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 Post subject: Hynix NVME SSD dead
PostPosted: July 4th, 2018, 13:24 
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Completely Dead Hynix NVME SSD. I used DDI SSD add on but no joy getting an id of the drive. Might be that minor components failed. Not sure how to proceed from here. Any input would be great were to get started. High res. scan attached
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Hynix SSD.jpg
Hynix SSD.jpg [ 3.28 MiB | Viewed 1290 times ]


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 Post subject: Re: Hynix NVME SSD dead
PostPosted: July 4th, 2018, 18:19 
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I would measure V1-V5 and the voltage across the TVS diode.


MCP9844T-BE/MNY, Microchip, +/-1 degC, 1.8V Digital Temperature Sensor, marking ABS, TDFN-8:
http://ww1.microchip.com/downloads/en/DeviceDoc/20005192B.pdf

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
http://www.ti.com/lit/ds/symlink/tlv62080.pdf


Attachments:
regs.jpg
regs.jpg [ 389.13 KiB | Viewed 1260 times ]
TVS.jpg
TVS.jpg [ 40.11 KiB | Viewed 1260 times ]

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 Post subject: Re: Hynix NVME SSD dead
PostPosted: July 4th, 2018, 20:13 
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I haven't been able to find a datasheet for the SM6741 PMIC, but the SM6742 appears to be similar.

SM6742, Silicon Mitus, PMIC, 4 x bucks, 1 x boost converter, 3 x power pass switches, I2C programmable, 2.6V - 3.6V in, QFN-40:
http://www.siliconmitus.com/main/products_view01.asp?intSeq=4&p_intSeq=23&c_intSeq=33


Attachments:
SM6742_block_diag.gif
SM6742_block_diag.gif [ 87.77 KiB | Viewed 1246 times ]

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 Post subject: Re: Hynix NVME SSD dead
PostPosted: July 5th, 2018, 0:38 
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The PIC microcontroller appears to control the SM6741 IC.

PIC16LF721, Microchip, microcontroller, 16MHz, 1.8V - 3.6V, 4K x 14 words (7KB) flash memory, QFN-20:
http://ww1.microchip.com/downloads/en/DeviceDoc/40001430F.pdf

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 Post subject: Re: Hynix NVME SSD dead
PostPosted: July 5th, 2018, 2:58 
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I attached a picture of all the measurements take


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 Post subject: Re: Hynix NVME SSD dead
PostPosted: July 5th, 2018, 5:15 
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I'm a little confused by the 3.3V measurement at V1. Are you saying that there is 3.3V at one end of the inductor and 0.7V at the other end? If so, then the inductor must be open circuit. If instead you mean that pin #8 (Vin) of the "SLO" chip is +3.3V, then that would be as expected. However, Vout = 0.7V does seem a little low ??

Also, the EN-able pin (#1) just barely exceeds the minimum VIH spec of 1V. Therefore ISTM that this pin is not receiving the correct voltage. Can you measure any continuity between pin #1 and the V5 or V3 inductors? If not, would you be able to determine the source of the EN signal? Could it be coming from the PIC micro?

Could you measure the voltage at pin #4 (FB) of the SLO chip? It should be 0.45V.

Pin #6 is the Power Good pin. It's not clear whether this pin is connected. If it is connected, then PG should be high if Vout is good, or low if Vout is below spec.


Attachments:
TLV62084_pinout_defs.gif
TLV62084_pinout_defs.gif [ 66.67 KiB | Viewed 1181 times ]
TLV62084_block_diag.gif
TLV62084_block_diag.gif [ 46.31 KiB | Viewed 1181 times ]
TLV62084_specs.gif
TLV62084_specs.gif [ 47.8 KiB | Viewed 1181 times ]

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 Post subject: Re: Hynix NVME SSD dead
PostPosted: July 5th, 2018, 5:27 
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Well quick update. SSD is now showing in DDI PCIe add on and I am able to image it. Drive is in very bad shape and stalls every 3 min but data is coming off. The 0.7 confused me a bit as well but it seems to be working now. For all on here throwing in advise I am very thankful. I would like to better understand the components can anybody recommend a book or resource for ssd drives. Happy to learn but not sure where to start.


