Q: PCB NUMBER:BF41-00315A 05
A: https://www.hddzone.com/samsung-pcb-bf4100315a-p-371.html is your donor PCB.
When you get this PCB, you need to move your original PCB’s BIOS to the replacement PCB. The 8pins (4 pins on each sides) with 25P05VP、25P10VP、25F512、25F1024、25F1024AN、SST25VF512、SST25VF010, etc. are the BIOS.
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Note: Send clear photos of your PCB (both sides) by attachments will make everything easier!