Samsung HD154UI circuit board repair

[fatboy686]

Hi,
I have a Samsung HDD as above which was in a USB enclosure which my son used for storing his photos. The other night he plugged in the wrong PSU and managed to fry the thing Needless to say, he hadn't backed it up.

So, I've got the drive out of the enclosure and tried it in another one, but it won't power up at all, in fact it seems to stop the PSU from working???

Does anyone know if there are any fuses or other things that might have been damaged and cause this? Are there any circuit diagrams out there for this drive? Can I buy another drive of the same type and swap the boards over, just to get the data off?

Any other ideas?

Thanks in advance for your help,
Nigel.

[pcimage]

Search this forum for "TVS"

[fatboy686]

TVS, who would have guessed!

Thanks for the tip-off, that's exactly what it was, and now it's removed the drive is working again.

Thx, Nigel.

[harddrivespecialist]

Make sure you backup your data right away.

[EAAo]

Hey Guys,

I know it's been a fair wile between posts on this one, but I've had had exactly the same issue with the same HDD.

I'm going to test the TVS tonight and remove if thats the issue, although I wanted to know if the drive would work if I put it into my computer?
I saw in another thread a WD Green HDD had encryption, would that be similar with this drive as it came out of a LaCie external drive?

Cheers.

[HaQue]

some specifics would be good.. it is like saying, I know this Mitsubishi car has air-conditioning, but do you think my Ford does?

maybe put your model of Lacie into google along with the word "encryption" and see what comes up. it would be something like "securely encrypts files" or something along those lines.. or put your exact device details here and somone should be able to say yes or no.

some of the lacie names give it away like LaCie d2 Safe or LaCie Safe. Not sure if these are transparent encrypting or done with a user application. If you have setup any encryption or security with a LaCie utility, then the answer is probably it will not work hooking to computer.

[fzabkar]

Could we see detailed photos of both sides of the bridge PCB?

[EAAo]

Yep sorry,
Getting ahead of myself.

Included photos of the HDD and case it came from, it's a LaCie d2 Quadra v2.

I don't have the right tool to take of the PCB yet, if you need photos of the back I'll be getting it today and will post tonight/ tomorrow morning.

Appreciate any advice you can give,
Cheers.

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[HaQue]

It looks as if the LaCie software does any encryption, so I don't thing there is any hardware shenanigans going on.

You could connect power supply from PC only and see if it spins up, if so it may work in your PC. If it does, connect this disk and have an additional disk of greater size to store a disk image on. use DMDE to attempt a clone/image of the LaCie disk. Open DMDE, and select the disk, choose OK. when the partition windows shows, right click on the disk (The disk, not any partitions DMDE found) and choose "create image/clone. At the bottom, in destination section, choose "file" and save it to the larger other disk. then you can run Data recovery on the image and not damage the LaCie any further

Also, the photos FZabkar asked for aren't clear enough. try putting just the USB Bridge PCB (unscrew it) on a table about 30CM from a white wall or background. then shine a desk lamp or light on the wall to give ambient light. Shining light on the PCB makes bad photos. then play around with angles and take some clear photos of both sides. an Iphone or similar is usually fine for this. crop the image, but don't resize to kill the detail. a flatbed scanner can also take some pretty good "pictures" if there isn't too many raised components and depending on scanner and software and settings used.

[EAAo]

I've tried it in my PC, it doesn't turn on when it's plugged in (Fan turns on for a fraction of a second ) - same issue as fatboy686.

[fzabkar]

We don't need to see the back of the HDD PCB, so there is no need to remove it. It would be nice to see a better photo of the top (and bottom) sides of the bridge PCB, though.

I suspect that the 12V TVS diode on the HDD PCB will be shorted.

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[EAAo]

Thanks for the help, I'll get a better shot of those diodes tonight.

[EAAo]

Ok, here's the best I could do with my iPhone.
Nothing looks that weird?

Still haven't got the driver to take off the PCB, I'll goto the specialty store tomorrow morning.

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[data-medics]

You don't need to take it off to just test the TVS diodes. Just put a multimeter on there and check the resistance both ways to see if either is short circuited.

[fzabkar]

Thanks for the help, I'll get a better shot of those diodes tonight.

The original photos of the HDD PCB (the Hard Disk Drive Printed Circuit Board) were excellent. There was no need to repost the diode photos. I was just curious about the bridge PCB. That's the board with all the interfaces (USB, firewire, eSATA, etc).

[EAAo]

Ah I see.

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[fzabkar]

Your bridge IC is the OXUF934DSB-LQAG. According to the documentation, it does not support hardware encryption, so you should be OK with attaching the drive to a SATA port on your motherboard. Just remove the 12V TVS diode, after confirming that it is shorted.

http://www.mouser.com/ds/2/38/Product_B ... 514902.pdf
http://www.semiconductorstore.com/pdf/n ... torage.pdf

[HaQue]

BTW, GREAT photos! Thanks, It helps to build up many threads of different HDD PCB's, bridge boards etc, and the better the photos, the more useful it is to the OP, and everyone with similar issues in the future.
If it works, remember it is just to backup the DATA, and I personally would never use that drive again.

[EAAo]

Thanks for the advice guys, you've all been really helpful.

I got a multimeter today, I'll let you know how I got with the mission.

I have another inquiry about another HDD, but I'll make another thread later.

[EAAo]

I Have never used a Multimeter before, and I don't know if I'm using it wrong or the diodes gone.

From the guide Spildit posted, I'm supposed to set the multimeter up like this?

Then touch each lead to each side of each TVS diode?

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