Hello,
My WD1001FALS encontered a power surge and the pcb fried out. The pcb does not seem to have the U12 Rom on it. Any advice on where the ROM is located and how to swap it out to a donor PCB?



Thanks the input!

In the IC with the big 'M'... Bad news eh ?

If you have expensive tools you may not need to swap chip. Is this a ROYL drive?

On that model the damaged over the spindle controller could be damaged the MHA too unfortunely

Then you have real problems.

And I'm seeing quite a few cases with damaged PCB and preamp on WD drives.

I have dealt with this one, last week. I'm not sure it's ROYL arch. or not, but ROM is inside MCU, that's for sure. When the PCB fried, this is gonna be a PITA job if you don't have proper tools. With WD drives, many times I encountered situations where the Marvel MCU is dead, preamp is gone too. This is the worst scenario

*Can we recreate ROM from SA for this model, manually with hex editor ?
+ Yes, theoretically possible if you know which part of each modules must be put where. I had enough headache using this "Rambo XII" method. Remind you, you'll have to have access to write to SA after successfully write ROM also, otherwise the previously painful task of recreating ROM will be useless.

*Will PCB hot swap work ?
+ NO. Not a chance against this one

*Will PCB cold swap work ?
+YES, if you know what to do next

*Any other way to recover data easier besides using expensive tools ?
+ No, as far as my knowledge. Except you really are a "HDD Guru"


Conclusion :

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My Forum

Apart from the expensive ideas, it is worth trying to replace U1 and check the TVS diodes and fuses, and other components.
if they look fine, case might be solved by swapping U1 if u are lucky enough.

pepe

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Adatmentés - Data recovery

Agree with pepe, this pcb is quite simpe.
In this way, more easy to rebuild the whole pcb instead of replacing the MCU without proper tools....

If the MCU is damaged, than.....

Anyway, use some protections for trying!

Janos

It would be safer to replace U1, the diodes and Q2, the low ohm resistors etc. but is it worth ?