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Wd caviar wd1600 not spinning up after pcb and u12 swap
http://forum.hddguru.com/viewtopic.php?f=26&t=30094
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Author:  Cribbyrhymes [ December 5th, 2014, 10:02 ]
Post subject:  Wd caviar wd1600 not spinning up after pcb and u12 swap

I'm hoping someone can help me. I think I may be at the data recovery company stage but I may be missing something. The hard drive was in an external enclosure and after a pc move to another room I must have accidentally hooked it up to the wrong power supply as I could smell burning and the drive wasn't spinning up. I quickly switched it off and after removing the pcb seen that the u1 chip was fried. After doing some research I purchased a replacement pcb online and I'm sure that all the numbers that need to match do. I then had an electronics shop do the u12 swap. I fitted the new pcb, connected it to the external enclosure and fired it up. Nothing happened, no spin up or noises of any kind. The drive wasn't recognised in windows. I connected it directly to the pc internally but exactly the same outcome. If I hold my ear really close to the drive when it's powered up I can hear a faint buzzing sound and the u6 chip gets really warm very quickly. I have attached pictures of the hard drive, old burnt pcb, new pcb etc. Any help would be greatly appreciated. Thanks

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Author:  labtech [ December 5th, 2014, 13:50 ]
Post subject:  Re: Wd caviar wd1600 not spinning up after pcb and u12 swap

Use search function with keyword "preamp".

Author:  fzabkar [ December 5th, 2014, 17:31 ]
Post subject:  Re: Wd caviar wd1600 not spinning up after pcb and u12 swap

Measure the resistances between each pair of motor terminals.

Author:  Cribbyrhymes [ December 5th, 2014, 18:08 ]
Post subject:  Re: Wd caviar wd1600 not spinning up after pcb and u12 swap

thanks for the reply fzabkar. Sorry for being a complete noob, I can work a multimeter but where are the motor terminals? Would you be able to explain this in more detail for me.
Thanks

Author:  data-medics [ December 5th, 2014, 19:23 ]
Post subject:  Re: Wd caviar wd1600 not spinning up after pcb and u12 swap

Cribbyrhymes wrote:
think I may be at the data recovery company stage


I agree. I think what Fzabkar is saying is that the drive likely has internal issues, possibly heads stuck to the platters.

Author:  thatdellguy [ December 5th, 2014, 19:51 ]
Post subject:  Re: Wd caviar wd1600 not spinning up after pcb and u12 swap

What you do to the drive at this current stage will determine its outcome. If you value your data send it to a professional. Whatever you do, don't open the drive. It will only make it worse and more expensive.

Author:  fzabkar [ December 5th, 2014, 20:21 ]
Post subject:  Re: Wd caviar wd1600 not spinning up after pcb and u12 swap

Cribbyrhymes wrote:
I can work a multimeter but where are the motor terminals?

There are 4 pins connecting the motor to the PCB. The resistance between each pair of terminals on the motor (not on the PCB) should be of the order of 1 - 2 ohms.

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                 Common
                   o
                   |
                   |
             +-----+-----+
             |     |     |
             |     |     |
             C|    C|    C|
   1-2 ohms  C|    C|    C|        Spindle Motor windings
             C|    C|    C|
             |     |     |
             |     |     |
             o     o     o
             A     B     C


If the motor is OK, then you may have a stiction fault.

Head stiction video by Waqas Ali:
http://www.mediafire.com/download/cvo59 ... k_head.zip

Waqas Ali is a SalvationData trainer:
http://www.alexsoft.org/viewtopic.php?f=88&t=622&p=1671

Of course he would normally perform the procedure in a cleanroom or clean chamber, and he would be wearing gloves.

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Author:  Cribbyrhymes [ December 8th, 2014, 18:34 ]
Post subject:  Re: Wd caviar wd1600 not spinning up after pcb and u12 swap

Ive measured the resistance across the motor terminals on the HDD with the following results

1-2 = .001
1-3 = .001
1-4 = .001
2-3 = .002
2-4 = .002
3-4 = .002

Does this mean that the motor is broken?

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