T7 try to recover it

[tcccorp]

hello,

I have a T7 and when I try to use it, it fails

so I decided to open it !

please find enclosed PCB picture . there are a line A ( 7 pins) , a line B ( 5 pins) on the right and 2 pins on the left.



I took value from GND to a pin :

A1 - GND
A2 - 2.3V
A3 - 3.28V
A4 - 0
A5 - 3.28V
A6 - 0
A7 - 0

A8 - 3.28V
A9 - 3.28V

B1 - 0
B2 - 3.28V
B3 - 2.3V
B4 - 1.8V

B line looks to be voltage part

i tried to short pin A6 and A7 during boot. After that, I used a jtagulator to find a JTAG or uart port with without success maybe it is an issue with the controller

do you know if safe mode pins are on the A8/A9 ? if someone has pinout for this ssd, I'll be happy to test !

KR

Attachments

Capture d'écran 2025-01-02 101425.png (348.36 KiB) Viewed 9285 times

[Arch Stanton]

maybe it is an issue with the controller

Most of the times it's not that.

I have a T7 and when I try to use it, it fails

Is utterly non descriptive and non informative.

[sourcerer]

This looks strange, could it be shorted? You can safely remove it and make sure that it doesn't short anymore, there are enough capacitors nearby

Attachments

SamsungPhoto.png (302.22 KiB) Viewed 9228 times

[fzabkar]

Measure the voltages at V1 - V5.

Can you tell us the markings on "ICx"?

Also check for shorts at the ESD protection diodes:

https://www.hddoracle.com/viewtopic.php?f=100&t=1615&p=24636#p24636


TPS62085, Texas Instruments, adjustable 3A Step-Down Converter with DCS-Control and Hiccup Short Circuit Protection, 2x2 HotRod Package, marking PD5Q, 7-pin:
https://www.ti.com/lit/ds/symlink/tps62085.pdf

Attachments

[fzabkar]

This looks strange, could it be shorted? You can safely remove it and make sure that it doesn't short anymore, there are enough capacitors nearby

Its marking is "05b" and it is in parallel with the capacitor array.

This is one possibility:

PESD5V0S1BA-N, ESD Protection Diode, 350W, 5V, bidirectional, marking 05B, SOD323:
https://xonstorage.blob.core.windows.net/pdf/bourne_pesd5v0s1ban_apr22_xonlink.pdf

[fzabkar]

I think ICx is an e-fuse. Compare the Vin and Vout voltages.

TPS259535DSG, Texas Instruments, 2.7V - 18V, 4A, 34mOhm eFuse With Fast Overvoltage Protection, 5.7V clamp, Auto-retry, marking ES35, WSON-8:

https://www.ti.com/lit/gpn/tps2595

[tcccorp]

hello all,

thanks for your replies and your help

@Arch Stanton

you are right, more information below

- on Windows, there is a new entry on the management disk but a message " no media "

- on Linux ( When I try to access to /dev/sda, there is an error message who says there is no media)
[933052.033318] usb 7-1: new SuperSpeed Plus Gen 2x1 USB device number 5 using xhci_hcd
[933052.045643] usb 7-1: New USB device found, idVendor=04e8, idProduct=4001, bcdDevice= 1.00
[933052.045663] usb 7-1: New USB device strings: Mfr=2, Product=3, SerialNumber=1
[933052.045670] usb 7-1: Product: PSSD T7
[933052.045677] usb 7-1: Manufacturer: Samsung
[933052.045683] usb 7-1: SerialNumber: 00000Sxxxxxx
[933052.046186] usb 7-1: Device is not authorized for usage
[933052.051914] scsi host0: uas
[933052.052328] usb 7-1: authorized to connect
[933056.743328] scsi 0:0:0:0: Direct-Access Samsung PSSD T7 0 PQ: 0 ANSI: 6
[933056.745460] sd 0:0:0:0: Attached scsi generic sg0 type 0
[933056.745615] sd 0:0:0:0: [sda] Media removed, stopped polling
[933056.746543] sd 0:0:0:0: [sda] Attached SCSI removable disk

@fzabkar

please find below values from V1 to V5

V1 : 3.28
V2 : 2.53
V3 : 1.04
V4 : 1.81
V5 : 0.89

ICx looks to be a ES35 188 A3RL but I didn't find the datasheet. Btw i took voltage on pin 4 (Vin?) et 5 (Vout) and both are 5.1 V


@sourcerer

I ll test later, I don't have my clamp with me to do that

thanks again

[fzabkar]

@fzabkar

please find below values from V1 to V5

V1 : 3.28
V2 : 2.53
V3 : 1.04
V4 : 1.81
V5 : 0.89

ICx looks to be a ES35 188 A3RL but I didn't find the datasheet. Btw i took voltage on pin 4 (Vin?) et 5 (Vout) and both are 5.1 V


@sourcerer

I ll test later, I don't have my clamp with me to do that :)

thanks again :)

Those voltages match up with these:

https://www.zeroalpha.com.au/services/data-recovery-blog/ssd/samsung-portable-ssd-t7-shield-1tb-data-recovery

https://www.zeroalpha.com.au/images/BRANDS/samsung/samsung-t7-shield-1tb-pcb-voltages-schematic.jpg

There is no need for you to look for a datasheet for ES35. I found it in my previous post.

There is no need to remove "05b". Just measure the voltage across it.

The following ID info appears to be coming from the bridge firmware:

Code:

[933052.033318] usb 7-1: new SuperSpeed Plus Gen 2x1 USB device number 5 using xhci_hcd
[933052.045643] usb 7-1: New USB device found, idVendor=04e8, idProduct=4001, bcdDevice= 1.00
[933052.045663] usb 7-1: New USB device strings: Mfr=2, Product=3, SerialNumber=1
[933052.045670] usb 7-1: Product: PSSD T7
[933052.045677] usb 7-1: Manufacturer: Samsung
[933052.045683] usb 7-1: SerialNumber: 00000Sxxxxxx

[tcccorp]

Thanks fzabkar,

does it mean everything is OK ? do you know what I can do to debug my issue or retrieve my data ?

[fzabkar]

It appears that there is a firmware problem.

I'm guessing that A8/A9 could be a UART port.

[tcccorp]

hello

Thanks again for your answer

I tested to find an UART but without success ( I tried with 'safe mode' and without, I'm NOT sure if it is A5 and A6) . if it's an issue with the firmware, maybe it is normal

I dumped flash on the top left. It's a very small one ( only 1Mb and half is empty) . It seems it's not an ARM firmware beacause header look different as we can find on another equipment . After check, SPI pins are connected to the PCI ExpresS to USB bridge

I don't know if I can do something else ie find jyag/swd, ...

Attachments

Capture d'écran 2025-01-05 194534.png (9.75 KiB) Viewed 8814 times

[fzabkar]

Can you upload the SPI flash dump? I'm just curious.

This firmware is used by the bridge. It has no connection to the SSD behind the bridge. The SSD has its own firmware.

[tcccorp]

Of course I can

Is there a way to dump the SSD firmware ?

Attachments

t7.zip

(24.47 KiB) Downloaded 143 times

[fzabkar]

I don't know about the SSD firmware.

Currently there is no support for your controller in Ace Lab's tools:

https://blog.acelaboratory.com/pc-3000-ssd-list-of-supported-ssd-drives-regularly-updated.html

[fzabkar]

I don't know if I can do something else ie find jyag/swd, ...

@sourcerer has done a lot of JTAG-ing on an 840 Evo.

[tcccorp]

Hello,

I bought a evo 840 and I'll spend my week end on it