Toshiba m2 died

[Gokhann]

I can't see any obvious overloads. Could it be that your USB port has shut down? These ports are usually protected by resettable polyswitches or polyfuses.

Many DR techs use a USB current/voltage monitor to measure the current draw of USB devices.

https://m.media-amazon.com/images/I/713ZajmsVyL._AC_UF894,1000_QL80_.jpg
https://m.media-amazon.com/images/I/71AwTaD37DL._AC_UF894,1000_QL80_.jpg

I do have one but its only pulling 86mA and thats what the enclosure pulls. I removed the hdd and ,it pulls 86.

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[fzabkar]

I'm confused. That would suggest that there is a poor connection between the enclosure and the SSD.

The only other thing I can think of is that the DevSleep pin on the m.2 interface is sitting at 3.3V, in which case the SSD would be in the sleep state. But that doesn't explain why your Intel SSD is still working ... or is it?

[Gokhann]

Here is a video of m2 is connected to usb wall adapter.

You can see the is trying to start, stop start

[Gokhann]

Oh video is not allowed.

After plugin enclosure with hdd in, to the usb wall adapter, i see current consumption is 0.31A. after few second, it drops down to 0.092A. and it just run in a loop.

[fzabkar]

I would be tempted to bridge Vin and Vout at the ZSA0 IC. That would eliminate this IC as a potential culprit, but you would then be reliant on the current limiting protection of your USB port.

The only other thing we haven't tested is the capacitor on the LDO output of the PMIC. You would need to refer to the datasheet to locate it.

[Gokhann]

I'm confused. That would suggest that there is a poor connection between the enclosure and the SSD.

The only other thing I can think of is that the DevSleep pin on the m.2 interface is sitting at 3.3V, in which case the SSD would be in the sleep state. But that doesn't explain why your Intel SSD is still working ... or is it?

You are not the only one who is confused.

Here is two pic.
One with "dead" m2
One with my second hdd, samsung evo..

As you see its working. I believe pin 38 is the devsleep , and its located on the bottom side, thats not possible for me to measure

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[Gokhann]

What do you want me to check?

no one is shorted.

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[fzabkar]

The capacitor on the A1 ball (top left corner) is the only thing left, AFAICT.

LDO = low dropout linear regulator

[fzabkar]

AIUI, the ZSA0 chip switches on when its ON pin rises above 1.1V.

The PMIC has a UVLO threshold of 2.7V and a hysteresis of 100mV. This means that it switches on when Vin rises above 2.7V and switches off when Vin drops below 2.6V. IIUC, Vin for the PMIC comes from the Vout pins of ZSA0.

The CBZ chip is a temperature sensor.

The SD and 6AGRVI (?) chips are a mystery to me.

[Gokhann]

The capacitor on the A1 ball (top left corner) is the only thing left, AFAICT.

LDO = low dropout linear regulator

Measures around 270Kohm compared to GND

[Gokhann]

Its annoying me alot that the usb cable that worked yesterday which came in the box of enclosure, doesnt work on the hdd today.

I have psu which i could inject a specific voltage on a specific pin, we need to be sure if that can be done safely or possible to get it work

[fzabkar]

Maybe you could bypass ZSA0 with a 500mA fuse or 1A fuse? Or you could inject 3.3V into the Vin/Vout pins of ZSA0 and set the current limit in your supply.

[Gokhann]

Maybe you could bypass ZSA0 with a 500mA fuse or 1A fuse? Or you could inject 3.3V into the Vin pins of ZSA0 and set the current limit in your supply.

I dont think i have any fuses, but i do have a external power supply, i can set it to 2.7V and set the current limit to 200mA on the output of Zsa?

[fzabkar]

I guess you could experiment with the UVLO and current limit. I don't know what else to try.

I'm puzzled about your defective (?) USB cables, though. Something weird is going on there ...

Edit: Start with a voltage of 2.5V and see if it is stable. This should prevent the PMIC from switching on. Then raise the voltage above the UVLO threshold and see what happens.

[Gokhann]

2.5V 10mA
2.6V 10mA
2.7V 10mA
2.8V 300mA which is the current limit i set

Monthing else happens. It gets hot on the same spot as yesterday

[fzabkar]

What voltages do you measure at the PMIC inductors?

I would increase the Vin supply to 3.3V and carefully increase the current limit while measuring the PMIC outputs. If you get to the stage where all the voltages are at their correct levels, then this would point to ZSA0.

Edit:

Could it be that the polyswitch at your USB host is heating up, going open circuit, and then taking some time to cool down and recover? This could make it appear that the cable is bad.

[fzabkar]

Supply Input Voltage Range : 2.9V to 5.5V

Six High Efficiency, Low Voltage Buck Converters

CH1 : 2.3V to 3V in 25mV step, Output 4A max.
CH2 : 0.9V to 1.6V in 25mV step, Output 1A max.
CH3 : 1.5V to 2.1V in 25mV step, Output 1A max.
CH4 : 0.7V to 1.3V in 25mV step, Output 2A max.
CH5 : 0.7V to 1.3V in 25mV step, Output 1A max.
CH6 : 0.7V to 1.3V in 25mV step, Output 3.5A max.

[Gokhann]

What voltages do you measure at the PMIC inductors?

I would increase the Vin supply to 3.3V and carefully increase the current limit while measuring the PMIC outputs. If you get to the stage where all the voltages are at their correct levels, then this would point to ZSA0.

Edit:

Could it be that the polyswitch at your USB host is heating up, going open circuit, and then taking some time to cool down and recover? This could make it appear that the cable is bad.

Well how do i test the poly circuit of mine usb port?

here i have injected 3.1V , at 100mA max.

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[fzabkar]

Channel 4 appears to be too high (3.06V).

CH4 : 0.7V to 1.3V

I would measure the resistance between ZSA0-Vout and PMIC_CH4_out. If this resistance is low, then this could mean that the internal MOSFET switch of the PMIC is shorted on that channel.

Since the voltage range maxes out at 1.3V, this would suggest that CH4 is a Vcore supply. This in turn would suggest that both the controller and PMIC are damaged.

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PMIC_CH4_MOSFET_punch-through.gif (10.44 KiB) Viewed 48575 times

Last edited by fzabkar on January 2nd, 2024, 16:49, edited 1 time in total.

[Gokhann]

Channel 4 appears to be too high (3.06V).

CH4 : 0.7V to 1.3V

I would measure the resistance between ZSA0-Vout and PMIC_CH4_out. If this resistance is low, then this could mean that the internal MOSFET switch of the PMIC is shorted on that channel.

Measures around 4-500 Kohm