PCB 100536286

Seagate Momentus 5400.6 100536286 PCB Circuit Board

1. It’s from a Freeagent Go portable. I left PC on for overnight downloads with portable hdd. at morning the system was on standby mode and the HDD LED was off. there was a burning smell through the USB port on the casing. removed the casing and connected it to an external USB->SATA connector, the drive was spinning, but not at the full speed. It wasn’t getting detected in BIOS too. again connected it to the original casing, the LED’s were blinking on and off. now it’s not at all spinning up.
there are no visible damages on PCB. is it a PCB damage. how can I confirm it?
Any help is greatly appreciated.
Specs:
Seagate Momentus 5400.6 320GB
ST9320325AS
FW: 0001BSM1
PCB : 100536286 RevB

2. I have the following drive and I’m looking for a replacement PCB:
Drive: Seagate Momentus 5400.6
Size: 250GB
Model: ST9250315AS
PN: 9HH132-500
FW: 0001SDM1
PCB: 100536286 Rev B (100536284 C on Sticker)
Please write back if you have something that will work.

Buy this pcb online: 100536286