05-15-2012 09:45 PM - last edited on 05-16-2012 07:33 AM by jubei04
I have a client with a WD15EACS-11BHUB0 with what appears to be a failed controller board. After searching the forum, I found several posts that suggest removing the TVS diode or moving the chip at U12 to a donor contoller board may allow for data retrieval. I have attached pictures of the failed drive and a donor drive I have obtained. I have looked at the failed board and am unsure of which component is the TVS diode. If possible, could someone please point out the component that needs to be removed as well as any tips on how to remove it? If this method does not work, could you please verify that the donor contoller board is a suitable match to move the chip with the DCM to? Any other suggestions would be greatly appreciated as well. Please note, I have experience with soldering (replacing capacitors, DC jacks, etc.), but have never worked with surface level components. Thank you in advance.
Failed Controller Board
Failed Controller Board 2
Donor Controller Board
05-16-2012 07:40 AM
For replacement board knowledge I recommend you to PM fzabkar.
05-17-2012 12:51 AM
05-17-2012 02:38 PM
After removing the diodes at D3 and D4 will I need to bridge the contact points? Or do I just need to remove them? I appreciate your help!
05-18-2012 06:04 PM
05-21-2012 11:02 AM
Its not as simple as moving U12 flash rom chip over from failed board to donor (like it would be on some WD boards with external rom). You can see that U12 position on failed board has no chip, that is because adaptive data is embedded into Marvel controller, and is not external. If removing diodes does not solve the problem, there is an option of manual reconstruction of adaptive data from firmware on the disk.
05-21-2012 04:18 PM
05-21-2012 04:28 PM
HDDRS, look again. :-)
As for manual reconstruction, there are software tools costing less than US$150 that will do this with a single click.
Otherwise the following supplier offers a free PCB "adaptation" service:
oops. I have no clue how it apeared to be missing to me. Indeed with a U12 chip present this is a walk in the park.