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 Post subject: Please help - WD10EAVS-00d7b1
PostPosted: March 11th, 2023, 23:31 
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Joined: March 11th, 2023, 23:23
Posts: 19
Location: America
Hi guys, I'm new, and I came here because I didn't know where else to turn.
I got a power surge and my hard drive died. I have ordered a new PCB to transplant, but I am scared that the ROM chip on my hard drive may have been the thing that died, and if that is the case then I don't know what to do about it. The hard drive is a WD Green Caviar 1TB, and the rom chip is a Marvell. I was wondering if anybody here could help me once the PCB arrives in 3 weeks. Thank you.


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 Post subject: Re: Please help - WD10EAVS-00d7b1
PostPosted: March 12th, 2023, 11:56 
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Location: Canada
Fazlinovic, U12 marking on PCB is typical where ROM chip is located, but it may be unpopulated on your board. I think the ROM is embedded in the MCU (Marvell) on your model. However, if U12 is populated it should be moved from the source PCB to the replacement.

If I was you, I would attempt to fix the source PCB otherwise you may need to take the drive to a DR company. ROM can be regenerated using tools like PC3000. It's also possible source ROM can still be read out from MCU in kernel mode or using term with special tools.

When you say "power surge and my hard drive died" what condition was the drive in after the surge? Can you upload a picture of the damaged PCB?

If damage is limited to PCB, data should be recoverable even if ROM is lost.


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 Post subject: Re: Please help - WD10EAVS-00d7b1
PostPosted: March 12th, 2023, 15:17 
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Joined: March 11th, 2023, 23:23
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Location: America
WebClaw, Thanks for the response, the power surge was me being an absolute idiot and plugging in 20W instead of the required 12.... the ROM is imbedded in the MCU chip, that is what I originally meant, and when I plug it into a hard drive reader, the light that indicates that the reader is working goes out. My concern is that if my marvell chip is broken, i wont be able to use the donor PCB to access it anyways.....


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 Post subject: Re: Please help - WD10EAVS-00d7b1
PostPosted: March 12th, 2023, 16:46 
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A photo would help a lot. IIUC, you plugged a 20V adaptor into a 12V external WD drive. Typically this causes the 12V TVS diode (D4) to go short circuit.

TVS Diode FAQ:
http://www.hddoracle.com/viewtopic.php?f=100&t=86

If the associated zero-ohm resistor goes open circuit, then this is what usually happens:

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

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 Post subject: Re: Please help - WD10EAVS-00d7b1
PostPosted: March 12th, 2023, 17:43 
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Joined: November 24th, 2011, 21:48
Posts: 103
Location: Canada
Hi Fazlinovic - not to sound like a broken record, but your case sounds like you'll need some tools which you may not have. If it's possible to isolate / remove damage from the PCB (see fzabkar's excellent writeup) so the MCU starts up a DR company can read the native ROM by jumpering your damaged PCB and the can write it to your donor PCB.

That said, it may be easier for a DR tech just to regenerate the ROM using a donor PCB and a loader. Assuming there is no other damage (eg: toasted preamp or encryption) a data recovery company in Canada would charge around in the range of $200 - $500 Canadian (maybe a bit cheaper if you're providing a working PCB they don't have for some reason). I am not aware of the price points in the USA.

Last point I'll make is that most DR labs don't "fix"; they'll get your drive up and running long enough to make a copy onto a new HDD (though I do understand your reason to attempt a self-repair).

Hope this helps!


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 Post subject: Re: Please help - WD10EAVS-00d7b1
PostPosted: March 12th, 2023, 17:49 
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The OP has made no mention of any visible damage. Therefore, it could be that R64 is intact, in which case the simple solution would be to snip the 12V TVS diode, and there would be no need to replace the PCB.

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Last edited by fzabkar on March 12th, 2023, 18:01, edited 1 time in total.

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 Post subject: Re: Please help - WD10EAVS-00d7b1
PostPosted: March 12th, 2023, 17:51 
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Joined: March 11th, 2023, 23:23
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Location: America
fzabkar, Here is a photo, the board seems fine to me, but if it wasn't a problem with the PCB then the drive would at least show up as active when plugged in..


