Western Digital WD10EARS-00VWB0 - DEAD/no signs of life

[pickleit]

This is the first of 2 sata hard drives that have come into my workshop this week and both present as "DEAD/no signs of life".

I need help in fixing the PCBs of these hard drives. I will try to explain as much as I know and what I am trying to find out, for each drive.

First..... The Backstory:
Both drives were connected to a semi-modular PSU. The PSU suffered a problem and 'died'; the PSU and only the PSU was changed for a new working one. The modular cables from the old PSU were left in place and when the NEW PSU was powered on, this is when the hard drives died; that's what I was told.

What I know / don't know:

Seagate ST1000DX001 (1TB 3.5" HHD)
==================================
[Pictures C, D, E]

PCB serial #: 2060-771698-002 REV-P1

Components with obvious damage:
U1 - Smooth L7251 3.1 Spindle motor + VCM controller ST Microelectronics Chip

As shown in pictures C & E, the U1 chip is clearly damaged.

Question:
4) Are there any other components that I should test.

Attachments

Picture E

Picture D

Picture C

[unknown]

Seagate ST1000DX001 (1TB 3.5" HHD)
==================================
[Pictures C, D, E]

PCB serial #: 2060-771698-002 REV-P1

You meant WD not ST.
Find a working PCB and transfer U12 from patient to donor PCB.
Good luck

[data-medics]

I think the OP switched his titles of the two topics he started.

As to this one, Unknown has it right. Just find another PCB with number 2060-771698-002 REV P1 (doesn't matter what model it's from) and move the U12 chip over to to the new board. You'll waste far more time and effort trying to fix the original board than it'll take to just replace it with ROM transfer.

[pickleit]

I think the OP switched his titles of the two topics he started.

As to this one, Unknown has it right. Just find another PCB with number 2060-771698-002 REV P1 (doesn't matter what model it's from) and move the U12 chip over to to the new board. You'll waste far more time and effort trying to fix the original board than it'll take to just replace it with ROM transfer.

Yup, I got the titles of the two posts mixed up. I would change the title, but I don't have the ability to do so.

[fzabkar]

Mixing cables between modular PSUs often results in 12V being impressed on the 5V supply. I would expect that the 5V TVS diode (D3) will be shorted, and its associated zero-ohm resistor (R67) open.

Catastrophic failures in Western Digital PCBs:
http://www.hddoracle.com/viewtopic.php?f=59&t=1119&p=5033

Edit: There is a high likelihood that the drive's preamp has been damaged.

[data-medics]

Mixing cables between modular PSUs often results in 12V being impressed on the 5V supply. I would expect that the 5V TVS diode (D3) will be shorted, and its associated zero-ohm resistor (R67) open.

Catastrophic failures in Western Digital PCBs:
http://www.hddoracle.com/viewtopic.php?f=59&t=1119&p=5033

Edit: There is a high likelihood that the drive's preamp has been damaged.

I think you're referring to his other case he posted with the Seagate drive. This one, while it might have blown TVS, clearly has a blown motor control chip. PCB replacing time

[fzabkar]

Mixing cables between modular PSUs often results in 12V being impressed on the 5V supply. I would expect that the 5V TVS diode (D3) will be shorted, and its associated zero-ohm resistor (R67) open.

Catastrophic failures in Western Digital PCBs:
http://www.hddoracle.com/viewtopic.php?f=59&t=1119&p=5033

Edit: There is a high likelihood that the drive's preamp has been damaged.

I think you're referring to his other case he posted with the Seagate drive. This one, while it might have blown TVS, clearly has a blown motor control chip. PCB replacing time :D

I am fully aware of the situation. It appears that both drives experienced an overvoltage on the 5V supply. The Seagate HDD most probably survived (apart from the diode and resistors), but the WD drive most probably sustained a damaged preamp in addition to the obviously damaged motor controller. If D3 and R67 are damaged, then this would be good reason to be concerned for the preamp.

[pickleit]

Mixing cables between modular PSUs often results in 12V being impressed on the 5V supply. I would expect that the 5V TVS diode (D3) will be shorted, and its associated zero-ohm resistor (R67) open.

Catastrophic failures in Western Digital PCBs:
http://www.hddoracle.com/viewtopic.php?f=59&t=1119&p=5033

Edit: There is a high likelihood that the drive's preamp has been damaged.

I think you're referring to his other case he posted with the Seagate drive. This one, while it might have blown TVS, clearly has a blown motor control chip. PCB replacing time

I am fully aware of the situation. It appears that both drives experienced an overvoltage on the 5V supply. The Seagate HDD most probably survived (apart from the diode and resistors), but the WD drive most probably sustained a damaged preamp in addition to the obviously damaged motor controller. If D3 and R67 are damaged, then this would be good reason to be concerned for the preamp.

[5V rail] - Diode D3 has continuity and 00.4 ohms resistance in either direction. Resistor R67 has continuity (closed circuit).

[12V rail] - Diode ? - no continuity in either direction. The DMM in diode/continuity mode shows ~1500 when +ve is on the cathode and ~545 when +ve is on the anode. Resistor R64 has continuity (closed circuit).

U1 is obvious damaged.

So... do either of the diodes need to be replaced, as well as U1?

Thanks

[fzabkar]

The fact that R67 is intact is a good sign. This means that the preamp may have survived. As Data-Medics has already stated, it would be far easier to replace the PCB and transfer the 8-pin serial flash memory IC at U12 from patient to donor. Some PCB suppliers (eg hdd-parts.com) offer a free transfer service.