Hello.
I have connected my WD Elements 1 Tb to wrong power supply and it stopped working.In Disk Management it shows my HDD as 1 Tb unallocated space, Windows asks to set MBR for HDD, while doing it, I get I/O error. I was able to recover whole files with GetDataBack software, but all files were corrupted. HDD Regenerator and Acronis software doesn't see HDD. I checked HDD with Victoria program, and it showed, that whole HDD consists of bad sectors. I suppose, that wrong power supply cant cause HDD to become 1 big bad sector.
So, is this problem in PCB, or in Head Stack Assembly? I read, that wrong supply usually damages TVS diode- can such behavior of HDD be caused by damaged TVS diode?

Model: WD10TMVW-11ZSMS5
PCB Sticker: 771814-401 02P
PWB: 2060-771814-001 REV P1

I attach photos of HDD, and both sides of PCB. Please help me to locate TVS diode. Any advice which can help in getting files back is much appreciated.

The problem is not with the electronics. More than likely internal with the read/write elements. Without experience, knowledge and proper tools, can't get too far. If data is important send it to a specialist. If not, donate it, recycle it or RMA it if still under warranty.

Can get a little more insight on the complexity by reading around the forum. Perhaps the beginner section.

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Hard Disk Drive (HDD), Solid State Drive (SSD, SATA, NVMe, etc), USB Flash Drive and RAID Data Recovery Specialist in Massachusetts

With read/write elements- you mean problem with head assembly?
PS Data is important, but DR company requires money, that I cant give. So I loose nothing, if I have even a little chance to recover info, I will use it.

Yes, read/write heads.

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Hard Disk Drive (HDD), Solid State Drive (SSD, SATA, NVMe, etc), USB Flash Drive and RAID Data Recovery Specialist in Massachusetts

I read now on one forum, that such situation- I/O error while accessing disc, was caused by damaged INIC 1607E controller. Is it controller, that I marked on photo? And can this controller, while damaged from overvoltage, really cause read/write error?

I believe that if the problem was electronics related, the drive would have never been seen in Victoria as you described. Unless your interpretation of "seen" is something else.

Either way, more advanced testing is necessary to rule out problems.

This is a USB based drive, so maybe explaining in more detail how you connected the way that caused the say issue may shed some light.

Also, do you have a link to that forum you mentioned?

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Hard Disk Drive (HDD), Solid State Drive (SSD, SATA, NVMe, etc), USB Flash Drive and RAID Data Recovery Specialist in Massachusetts

http://forum.ixbt.com/topic.cgi?id=11:45207

This is my case- Windows see HDD as unallocated, while any access getting I/O error. Result- dead INIC 1607E controller. Unfortunately, that forum is no longer available. I found the link, on how to bypass dead controller. I will try it and write about results.

You probably won't solve your problem, but here are the SATA Tx/Rx connection points and coupling capacitors.

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A backup a day keeps DR away.