Attachments:
0-02-01-20dcd278b9979b7aeef355684cc7087db085bf181668ebbf18c855e7ee2aa61c_24783149d59fb7ba.jpg
0-02-01-20dcd278b9979b7aeef355684cc7087db085bf181668ebbf18c855e7ee2aa61c_24783149d59fb7ba.jpg [ 113.17 KiB | Viewed 3879 times ]
0-02-01-81cb36e0dc374740257ad7207af95e2e3c9bbe781a4566b3b9af4f69e7db8386_8c27e913d6b7682a.jpg
0-02-01-81cb36e0dc374740257ad7207af95e2e3c9bbe781a4566b3b9af4f69e7db8386_8c27e913d6b7682a.jpg [ 179.18 KiB | Viewed 3879 times ]
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 Post subject: Re: Please help - WD10EAVS-00d7b1
PostPosted: March 12th, 2023, 17:52 
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Joined: March 11th, 2023, 23:23
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Location: America
WebClaw, I am in Canada, just wrote America as in NA.


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 Post subject: Re: Please help - WD10EAVS-00d7b1
PostPosted: March 12th, 2023, 17:54 
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WebClaw, Also, I am only looking to save the data.


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 Post subject: Re: Please help - WD10EAVS-00d7b1
PostPosted: March 12th, 2023, 17:59 
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Fazlinovic wrote:
fzabkarHere is a photo, the board seems fine to me, ...

Get hold of a multimeter, just like it says in my FAQ, and take some measurements. Or if you want to take a punt, snip diode D4. You will save both your drive and your data.

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 Post subject: Re: Please help - WD10EAVS-00d7b1
PostPosted: March 12th, 2023, 18:06 
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fzabkar, I am completely clueless over this, where is this diode, how do i snip it, how do i measure it?


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 Post subject: Re: Please help - WD10EAVS-00d7b1
PostPosted: March 12th, 2023, 18:10 
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Spildit, how do I do this? Is there any way that you or someone else could help me do this step by step?


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 Post subject: Re: Please help - WD10EAVS-00d7b1
PostPosted: March 12th, 2023, 18:11 
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I found something labeled D4 but there is an arrow underneath it and I dont know which diode it could be


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 Post subject: Re: Please help - WD10EAVS-00d7b1
PostPosted: March 12th, 2023, 18:16 
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This is a similar circuit:

http://www.hddoracle.com/download/file.php?id=1084&mode=view

The zero-ohm resistor is the thing with a "0" on it. The diode is the thing between the resistor and the SATA connector.

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 Post subject: Re: Please help - WD10EAVS-00d7b1
PostPosted: March 12th, 2023, 18:19 
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So I have located these things, could anyone point out what is what?


Attachments:
thing.png
thing.png [ 524.53 KiB | Viewed 3854 times ]


Last edited by Fazlinovic on March 12th, 2023, 18:19, edited 1 time in total.
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 Post subject: Re: Please help - WD10EAVS-00d7b1
PostPosted: March 12th, 2023, 18:19 
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Location: Australia
Fazlinovic wrote:
fzabkar, I am completely clueless over this, where is this diode, how do i snip it, how do i measure it?

Read my FAQ. Why do I bother?

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A backup a day keeps DR away.


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 Post subject: Re: Please help - WD10EAVS-00d7b1
PostPosted: March 12th, 2023, 18:42 
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fzabkar, Alright, I have done so. The only thing that concerns me is the physical act of snipping it. How is it done?


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 Post subject: Re: Please help - WD10EAVS-00d7b1
PostPosted: March 12th, 2023, 18:46 
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"just snip it with flush cutters or perhaps fingernail clippers"

https://m.media-amazon.com/images/I/71k0lXVu+YL._AC_UF894,1000_QL80_.jpg

Snip the metal pins close to the body of the diode, then remove the diode.

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 Post subject: Re: Please help - WD10EAVS-00d7b1
PostPosted: March 12th, 2023, 18:54 
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fzabkar, Lastly, is this a good voltmeter to buy? https://www.amazon.ca/AstroAI-Digital-M ... 01ISAMUA6/ I dont know if it has the required modes to get what I need.


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 Post subject: Re: Please help - WD10EAVS-00d7b1
PostPosted: March 12th, 2023, 19:19 
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Yes, that will do.

So will this:

https://www.amazon.ca/DT-830D-Multimeter-Continuity-Voltmeter-Ohmmeter/dp/B09RB2YLGS/

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