Question about migrate a PCB ROM

[gacpac]

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?

[deftrue]

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.

[gacpac]

Good to know

But the numbers need to be almost the same


Thanks for the answer

[Nick_CT]

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.

[gacpac]

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.

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.