The PCB on my Hard drive had a short circuit (probably because my brother connected 2 power sources to the drive)
Now its motor wont spin.
Would like help locating electronic component that blow up on my hard drive PCB,
I got the exact same hard drive from eBay - replaced the PCB but the drive is not working.
I would like to get the damaged electronic component (WE 75A) if you could help me locate it - I will appreciate it.
I prefer not to extract this component from the new drive because i don't want to ruin its PCB.
If you think i need to replace more parts - please share your thoughts.
Thank you for your help.
ISTM that your drive may be a Hitachi. If so, then you cannot simply swap PCBs. In fact in some cases you may also cause your donor PCB to stop working on its own drive. You need to transfer an 8-pin NVRAM chip from patient to donor. If you can provide a full photo, then I will be able to identify the NVRAM for you.
This is indeed a Hitachi drive,
It even states that its prohibited to connect both power terminals, what a poor design...
Here is a comparison of the new and old drive (old on right) and the NVRAM's
Do you still think its a go to replace the NVRAM?
Thank you very much for your help!
All may not be lost, however. In some drives the contents of the chip are backed up in a firmware module in the hidden System Area on the platters. Whenever possible, the following PCB supplier offers a free "PCB adaptation service":
The spindle motor receives power from the +12V supply, so I think it is unlikely that the motor is damaged. In any case you can measure the resistances between each pair of motor terminals and compare them against the donor.
The +5V supply powers the motor controller's digital logic, plus the preamp inside the HDA. If the preamp is damaged, then your DIY adventure will be over. Some drives won't spin up if the MCU cannot detect the preamp. I don't know if yours is one of these but you could test your donor HDD by placing a business card between the PCB and the HDA connector. If the drive now doesn't spin up, then this will prove that the MCU needs to see the preamp.
Another possibility is that the patient's preamp is shorting the -5V supply. If the patient drive spins up with the business card, then this would tend to confirm a shorted preamp.
BTW, I am amazed that the NVRAM appears to have survived.