Kingston SSDNOW 300 Case Opening

[fzabkar]

Let me see if I understand you correctly.

You set your DMM on the 200 ohms resistance range.

You power off the SSD.

You connect one probe to one side of the capacitor and the other probe to the other side of the capacitor.

You now see 0.3 ohm on your meter.

You repeat this procedure for all capacitors and get the same result.

Is this correct?

[Kingston]

correct
sometimes 0.2 when measured again I've got 0.3

[fzabkar]

correct
sometimes 0.2 when measured again I've got 0.3

Wow! I can't see a solution for you. Sorry. :-(

[Kingston]

thank you for your effort

question
there may be more than one component causing it or is it definitely one component causing it?

[fzabkar]

The flash controller would require a core voltage (~ 1V), so if Vcore is shorted, then one would have to suspect the controller. The NAND array would have its own supplies (I would think), so AFAICS there must be at least two bad components. I really can't imagine how your SSD could have become damaged in this way.

Does any IC heat up?

[Kingston]

everywhere is dead cold
except one area
1 or the 2 chips below V3 (either 13 1E and the chip left to it or both (It's too small to say for sure which one) ) is getting warm towards a bit hot

[fzabkar]

If the regulator IC is not enabled but is heating up excessively, then ISTM that it must be faulty. This wouldn't account for all the faults, though.

[Kingston]

I can't edit the previous post

correction its either the chip below V3 or the BDC (AP3422) chip

[Kingston]

replacing these 2 chips will solve the problem ?

[fzabkar]

The "BDC" chip is probably the one that is heating up. It is enabled and is driving into a short circuit. Therefore the problem is most likely in the external circuit, not in the chip.

[Kingston]

what could it be?

I'm trying to put my hand on equivalent SSD (working one), what should I measure there to compere?

[fzabkar]

I would always start by measuring the supply voltages (V1 - V4). That should give us an idea what they do and where they go.

[Kingston]

OK,

thank you so much, sir

I will update when I have A working one to compare

[Kingston]

I was able to put my hand on an 120GB Kingston, but it has A totally different PCB

but I have found a 60GB which is "almost" identical, will it work to compare measurements?

[fzabkar]

It looks similar -- different ICs but probably similar output voltages. There is one additional regulator on the 60GB version near the screw hole on the flash side.

[Kingston]

thank you

what would be the V1 ?

Attachments

V_1.JPG (24.84 KiB) Viewed 12606 times

[Kingston]

here are the measurements

on 60

5Vin OK
5Vout OK

resistance 5Vin to ground 6.90 "K"ohm (get noting (0L) when measured on 200 ohm)
resistance 5Vou to ground 16.18 "K"ohm (get noting (0L) when measured on 200 ohm)
resistance 5Vin to 5Vout 21.80 "K"ohm (get noting (0L) when measured on 200 ohm)

V1 = 5.02V resistance = 16.21 "K"ohm (get noting (0L) when measured on 200 ohm)
V2 = 2.84V resistance = 5.35 "K"ohm (get noting (0L) when measured on 200 ohm)
V3 = 1.00V resistance = 0.465 "K"ohm (get noting (0L) when measured on 200 ohm)
V4 = 2.85V resistance = 73.30 "K"ohm (get noting (0L) when measured on 200 ohm)



on 240

5Vin OK
5Vout OK

resistance 5Vin to ground 6.58 "K"ohm (get noting (0L) when measured on 200 ohm)
resistance 5Vou to ground 21.60 "K"ohm (get noting (0L) when measured on 200 ohm)
resistance 5Vin to 5Vout 24.27 "K"ohm (get noting (0L) when measured on 200 ohm)

V1 = 0.14V resistance = 0.3 ohm
V2 = 0.00V resistance = 0.3 ohm
V3 = 0.23V resistance = 0.4 ohm
V4 = 0.00V resistance = 0.3 ohm

any thoughts ?

[fzabkar]

The rule of thumb for switchmode step-down converters is to locate the junction of an inductor and capacitor(s). That's the output voltage test point. Either measure the voltage across the capacitor, or measure the voltage between the inductor and ground.

See http://www.hddoracle.com/viewtopic.php?f=59&t=231#p=16236

Your measurements would suggest that V3 is the Vcore supply for the flash controller. That's bad news.

As for V1, measure the voltage at the 1R5 inductor.

I can't identify the B7CH part, but it appears to be a dual step-down converter made by Monolithic Power. The other ICs are as follows:

MP28258DD, Monolithic Power, 3A, 4.2V - 20V Input, Synchronous Step-down Converter, marking AAA, QFN12:
https://www.monolithicpower.com/pub/media/document/MP28258_r1.14.pdf

RT8010GQW, Richtek, 1.5MHz, 1A, High Efficiency PWM Step-Down DC/DC Converter, 2.5V to 5.5V input, marking ET, adjustable, WDFN-6L:
http://www.richtek.com/assets/product_file/RT8010=RT8010A/DS8010A-10.pdf

Attachments

MP28258_pinout.gif (9.71 KiB) Viewed 12554 times

RT8010_app_cct.gif (10.45 KiB) Viewed 12554 times

RT8010_pinout.gif (6.9 KiB) Viewed 12554 times

[Kingston]

you think the controller is the culprit ?

1R5 = 1.00V

[fzabkar]

AFAICT, the 88SS1074 is a dual core controller, so V1 and V3 are probably its Vcore1 and Vcore2 supplies.

The ETH component constitutes a fifth supply, possibly 1.8V.