Replacement Hitachi PCB OA90381 is available on HDDZone.com. To swap Hitachi PCB with White Paper Number OA90381, your should make sure the White Paper Number on your original pcb is OA90381 too.
Hitachi PCB OA90381 Image:
Hitachi PCB OA90381
Hitachi PCB OA90381 Additional Images:
Hitachi PCB OA90381
Hitachi PCB OA90381 PCB Number
For most of the PCB boards, we also need to swap the BIOS Chip from your original PCB to the replacement PCB, in order to make the PCB compatible with you hard drive.
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Note: Send clear photos of your PCB (both sides) by attachments will make everything easier!