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 Post subject: WD23NMVW-11EDZS3 Liquid damage PCB
PostPosted: February 2nd, 2019, 16:32 
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Joined: March 19th, 2011, 18:47
Posts: 47
Location: The Netherlands
I have a dead WD23NMVW-11EDZS3, the type of 2.5" drives used in WD's externals with the on-PCB ASMedia USB to SATA bridges. Cause of death: water or other liquid got in and over time caused enough corrosion to make it fail electronically. Luckily, only one ceramic cap seems to be dead, the rest is minor surface traces and some via's that need bridging to recover the data; no corrosion near the spindle motor connection pads or the pogo pin interface to the head.

Before I start repairing the power circuits and then continue with the USB and SATA parts depending on what starts working, is there any internal ROM in the WD nautilus or the Marvell MCU? I suspect the motor driver won't have any/special code, but besides the serial flash SOIC8 connected to the Marvell (not the one connected to the ASMedia), might the Marvell MCU itself hold something unique for the drive? If the repair turns out to have damage to internal traces or via's this would obviously turn into a board swap, but knowing ahead of time of that's going to need a BGA reball for that Marvell chip or not would be good to know.


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 Post subject: Re: WD23NMVW-11EDZS3 Liquid damage PCB
PostPosted: February 2nd, 2019, 16:56 
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Joined: November 29th, 2006, 10:08
Posts: 7312
Location: UK
The SOIC at U12 should be all that’s unique.

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 Post subject: Re: WD23NMVW-11EDZS3 Liquid damage PCB
PostPosted: February 2nd, 2019, 16:57 
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Joined: March 19th, 2011, 18:47
Posts: 47
Location: The Netherlands
pcimage wrote:
The SOIC at U12 should be all that’s unique.

Thank you, I suspected as much. I'll dump that one before I repair the DC rails and power it on.


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 Post subject: Re: WD23NMVW-11EDZS3 Liquid damage PCB
PostPosted: February 3rd, 2019, 10:41 
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Joined: December 19th, 2006, 8:49
Posts: 10468
Location: Portugal
Don't even bother to repair the PCB.

Get the PCB number and buy another one from eBay with the exact same PCB number.

Write to that PCB the same ROM code of your damaged PCB. You can even write on circuit with SOIC 8 Clip.

DONE.

http://www.hddoracle.com/viewtopic.php?f=110&t=1738

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