Q: Please find attached photos for my SeagateDesktop Hdd ST4000DM000 pcb
Please advise as to which is the BIOS/ROM chip is on the PCB so I can go to local electronics have them swapped with new one I’ll get from you.
A: https://www.hddzone.com/st4000dm000-seagate-pcb-100710248-rev-c-p-1057.html is your donor PCB.
You can move the BIOS from your original PCB by using hot-air gun, then solder it on the replacement board. Please refer: http://www.datarecoveryunion.com/hard-drive-rom-chip-swapreplacement/. Or you can find an electronics repair shop help you.
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Note: Send clear photos of your PCB (both sides) by attachments will make everything easier!