Burnt PCB board for hard drive 640G

WD Internal Drives Desktop & Mobile Drives
1

Hard drive label.JPG
Hard drive label.JPG2448×3264 2.58 MB
burnt smooth chip.JPG
burnt smooth chip.JPG2448×3264 2.62 MB
Dear All, 

I have Hard drive 640GB. (its label as shown in pic). i had surge in elec. damaged the “smooth chip” ( as shown in pic).

I sawped  its PCB with another one with the same part no. but it still not working. I want to recover my data from the damaged hard drive. 

Is it possible to replace the smooth chip between PCB? if i do that it will works? What is the function of it?

Is there any solution to recover my data?

THanks

2

Hi, sorry to hear you cannot access your files, hard drive repairs are not supported but you can contact any of the data recovery partners on the WD support page, some of them can offer a free evaluation of your drive.

http://support.wdc.com/recovery/index.asp?wdc_lang=en

3

The SMOOTH chip controls the spindle motor and voice coil positioner, plus it also controls various onboard power supplies. The damage to your chip is on the side that controls the Vcore supply for the MCU plus the negative supply for the preamp.

I suspect that your drive sustained an overvoltage on the 5V input. To confirm whether this is the case, measure the resistances of the following components:

http://www.users.on.net/~fzabkar/HDD/bigcircuitboard_diodes.jpg

If your board has an 8-pin chip at location U12, then the most expedient solution would be to purchase a replacement PCB and transfer U12, or its contents, from patient to donor. The following PCB suppliers include such a service in the price:

http://www.onepcbsolution.com/
http://www.hdd-parts.com/

That said, there is a high probably that the preamp on the headstack inside the drive has been damaged, in which case you will need to engage professional services.

1 Like
4

First of all fzabkar it’s very nice to see you here !

Regarding the problem with this drive, i have one question :

With the new PCB does the drive spins and clicks or does it spins and sounds as trying to calibrate normaly without clicking and then it just doesn’t detect on BIOS ?

If the drive just clicks with the new PCB then most likely the pre-amp on the head stack or the heads themsefs are damaged and the drive must be opened on a hepa 100 clean room to have the head stack replaced for data recovery. This have to be done by a data recovery firm with the necessary tools and clean room.

If the drive sounds as normal then the problem is like already stated due to the fact that the drive have unique adaptives stored on the PCB ROM. Also the version of ROM on the donnor PCB might mismatch the version of perm ovl - Module 11 on the firmware stored on the platters.

If your drive have an external ROM chip you can just swap the ROM chip to the new donor PCB or if you are not good at soldering you might want to read the content of the chip with an external programmer like a willem and copy it over the new ROM chip like on this guide :

http://malthus.zapto.org/viewtopic.php?f=117&t=865

If your ROM is masked on the MCU (no rom chip on the PCB) you will need specialized tools to access the SA with “compatible” donnor PCB and get the necessary modules to re-create the original/compatible ROM (and ROM MODULES - Adaptives) and be able to make a pcb with a ROM code that will work for your drive.

Regards.

5

First, please confirm the donor PCB has the same board number as yours.

Then, you need to move your original PCB’s BIOS(Main Controllr IC) to the replacement PCB.

6

it doesnt make any sound when i replace the board.

7

Place a business card between the 20-pin HDA contacts and the PCB. If the drive then spins up, the preamp will be shorted.

8

i repaired the PCB. after i installed it, the hard drive still doenst spin. i tried it in another hard drive it spin.

what does that mean?