TVS diode, would seem to confirm your theory regarding a cabling error.

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