Replacement Hitachi PCB 0A90398 is available on HDDZone.com. To swap Hitachi PCB with Main Controller IC Number 0A90398, your should make sure the Main Controller IC Number on your original pcb is 0A90398 too.
Hitachi PCB 0A90398 Image:
Hitachi PCB 0A90398
Hitachi PCB 0A90398 Additional Images:
Hitachi PCB 0A90398 Main Controller IC 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!