Hi again (and sorry for all this text),
Well, the would-be donor drive showed up yesterday and it's probably the wrong PCB. It looks about the same from the bottom, but it's a 2060-771590-001 rev P2, where the dead drive needs a 2060-701537-002 rev P1 (or at least most of that number). If transferring the firmware is the only way to try a working PCB, I guess I'd have been dead there anyhow, since it sounds like on this generation of WDs it's all trapped in a giant BGA chip that I couldn't have worked with regardless.
I've included a picture where you can see a bit of charring if you guys know what areas a surge usually hits. I did notice some on the pin1 corner of the motor IC, which fzabkar pointed out as a 12v surge over at the HDD Oracle. Some of it didn't show up well in the pictures, but you can see it in the imprints in the foam. I don't know how much of it is just from normal long term heat though. That dark area in the center of the main processor for instance, just looks like some old foam residue, but the print in the foam looks horrible.
Is there any point in trying to check or swap any of the components which are usually damaged in these sort of events, or is a firmware transfer and full board swap what everyone typically does (or the safest solution)?
Assuming you guys are somehow reading and writing to that main chip rather than removing it, are there people who let you send them the two boards, or sell you a good one and perform the transfer for you?
If there's any other information, pictures, or sounds which might help, or anything I can do to narrow things down any further on my end, I'll gladly provide what I can.
*side note* I know and have read that a lot of the newbie traffic here comes from people in a sudden panic over their recent data loss. I'm definitely there and know you guys probably get really tired of dealing with it, and I apologize for adding to it, but it's an indescribable sick feeling. I've also called myself every name in the book for dragging my feet so long on making a backup, and know that it's my own fault. Ironically, I'm the guy that tells other people that they need to keep their important data on more than one drive. I had also finally just built a new machine with a new SSD to replace all this and was only days away from copying the content to the new drive when this happened. Lastly, none of this DIY thing in my case is about money if that's a usual motive. I'd gladly pay to have someone qualified handle it, but the drive has too much personal data of my own and other people's for me to feel comfortable sending the whole thing off. If the PCB part can be done by someone, that would be great.
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