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 Post subject: Samsung HD204UI not recognized
PostPosted: March 4th, 2018, 9:17 
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Joined: March 4th, 2018, 6:07
Posts: 5
Location: Germany
Hi

First thanks for this great forum.
After a steep learning curve the last week and a lot of reading I need to ask for your input.

I had an external drive enclosure with a backup drive. Then, as usual, at a certain point it just died.
I removed it from the enclosure and tried it in my pc and in my Sharkoon drive bay.

No success.

Next step I took was to order a "similar" pcb and changed it.
The behaviour in the drive bay changed, but still no spin up.
Now after some days of "testing" it at least spins up with the new pcb, but it is not recognized from the pc.

So I entered the next level and did a lot of reading.
I measured as described here:
viewtopic.php?p=166418#p166418

And then I looked at those:
http://www.users.on.net/~fzabkar/HDD/HD204UI_TVS.jpg

And it seems that the 12V is broken, as I measured a very low resitance with the 200 Ohm setting.

Now my question - under the assumption the data is ruined anyway.
Is it worth to spend the time to fix this 12V link in case, that the drive could spin up again with the "old" PCB and is then maybe recogized again?
And what would be the correct TVS to solder there?

Thanks in advance

Christian


Attachments:
File comment: The PCB I found on Ebay, which spins up the disc
EbayPCB.JPG
EbayPCB.JPG [ 2.97 MiB | Viewed 2387 times ]
File comment: The original PCB, which does not even spin up the disc
CurrentPCB.JPG
CurrentPCB.JPG [ 3.06 MiB | Viewed 2387 times ]
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 Post subject: Re: Samsung HD204UI not recognized
PostPosted: March 5th, 2018, 1:31 
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Joined: September 8th, 2009, 18:21
Posts: 11028
Location: Australia
ChrisKappe wrote:
it seems that the 12V is broken, as I measured a very low resitance with the 200 Ohm setting.

Do you mean that the 12V TVS diode has a low resistance? What is the resistance of the zero-ohm link?

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A backup a day keeps DR away.


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 Post subject: Re: Samsung HD204UI not recognized
PostPosted: March 5th, 2018, 15:37 
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Joined: March 4th, 2018, 6:07
Posts: 5
Location: Germany
Hi fzabkar,

the 0 Ohm shows no reaction on my Multimeter.
I tried from the 200 to the 200K range.

Not sure if it is an error 40.

Thats why I just attach the pictures with my measurements.

The 12V I measured with the 200 Ohm, the three other pictures are with the 2K Ohm.


Attachments:
File comment: 5v neg TVS
IMG_4017.JPG
IMG_4017.JPG [ 2.09 MiB | Viewed 2211 times ]
File comment: 12V TVS
12V_TVS.JPG
12V_TVS.JPG [ 2.6 MiB | Viewed 2211 times ]
File comment: 5V TVS
5V_TVS.JPG
5V_TVS.JPG [ 2.6 MiB | Viewed 2211 times ]
File comment: 0 Ohm
0_Ohm.JPG
0_Ohm.JPG [ 2.52 MiB | Viewed 2211 times ]
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 Post subject: Re: Samsung HD204UI not recognized
PostPosted: March 5th, 2018, 16:02 
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Joined: September 8th, 2009, 18:21
Posts: 11028
Location: Australia
The 12V TVS diode is shorted. You need to remove it.

The zero-ohm link is open circuit. You need to bridge it with a blob of solder.

After you have done your repairs, test the PCB off the drive. Be aware that your PCB was damaged by an overvoltage on the 12V supply, so make sure your PSU is producing the correct voltages.

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 Post subject: Re: Samsung HD204UI not recognized
PostPosted: March 5th, 2018, 16:59 
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Joined: October 21st, 2007, 8:48
Posts: 1283
If you ordered a matched PCB then replace and transfer ROM from patient to donor.


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 Post subject: Re: Samsung HD204UI not recognized
PostPosted: March 5th, 2018, 17:25 
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Joined: March 4th, 2018, 6:07
Posts: 5
Location: Germany
Thanks a lot!

I'll give it a try tomorrow, as I don't have equipment to solder.

But my uncle has ;)


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 Post subject: Re: Samsung HD204UI not recognized
PostPosted: March 6th, 2018, 15:22 
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Joined: March 4th, 2018, 6:07
Posts: 5
Location: Germany
Wow!

The disc spins now up and is recognized from the PC.

And I can "see" the root level of the drive with the folder structure.

But that is all :(
It clicks and clicks and does not read more.


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 Post subject: Re: Samsung HD204UI not recognized
PostPosted: March 6th, 2018, 15:33 
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Joined: September 8th, 2009, 18:21
Posts: 11028
Location: Australia
Quote:
I had an external drive enclosure with a backup drive. Then, as usual, at a certain point it just died. I removed it from the enclosure and tried it in my pc and in my Sharkoon drive bay.

No success.

Next step I took was to order a "similar" pcb and changed it.
The behaviour in the drive bay changed, but still no spin up.
Now after some days of "testing" it at least spins up with the new pcb, but it is not recognized from the pc.

It's not clear what happened here, but it appears that the drive has a head/media fault. If you wish to pursue a DIY solution, then try to clone the drive with HDDSuperClone or ddrescue.

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A backup a day keeps DR away.


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 Post subject: Re: Samsung HD204UI not recognized
PostPosted: March 6th, 2018, 16:58 
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Joined: October 21st, 2007, 8:48
Posts: 1283
ChrisKappe wrote:
But that is all :(
It clicks and clicks and does not read more.

At this point stop powering up the drive and contact the nearest pro for precise diagnosis. Sure if the data is important


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 Post subject: Re: Samsung HD204UI not recognized
PostPosted: March 8th, 2018, 3:55 
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Joined: March 4th, 2018, 6:07
Posts: 5
Location: Germany
Hi

I found now a local expert not far away from my home and will take it from there.

Again - thanks a lot for your support!


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 Post subject: Re: Samsung HD204UI not recognized
PostPosted: March 8th, 2018, 4:04 
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Joined: November 29th, 2006, 10:08
Posts: 7241
Location: UK
ChrisKappe wrote:
Hi

I found now a local expert not far away from my home and will take it from there.

Again - thanks a lot for your support!


Please check that’s it’s actually a proper DR company that does just that, and not just a “PC Guy” that also happens to offer “DR Services”.

Good luck!

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