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 Post subject: Re: Hynix NVME SSD dead
PostPosted: July 5th, 2018, 5:28 
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Also it seems this one is bit locker encrypted and wasn't mentioned.


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 Post subject: Re: Hynix NVME SSD dead
PostPosted: July 5th, 2018, 7:02 
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In the interests of "better understanding", it may be instructive to measure those voltages again after the recovery is complete. There may be an electrical reason why imaging is slow.

As for books, I'm not aware of any of the type you are asking for. Sorry.

You might like to read the following articles.

Tutorial - Linear and Switchmode Regulators used in HDDs (and SSDs):
http://www.hddoracle.com/viewtopic.php?f=59&t=231

PCB protection devices:
http://www.hddoracle.com/viewtopic.php?f=100&t=1615

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 Post subject: Re: Hynix NVME SSD dead
PostPosted: July 5th, 2018, 8:11 
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No imaging is spot on at 150mb/s but cuts out every 3min with bad blocks. 500Gb imaged with less than 0.2% not readable. I am happy with that. Still not sure what happened to the drive, controller got quite hot around 50 degrees but not over heating.


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 Post subject: Re: Hynix NVME SSD dead
PostPosted: July 5th, 2018, 18:14 
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nicoalbrecht wrote:
No imaging is spot on at 150mb/s but cuts out every 3min with bad blocks. 500Gb imaged with less than 0.2% not readable. I am happy with that. Still not sure what happened to the drive, controller got quite hot around 50 degrees but not over heating.

I'd still be interested in the voltage readings for the "SLO" IC. I'm wondering if there is something special about the LAMD/hynix controllers.

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 Post subject: Re: Hynix NVME SSD dead
PostPosted: July 6th, 2018, 4:08 
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I will do that shortly and update the values. To be fair it is the first Hynix I got in. Can you use the pictures above and mark the points you would like to get measured? Happy to do that.


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 Post subject: Re: Hynix NVME SSD dead
PostPosted: July 6th, 2018, 15:38 
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Thanks. I would be grateful for the voltages at each of the 8 pins of the SLO chip. Can you also confirm your previous readings at V1-V5?

ISTM that 1.1V might be expected for the two (?) Vcore supplies, while 1.2V could be the SDRAM supply, and 1.8V would be for the NANDs. But 0.7V is an odd one. :? :?

FWIW, I notice that SK hynix SSDs are used in Microsoft's Surface Pro 2 and 3 products. The controller in those cases is a Link A Media LM87800AA. Link_A_Media was acquired by SK hynix and is now known as "SK hynix memory solutions".

Therefore I would expect that your SSD's SH88800AA controller is probably an LAMD part.

Review SSD SK hynix CANVAS SC300A 128GB:
http://webcache.googleusercontent.com/search?strip=1&q=cache:www.hw4all.com/review-ssd-sk-hynix-canvas-sc300a-128gb/

Quote:
As discussed earlier SK hynix CANVAS SL308 as a controller chip acts SK hynix SH87820BB, which is a re-mark model Link A Media (LAMD) LM87800AA. In this case, the controller uses SK hynix SH87810AA, which includes two ARM Cortex-R4 cores operating at a frequency of 333 MHz.

Just for completeness, the TVS diode is a 3.3V part.

ESD5Z3.3T1G, On Semiconductor, 3.3V, 240W, unidirectional TVS diode, marking ZE, SOD523:
https://www.onsemi.com/pub/Collateral/ESD5Z2.5T1-D.PDF
https://www.comkey.in/sites/default/files/attachments/ESD5Z3.3T1G.pdf

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