Hello.

Hope you can help me with this issue. Thanks in advance.

I have a dead Seagate 500GB Barracuda 7200.12, ST3500418AS, P/N: 9SL142-303, firm: CC46, PCB 100532367 rev B with chipset ST V60131 and driver ST "SMOOTH" UM04. I was happy to find 12V TVS shorted, but there was more damage . The SOP8 schottky + mosfet was short too, and I think that there’s another shorted component. Looks like a surge or killer power supply. This pushes me to replace PCB and I’m considering one from a good ST500DM002 I have at hand.

ST500DM002 has a PCB 100535704 rev C, chipset LSI B5502D0 and driver ST "SMOOTH" UM04. Both boards have identical shape and layout, but have different brand IC’s (possibly compatibles or doing the same).

Can I use 100535704 PCB in place of 100532367 if I just swap SOP8 Flash IC ?

Hello Chungalin, they are not compatible, you have to find a PCB with the same number and then swap the ROM chip.

It is compatible.

There is a decent chance that it's compatible as long as the main IC is the same (though I have my doubts in this case, but I'm too lazy to go check them ). I do always try to match the code, but in a pinch if it's a rush job I've been able to get away with ones that were just close enough. Only issue is if it doesn't work you won't know for sure if it's bad heads or incompatible PCB....

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i always try to match the PCB number aswell.

Since there wasn’t a full consensus in your comments, I’ve decided to try it.

It works. I’ve had some problems but it was due to a bad SATA cable.

So, my conclusion is that both PCB (100532367 rev B, and 100535704 rev C) are compatible in this case, even having different brand CPU (ST vs. LSI).

Both PCB look identical to me. I mean the printed circuit alone. Passive components in the same places. The only common IC is ST "SMOOTH" UM04 driver.