WD 1.5TB WD15EADS-00R6B0 Shuts Down Straight away

[odedshankar]

Hi Folks,

I have a WD 1.5TB WD15EADS-00R6B0 hard drive with a behaviour I have never seen before.
When i connect it to the DC or the HD Doctor, it moves for Busy for 0.5 a second and then it shows no device immediately.
Nnothing in the boot process is not kicking - i can't hear it spinning at all or even trying to.
It Shuts Down Straight away.

I was thinking TVS but checked them out all good.
I took a similar drive 1.5TB WD15EADS-00S2B0 and swapped the PCB to check it out, that is the result:
1. Donor drive with patient PCB - starts up and spins(Not talking about ready yet as no ROM Transfer).
2. patient drive with Donor PCB - starts up and spins(Not talking about ready yet as no ROM Transfer).
3. I saved both ROM Content 192KB - MCU FLASH.
4. I rewrote the donor PCB with the patient ROM content and connected it to the patient drive - and again the original problem happens - will shut down straight away with the donor PCB.

So i am suspecting that it is related to some ROM corruption of the patient drive.

Any advise, experiences you had will be very helpful.

Thanks,
Oded

[odedshankar]

Hi Guys,

Just a quick update.
I opened the drive up and found out the heads crushed on the surface and curved it good.
So after all it was a heads issue.
Maybe the Pre-amp is faulty and shorts the circuit on power up.

Cheers,
Oded

[jono-ats]

This series does a power-on-self-test for the heads that disables the motor if it detects a gross defect.

[odedshankar]

cheers Jono, it surely looks like it.
The only thing that I can't understand with this issue is that when i attached a donor PCB(from similar drive but ROM content wasn't transferred) it spined the faulty drive.
does the power on test instructions resides in the ROM?