Hi,

i was just wondering because i never tried this out.

When you have a fried pcb usually you change the PCB and migrate the ROM if it's needed to a donor PCB that exactly matches the fried one.

I was wondering actually needs to really identical both PCBs?

Using an example like WD

PCB Number: 2060-771698-002 REV A
PCB Sticker: 2061-771698-802 AA

what i have a donor that have this (this number is fake btw)

PCB Number: 2060-771695-001 REV B
PCB Sticker: 2061- 771695-796 AG


Can be that compatible?

Sometimes it can work. Sometimes, you may find that on one PCB microcode is internal, and on the other PCB it is external, resident in a Flash chip. So you would need the right tools as always, but yep, it does work sometimes.

Good to know

But the numbers need to be almost the same


Thanks for the answer

Going on the PCB numbers you provided you're talking about WD and it's straightforward, match the number etched into the PCB, example 2060-771698-002. I've never found the revision (REV) or sticker on the PCB to be of any use in finding a PCB donor.

This is assuming that your PCB has U12 (ROM is at U12 and not in MCU).

Seagate, match the PCB number again. You'll often find that 2 PCBs with the same PCB number will have MCUs made by different manufacturers.

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Yes i understand that, my question it's because sometimes i have same pcb but i prefer to buy another with more similitude because i don't know what could happen if i migrate the rom in that case.