Q: seagate pcb 100802503 rev a
Board is not powering up at all. Diodes might have been bad.
Do I need to swap out the bios on this board?
A: You can try. https://www.hddzone.com/seagate-pcb-100802503-p-3420.html is your donor PCB.
When you get this PCB, you need to move your original PCB’s BIOS to the replacement 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!