OK, I checked the listing of the PCB board I purchased.
The firmware revision are both 3.03

I did note that the part numbers are slightly different, however.
My customers drive is 9P5004-003
whereas the replacement board is 9P5004-034.
Both PCBs are SG22580-300 Rev A
The white sticker on the 40 pin header are both labelled SG22580-101REVA

The barcode white sticker near where the PCB model number on the customers is 1040 00SY
whereas the replacement is 7034 JE4G.

there is some serious problem if you don't get any output on the terminal. I have lost the thread a bit, have no time to read all the posts.
If your donor pcb does not spin it up, neither spits anything out on terminal, it is most probably not working.
Get another board or possibly a working drive.

pepe

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Adatmentés - Data recovery

If you have a scope, check the crystal. Do you measure 2.5VDC at each end?

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A backup a day keeps DR away.