WD2000JS-00MHB0 burnt PCB

[edzknows]

Well today i smelled something very scary in my computer, and quickly turned it off.
I found that there was even a little smoke coming from a hard drive.
It wouldnt work anymore (not even spin or anything) so i removed the pcb and there was melted/burnt foam on the board.
3 separate chips seem to have overheated, and one fell off it was so bad.. lol (photo was taken before chip fell off)

I would like to replace the PCB and have read over some posts, though i know that it is unlikely that i can fix it.
How likely is it that the preamp is blown? the drive was NOT connected backwards, i think it was just a voltage spike.



thanks for the help

PCB


Close up


Back


Case

[hddmania]

awwwww..... Nasty melt. TerraNova should be near you in your country to assist you with this one, if you are looking for a pro to help you get your data.


Preamp wise, you really can't tell till someone physically test the drive. I have seen the worse and the Preamp was okay and on the other hand, I've seen a little damage to the PCB and the preamp was gone.

[pepe]

I am pretty sure the preamp is gone

It would be good to let someone who knows this stuff evaluate the drive.
U can find a similar board (1335), and try replacing the ROM (U12), but I am almost sure that piece of silicon is also dead.
So the best is to find a pro, preferably one that's able to deal with head replacement (just in case the preamp is dead). Unfortunately there are not many who like WD for head replacement ( why? they are so lovely I do like them).

pepe

[edzknows]

I am pretty sure the preamp is gone

You say that because? It would be nice to know your reasoning. I trust your advice, but i want to learn as well.
(eg: I am pretty sure the preamp is gone, Because of the really bad damage in the other parts/"XXXXX" part is damaged, signalling preamp damage...)

U can find a similar board (1335), and try replacing the ROM (U12), but I am almost sure that piece of silicon is also dead.

so you say i need a board that matches "1335" and not necessarily other numbers?
was thinking i needed to match the model number (WD2000JS-00MHB0), or is the 1335 directly related to the model number?


thanks for the replies

[pepe]

Here we go:

A burnt processor is a clean sign of the fact that the +5V power line got some overvoltage, and besides maybe the 12V too.
But preamp receives this 5V directly on these models (I mean there is no switching element that could have prevented the overvoltage reaching the preamp), so the preamp is probably in the same condition as the toasted ICs are.
U12 and U3 might have survived the disaster because they run on +3.3V alimentation, do not receive +5V.

2060-701335 REVA is the criteria, but 2060 and 70 rarely changes...
After swapping U12 U get an identical board (if U12 is fine of course).
Generally, if U get this board, swap U12 u can have 3 chances:
1. the drive does not spin up at all -> U12 is toasted too, U've got no more options, need pro help
2. Drive spins but clicking -> Preamp is gone, need pro help
3. Drive initializes correctly -> U may thank God and make a backup using a different power supply

pepe

[edzknows]

Here we go:

A burnt processor is a clean sign of the fact that the +5V power line got some overvoltage, and besides maybe the 12V too.
But preamp receives this 5V directly on these models (I mean there is no switching element that could have prevented the overvoltage reaching the preamp), so the preamp is probably in the same condition as the toasted ICs are.
U12 and U3 might have survived the disaster because they run on +3.3V alimentation, do not receive +5V.

2060-701335 REVA is the criteria, but 2060 and 70 rarely changes...
After swapping U12 U get an identical board (if U12 is fine of course).
Generally, if U get this board, swap U12 u can have 3 chances:
1. the drive does not spin up at all -> U12 is toasted too, U've got no more options, need pro help
2. Drive spins but clicking -> Preamp is gone, need pro help
3. Drive initializes correctly -> U may thank God and make a backup using a different power supply

pepe

THANKYOU
That was a truly perfect reply =)
I am very grateful for your time. I have now learnt things that I had no idea about before.
I dont claim to be professional, but at least with this knowledge im better off then before.

Also i am almost certain that there was a short on the 5V line. This re-enforces your answer too.
I think the 12v line was fine.

I will try switching the PCB.
What is a price range for PCB's? i know it will vary on where i buy it from etc. But i dont want to get ripped off.
And yes buying a PCB WILL be much less then going to a pro, so even if im getting ripped, it would still be cheaper, even though it might not work.

Thankyou again pepe, you have taken you time to help someone less knowledgeable.
You have become a greater person.

[networkpc3000]

hi,
like this donor drive easy to get. i had sent many out. i think you should try to swap PCB first if you have same model in hand.

[edzknows]

I have contacted you via email. Price of PCB's?

Also. Will using a donor pcb without changing the rom first have any chance of damaging the drive?
i would rather try the new pcb without doing any soldering (as things could get damaged in that process), and later if it doesnt work with the donor pcb, then swap the rom.

Seems many of these donor PCB's are available, is there any particular reason for that?

Is it morelikely that i can find an exact match and not swap the rom chip(/or if it is damaged on my damaged board).

[unknown]

3. Drive initializes correctly -> U may thank God

[edzknows]

3. Drive initializes correctly -> U may thank God

ahh thanks unknown.. im hoping im lucky, there is a small chance =)


Anyone answer my questions?

[unknown]

1st question : using a donor PCB without changing the rom will not damaging the drive.

2nd question : finding exact match ROM will be very hard, I don't think that your original ROM is damaged.

you have to transplant the original ROM to the donor PCB.

[zebong]

had a similiar case yesterday

but the marvel chip was not burned.


good luck

[edzknows]

1st question : using a donor PCB without changing the rom will not damaging the drive.

Thankyou, i have been wondering this for a while. So just to make sure, so risk?(of damage doing this)

2nd question : finding exact match ROM will be very hard, I don't think that your original ROM is damaged.

Well as the pcb seems common so far, what must i match to have an exact match?
I will check with the pcb's people have available so c if i can find the closest match that i can.

[unknown]

You have to match this letters ( DCM : DSBACT2AH ) as shown on your drive's label.

Good luck

[unknown]

there's 1335 - 003 for unicorn ( 80 GB MSA, MRA, LSA ... etc) & 1335 - 005

yours is ( 1335 - 005 )

[gtd4242]

I've only come across one other case where the ROM was damaged, and the replacement PCB would not power the drive, because of that damaged ROM. Question I have is, are you able to reprogram a donor ROM with PC3K, even when the original ROM has been destroyed? Having only experienced this one other time, I assumed it could not be done and wrote off the drive. However, if there is a procedure for that, I was curious where I might find some more information. Also, can this same procedure be done on other PCB's where the ROM data is stored within the Marvel chipset?

[edzknows]

I've only come across one other case where the ROM was damaged, and the replacement PCB would not power the drive, because of that damaged ROM. Question I have is, are you able to reprogram a donor ROM with PC3K, even when the original ROM has been destroyed? Having only experienced this one other time, I assumed it could not be done and wrote off the drive. However, if there is a procedure for that, I was curious where I might find some more information. Also, can this same procedure be done on other PCB's where the ROM data is stored within the Marvel chipset?

I would guess that it is possible for professionals to reprogram the rom, or replace it with a rom that have made specifically for it.
As long as they can deduce what exactly the rom needs to have on it, which would not be too easy, except for finding a perfectly matching drive?