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Dead SK hynix NVMe - Any chance of saving?
http://forum.hddguru.com/viewtopic.php?f=10&t=44211		 Page 1 of 1
Author:  barchie [ April 3rd, 2024, 0:17 ]
Post subject:  Dead SK hynix NVMe - Any chance of saving?
Hey People - Wondering if any one here can assist.

I recently had a SK hynix die on me during a backup and now i cannot get it to register. I have limited knowledge of electronics, although i have worked in IT for a very long time. I caught this post (https://forum.hddguru.com/viewtopic.php?t=37039) where fzabkar goes through solving the issue.

I'm wondering if anyone in this forum (or fzabkar?) could guide me through trying to identify if there has been an electronic failure on the drive (do you even still call it that).

I would of course consider taking it to a data recovery expert, but from what i can see the upfront costs and the lack of support for SK Hynix on the most common tools suggests that ill get charged upfront with a small likeliness of success.

If anyone could point me in the right direction for how to identify the cause and resolve it would be greatly appreciated!

Thanks in advance!

Attachments:
File comment: SK Hynix - Label
SK Hynix Lable.jpg
SK Hynix Lable.jpg [ 74.91 KiB | Viewed 5534 times ]
File comment: SK Hynix - Front
SK Hynix - Front.jpg
SK Hynix - Front.jpg [ 106.24 KiB | Viewed 5534 times ]
File comment: SK Hynix - Back
SK Hynix - Back.jpg
SK Hynix - Back.jpg [ 132.74 KiB | Viewed 5534 times ]
Author:  fzabkar [ April 3rd, 2024, 3:36 ]
Post subject:  Re: Dead SK hynix NVMe - Any chance of saving?
That other thread identifies the 4 voltage test points around the SM6741 IC and the single test point at the SLO IC. Your SSD has the same two ICs, so start by measuring those voltages.
Author:  fzabkar [ April 3rd, 2024, 13:02 ]
Post subject:  Re: Dead SK hynix NVMe - Any chance of saving?
These are the test points (V1 - V5).

The D0, D1 and GND pins appear to be a diagnostic port. You could connect an RS232 TTL-USB adaptor to these pads. The GND pad can be your 0V reference for your Vn voltage measurements.

Investigation of SK Hynix SSD (SH88800AA controller):

https://www.hddoracle.com/viewtopic.php?p=23365#p23365

Attachments:
terminal.jpg
terminal.jpg [ 18.11 KiB | Viewed 5437 times ]
reg1.jpg
reg1.jpg [ 41.44 KiB | Viewed 5437 times ]
reg2.jpg
reg2.jpg [ 97.66 KiB | Viewed 5437 times ]
Author:  sourcerer [ April 3rd, 2024, 18:45 ]
Post subject:  Re: Dead SK hynix NVMe - Any chance of saving?
To me it looks like DO and DI, not D0 and D1. Which would be DATA-OUT and DATA-IN, which sounds like a UART to me.
Author:  barchie [ April 15th, 2024, 0:03 ]
Post subject:  Re: Dead SK hynix NVMe - Any chance of saving?
Oki Doki - Apoloiges for the delayed response, but i needed some help to test this stuff. Here is what i have:

-No voltage on any inductors

Put some power through pins 74,72,70 and tried to trace through the board - i believe there could be a dead TVS diode (The one marked in red - TVS?)

I get continuity from power pins to one side of the diode, and i can get continuity from the other side of the diode to the sms6741 pins indicated in the image, but nothing across the diode. Is this normal? Am i correct to think that the diode is dead and to replace?

Also, if it sounds like i have no idea what im talking about - its because i'm really a bit out of my depth so the more information you could provide the better. Thanks a heap, really appreciate it!!

Attachments:
File comment: Dead TVS diode?
Dead Diode.jpg
Dead Diode.jpg [ 267.73 KiB | Viewed 5170 times ]
File comment: Pins traced from diode to sms6741
SM6741 pins.jpg
SM6741 pins.jpg [ 539.16 KiB | Viewed 5170 times ]
Author:  fzabkar [ April 15th, 2024, 2:06 ]
Post subject:  Re: Dead SK hynix NVMe - Any chance of saving?
Can you measure the voltages on the Vin and En pins of the SLO chip?

TLV62084, Texas Instruments, marking SLO, 2A High Efficient Step Down Converter, 2x2mm WSON, 8-pin, 2.7 - 6V Input:
http://www.ti.com/lit/gpn/TLV62080

Attachments:
TLV62084_SLO_pinout.png
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