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 Post subject: SanDisk SD5SE 128G 1002E inductance issue?
PostPosted: January 29th, 2017, 13:28 
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Joined: January 29th, 2017, 13:17
Posts: 7
Location: Paris
Hello all,

I have in my hand a XU51VZ from Asus.
SSD are quite specific. Ref.: SD5SE2-128G-1002E.

Asus put two of these drives in RAID 0 (nice move...) and one of them is not recognizable anymore by the SATA controller.
I tried them on two computers.

After looking for physical damage, I have found a damanged inductance. (see picture, sorry phone camera)

https://postimg.org/image/lrcki5box/

I tested resistance between inductance pads and it's 0ohm (or very close to).
However could it be the reason the drive is not detectable?
Anyone experienced the same "not detectable" issue?

Anyone has the specs of this inductance?

Thinking about reflowing the SSD? What do you think? Should I remove the black epoxy around controller (which is very hard) before doing so?
Can I buy the same SSD and move NAND (I have PCB rework station)? Or encryption will create problems?

Thanks in advance!

Regards,

Francois


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 Post subject: Re: SanDisk SD5SE 128G 1002E inductance issue?
PostPosted: January 30th, 2017, 15:51 
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Joined: September 8th, 2009, 18:21
Posts: 9513
Location: Australia
The damage doesn't look significant. If you can upload detailed photos of both sides of the PCB, I'll try to identify the voltage test points for you.

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 Post subject: Re: SanDisk SD5SE 128G 1002E inductance issue?
PostPosted: January 31st, 2017, 16:36 
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Joined: January 29th, 2017, 13:17
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Location: Paris
Here you go!
https://postimg.org/image/im8okp7zh/

Thank you very much.
Think the controller could be dead?

fzabkar wrote:
The damage doesn't look significant. If you can upload detailed photos of both sides of the PCB, I'll try to identify the voltage test points for you.


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 Post subject: Re: SanDisk SD5SE 128G 1002E inductance issue?
PostPosted: February 1st, 2017, 3:29 
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Joined: September 8th, 2009, 18:21
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Location: Australia
Your second photo was worse than the first. :-(

Could you measure the voltages at V1 and V2 (across each capacitor)?

Could you also identify the markings on the ICs (U13, U7, ICx, ICy and the buck regulators)?

Are any of the chips getting too hot?

As for your other question, I'm not a data recovery professional, but AIUI the most common failure in flash based storage devices is corruption of firmware structures (eg Flash Translation Layer) or excessive bit errors in the NAND array.


Attachments:
ICs.jpg
ICs.jpg [ 102.81 KiB | Viewed 1156 times ]

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 Post subject: Re: SanDisk SD5SE 128G 1002E inductance issue?
PostPosted: February 1st, 2017, 3:46 
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Joined: January 29th, 2017, 13:17
Posts: 7
Location: Paris
Looking for short to ground?

I'll check tonight (UTC+1) as the drive is at home.
And I'll compare with the other one.

Thanks.

fzabkar wrote:
Your second photo was worse than the first. :-(

Could you measure the voltages at V1 and V2 (across each capacitor)?

Could you also identify the markings on the ICs (U13, U7, ICx, ICy and the buck regulators)?

Are any of the chips getting too hot?

As for your other question, I'm not a data recovery professional, but AIUI the most common failure in flash based storage devices is corruption of firmware structures (eg Flash Translation Layer) or excessive bit errors in the NAND array.


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 Post subject: Re: SanDisk SD5SE 128G 1002E inductance issue?
PostPosted: February 1st, 2017, 3:54 
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fcoulloudon wrote:
Looking for short to ground?

Yes, among other things. My first approach is to verify the onboard power supplies. To this end it usually helps to identify the ICs.

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 Post subject: Re: SanDisk SD5SE 128G 1002E inductance issue?
PostPosted: February 1st, 2017, 17:10 
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Joined: January 29th, 2017, 13:17
Posts: 7
Location: Paris
Bad news, compared both SSDs and the voltages look similar.
All voltages seem to be good. I checked most of the big caps and they all have plausible voltage (3.3V or 1.8v for ex.)

Regarding V1 and V2:
V1 1.06v
V2 1.81v
on both SSDs (the working one and the other)

Better picture:
https://postimg.org/image/txlopvymh/

fzabkar wrote:
fcoulloudon wrote:
Looking for short to ground?

Yes, among other things. My first approach is to verify the onboard power supplies. To this end it usually helps to identify the ICs.


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 Post subject: Re: SanDisk SD5SE 128G 1002E inductance issue?
PostPosted: February 2nd, 2017, 17:59 
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V1 looks like the Vcore supply for the controller.

V2 could be the 1.8V supply for the SDRAM and NAND flash, and maybe Vio for the controller.

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 Post subject: Re: SanDisk SD5SE 128G 1002E inductance issue?
PostPosted: February 4th, 2017, 11:57 
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Joined: January 29th, 2017, 13:17
Posts: 7
Location: Paris
fzabkar wrote:
V1 looks like the Vcore supply for the controller.

V2 could be the 1.8V supply for the SDRAM and NAND flash, and maybe Vio for the controller.


Any idea on what to do?
Reflow?
Possible to change controller or you think it's not possible?

Anyone has an idea? :-)

Thank you!


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 Post subject: Re: SanDisk SD5SE 128G 1002E inductance issue?
PostPosted: February 4th, 2017, 12:36 
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Joined: January 8th, 2008, 5:21
Posts: 799
Location: uk
Hi. It's a long shot but you could scope the crystal oscillator or even swap it with the known working crystal from the other unit. Make sure you have a backup before just in case!

Also on the big auction site you can buy a cheap convertor to sata interface which might come in handy.


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 Post subject: Re: SanDisk SD5SE 128G 1002E inductance issue?
PostPosted: February 4th, 2017, 17:36 
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Joined: January 29th, 2017, 13:17
Posts: 7
Location: Paris
Thanks.

Will check OSC

Already have SATA adapters.


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 Post subject: Re: SanDisk SD5SE 128G 1002E inductance issue?
PostPosted: February 4th, 2017, 17:51 
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Joined: January 29th, 2017, 13:17
Posts: 7
Location: Paris
dick wrote:
Hi. It's a long shot but you could scope the crystal oscillator or even swap it with the known working crystal from the other unit. Make sure you have a backup before just in case!

Also on the big auction site you can buy a cheap convertor to sata interface which might come in handy.


But even with dead OSC, the drive would be visible right?

Its impossible to change the controller right?


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