Samsung T7 no power

[gameboybin]

I have this T7 Samsung SSD. Upon plugging it in. It gives no power at all. What could the problem be?

I have checked all 5V shown like in this post
https://forum.hddguru.com/viewtopic.php?f=10&t=44979&p=314135&hilit=samsung+t7#p314135

all of them shows 0.0V

Maybe it is Type C connector or the Asmedia chip?

On type C pins all shows 0 as well, so no power goes through type C i think.

LED light not flashing or anything

Attachments

z7562896981900_bb5d003a86dba4a34d4990e682047d25.jpg (22.24 KiB) Viewed 1070 times

[fzabkar]

Check the input and output of ES35.

TPS259535, Texas Instruments, 2.7V - 18 V, 4A, 34-mΩ eFuse With Fast Overvoltage Protection, 5.7V clamp, marking ES35, WSON-8:
https://www.ti.com/lit/gpn/tps2595

[gameboybin]

Check the input and output of ES35.

TPS259535, Texas Instruments, 2.7V - 18 V, 4A, 34-mΩ eFuse With Fast Overvoltage Protection, 5.7V clamp, marking ES35, WSON-8:
https://www.ti.com/lit/gpn/tps2595

The drive today upon turning on did turn on for a split second then turned off
Here is the heat signature of the drive at that exact moment

IRI_20260225_185018.jpg (253.2 KiB) Viewed 1011 times

VIS_20260225_185018.jpg (57.2 KiB) Viewed 1011 times

here is what i got on in out of ES35

[SWM]

Check the input and output of ES35.

TPS259535, Texas Instruments, 2.7V - 18 V, 4A, 34-mΩ eFuse With Fast Overvoltage Protection, 5.7V clamp, marking ES35, WSON-8:
https://www.ti.com/lit/gpn/tps2595

If you read this and compare it with the measurements - ES35 is dead.
(5.1-2.2)/0.034 = 85,3A!

[fzabkar]

The five "PD5Q" buck regulators have an undervoltage lockout threshold (VUVLO) of 2.2V. I'm wondering whether one of the loads is drawing too much current and causing the ES25 e-fuse to enter current limiting mode. VUVLO would be the equilibrium point. Above this point, the PD5Q ICs start to draw current. Below this point, those ICs switch off.

I would measure the resistance between pin#5 of ES35 and Ground. I would also measure the resistances between Ground and each of the PD5Q outputs.

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

[SWM]

Frank is the smartest. I didn't see that some indexes can "In this case, the device either stays latched-off or starts an auto retry cycle as explained in the Overtemperature Protection (OTP) section"...

[gameboybin]

The five "PD5Q" buck regulators have an undervoltage lockout threshold (VUVLO) of 2.2V. I'm wondering whether one of the loads is drawing too much current and causing the ES25 e-fuse to enter current limiting mode. VUVLO would be the equilibrium point. Above this point, the PD5Q ICs start to draw current. Below this point, those ICs switch off.

I would measure the resistance between pin#5 of ES35 and Ground. I would also measure the resistances between Ground and each of the PD5Q outputs.

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

Here are the resistances

[fzabkar]

I don't understand how you can be seeing 0 ohms at ES35, but it appears that the top left PD5Q converter has a shorted load. Hopefully this is due to a shorted capacitor rather than a major IC.

[gameboybin]

So the problem was the ES35 chip. I swapped it out. And the drive powered on

[fzabkar]

Why were you measuring 0 ohms at the output of the 3.3V regulator? And how is it possible to measure 2.2V at the output of ES35 when the resistance is 0 ohm?

[Hardcore Games]

So the problem was the ES35 chip. I swapped it out. And the drive powered on

I presume the T7 is now accessible.

[gameboybin]

Why were you measuring 0 ohms at the output of the 3.3V regulator? And how is it possible to measure 2.2V at the output of ES35 when the resistance is 0 ohm?

So it must be somekind of locking mechanism when power is not stable or something.

After changing the es35. The resistance only came back to es35. All pd5q still off. After 3-4 times plugging and unplugging the drive. Each pd5q came back to normall and the whole drive worked like a charm

[gameboybin]

So the problem was the ES35 chip. I swapped it out. And the drive powered on

I presume the T7 is now accessible.

Yes. Fully functional. It does have some hiccups when mapping the data out though. But i managed to map the whole drive

[fzabkar]

After changing the es35. The resistance only came back to es35. All pd5q still off. After 3-4 times plugging and unplugging the drive. Each pd5q came back to normall and the whole drive worked like a charm

I wonder whether there really was anything wrong with ES35. Instead, it could be that there was a shorted capacitor at the output of the PD5Q 3.3V regulator. Repeated plugging and unplugging may have blown open the short.

[Hardcore Games]

I have not run across many fried ES35 chips suggesting they are reasonably reliable. I make redundant copies of data as I assume storage is flakey at best.

One of my old Samsung MZVLB256HAHQ-000L2 is down to 87% with 3949GB written. I now use this old SSD for general backup storage.