Seagate 1Tb "SSHD" dead PCB

[syntaxerror]

Well, in pcimage's original case (note this thread was in fact started last year), the first "weapon" I would wield next would be a scrap of fine sand paper.
Anyone noticed the dark-ish spots on the 18 contacts (upper right)?
One of my "dead" drives could actually be saved that way long ago, because lots of those contacts were simply oxidized, making "0" or "1" states get determined more or less randomly

[fzabkar]

... the first "weapon" I would wield next would be a scrap of fine sand paper.

Use a soft pencil eraser instead.

[pepe]

there are simple ways to block NAND access, but it won't solve anything.

[syntaxerror]

Use a soft pencil eraser instead.

OK fair enough, however I think this would fail with some more severely oxidized contact reeds...Nevertheless, I do concede that my method will require a lot more fine skills and maybe experience too - to make sure that none of the sensitive tracks on the PCB will get damaged in the process.

[pepe]

eraser always worked for me (when oxide was a problem)

[Dataq]

Thanks for the suggestions. The contacts on our PCB are very clean so it's not that. We are thinking either corrupt NAND or ROM, as we had a similar case recently. We got the ROM & NAND switched by a professional electronics company to a donor PCB and the problem followed those components.

[digisupport]

I had the same experience, swapped ROM and NAND to new pcb, same problem. Donor NAND and ROM on patient pcb - doner is working fine again.

Btw. for pcb cleaning a fibre glass brush is very handy
http://uk.rs-online.com/web/p/pcb-clean ... s/0514868/

[syntaxerror]

Thanks for the link - very informative and helpful.

[HaQue]

Use a soft pencil eraser instead.

OK fair enough, however I think this would fail with some more severely oxidized contact reeds...Nevertheless, I do concede that my method will require a lot more fine skills and maybe experience too - to make sure that none of the sensitive tracks on the PCB will get damaged in the process.

There is a very good reason for not using sandpaper on contacts. Most contacts are made from some common metal and plated very thinly with nickel or nickel and gold or other. when you sand the contacts, you remove this plating exposing the underlying metal that will likely rust quite quick.

an eraser will clean but not damage.

for an anecdote, I had quite a number of torches that I would take fishing for Snapper, so near salt water the terminals would corrode. I would clean the contacts with sandpaper, thinking the torches were just crappy. You wouldn't believe the amount of totally rusted torch battery terminals I had. As Mr Obvious's long time listener, first time caller would say "oh, I never made the connection"

[fzabkar]

I was taught that even an eraser, if applied too vigorously or too often, could take off some of the gold plating. The same goes for metal polish.

[datarecoveryexpert]

I also got same hard drive, couple hybrid SSHD 2.5 and 3.5 inches like ST2000DX001 with such a problem and I had to find a solution by self to this SSHD type hard drives.
As it turned out just need to disable the NAND functions and used as a normal hard disk, or to clear the NAND content and update it.
Use the terminal commands on Level N (NAND level). You can even remove NAND from PCB after disable it.
If terminal not works, or hard drive freezing there's need to modify the firmware ROM to start hard drive firmware use service area only from plates.
It only necessary to disable hard drive COMBO mode.
And it not help just replace ROM to new logic board !!!
The entire service area located on the disk plates. And there is a second copy of the NAND for fast start and NAND tables for cache operations.
Also NAND chip stores the last recorded user data 4-6 GB. It is advisable not to lose them.
And it is desirable to save all the data from CLUMP blocks on plates (use flush out native hard drive features).
I think ACE lab will release firmware patch or firmware diagnostic overlay loader for fix it in next couple months.

[Doomer]

На второй год Зоркий Сокол заметил что у сарая нет одной стены

[datarecoveryexpert]

На второй год Зоркий Сокол заметил что у сарая нет одной стены

Да нет просто искал решение как победить проблему и не нашел.
Пришлось как всегда решать все самому.
Может что-то и не увидел но это уже не важно. Главное что данные сохранил.