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Dead SDSSDA-240G - Wrong modular PSU cable
http://forum.hddguru.com/viewtopic.php?f=10&t=40522		 Page 1 of 1
Author:  nelly [ October 24th, 2020, 5:56 ]
Post subject:  Dead SDSSDA-240G - Wrong modular PSU cable
Hi

I have a Samsung 240 SSD drive which has been plugged into the wrong modular power supply cable (Corsair MODULAR cable in an Antec modular PSU). I am keen if at all possible to access this drive.

As a result of the wrong cable type the drive (and also my WD RED RAID array) is not recognised by any PC in the bios, I have tried a couple of different PC's.

I have inspected the board closely and cannot see any visible signs of damage, however I suspect the internal damage could be significant?

a couple of components I have checked;

there is ZD7 on reverse of the board which is "open circuit" in both directions with fluke set to diode.
there is K24 which is open circuit in one direction and 0.187ohm

is there any examples of this device being saved with simple steps from a similar experience or is it toast? i will try to upload pictures

thanks
Author:  nelly [ October 24th, 2020, 7:38 ]
Post subject:  Re: Dead SDSSDA-240G - Wrong modular PSU cable
please see pictures

Attachments:
IMG_20201024_094228.jpg
IMG_20201024_094228.jpg [ 3.3 MiB | Viewed 10282 times ]
IMG_20201023_214952.jpg
IMG_20201023_214952.jpg [ 4.08 MiB | Viewed 10282 times ]
Author:  fzabkar [ October 24th, 2020, 14:29 ]
Post subject:  Re: Dead SDSSDA-240G - Wrong modular PSU cable
"K24" appears to be a 5V TVS diode. Usually these go short circuit when hit by a prolonged overvoltage.

I suspect that IC2 ("V092") may have been clobbered. This could be an LM10524 Triple Buck Power Management IC which has been preconfigured for the SM2246XT controller.

I would measure the resistances between ground and each of the L1, L2 and L3 inductors. I would also measure the resistances between +5V and each inductor. This will tell us whether the damage is confined to the PMIC, or if the overvoltage has punched through the PMIC and clobbered the major chips.


LM10524TMX/NOPB, Texas Instruments, Triple Buck Power Management IC (PMIC) for SSDs:
http://www.ti.com/product/LM10524
http://www.ti.com/lit/ds/symlink/lm10524.pdf
Author:  nelly [ October 24th, 2020, 14:49 ]
Post subject:  Re: Dead SDSSDA-240G - Wrong modular PSU cable
hi there thankyou for your response, it is much appreciated.

could i just quickly ask your opinion on "ZD7". i have gotten a better multimeter with finer probes for access and a magnifying glass and it appears that ZD7 is 1.75v with one probe orientation and 0.64v with the meter probes in the other orientation (with the meter set to diode).

could this ZD7 be a TVS? it is so small that i can barely read the text on the component.

i will look at the additional test which you have prescribed.

i have also probed around a number of resistors and most if not all were continuous.

regards
Author:  nelly [ October 24th, 2020, 16:08 ]
Post subject:  Re: Dead SDSSDA-240G - Wrong modular PSU cable
hi,

I hope that I have measured this correct....but this is what I think the readings are, I've no idea what they are supposed to be though

L1 - GND = 1 Ohm
L2 - GND = 1 Ohm
L3 - GND = 0.4 Ohm

L1 - +5 = 800 ohm approx
L2 - +5 = 800 ohm approx
L3 - +5 = 800 ohm approx

thanks
Author:  fzabkar [ October 24th, 2020, 18:49 ]
Post subject:  Re: Dead SDSSDA-240G - Wrong modular PSU cable
All the outputs of the PMIC are shorted to ground. This means that the IC is dead and the major ICs are probably dead, too.

If I were tackling this job, I would remove the three zero ohm resistors (R78, R90, R115) and test for shorts to ground at each pad. If the loads are still shorted, I would then remove the IC and retest for shorts. That should confirm whether it would be viable to replace the PMIC.

I don't know what ZD7 does. Sorry.
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