Sandisk B-Key SSD Power issues

[Cleanroom]

I have a Sandisk SD6PP4M-256G-1006 that is not getting power to it. Trying to figure out where to start since i do not have any schematics on it. Any help would be appreciated and if closer pics of certain areas are needed i can provide.

Thanks

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[fzabkar]

Could you measure +3.3Vin and +3.3Vout at "C76"? This component looks like a P-channel MOSFET or high-side load switch.

Could you measure V1, V2, VLDO1, VLDO2, and VLDO3 at TPS650532?

Could you identify the markings on IC4 and IC5? What is the voltage on the adjacent capacitor/inductor?

Could you identify what is in the unknown location between the flash controller and NAND?

Could you identify the markings on the two components near the edge connector? Do they test like diodes?


TPS650532, Texas Instruments, 5-Ch Power Management IC w/ 2 Step-Down Converters + 3 LDOs, Vin = 2.5V - 6V, 1A, VQFN-24:
http://www.ti.com/lit/ds/symlink/tps65053.pdf

NT5CC128M16FP-DI, Nanya, DDR3L SDRAM, 2Gbit 128Mx16, 1.35V, 96-Pin TFBGA:
http://www.nanya.com/en/Product/3775/NT5CC128M16FP-DII
http://www.wasuntech.com/upload/2017-06 ... 3_5361.pdf

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MOSFET.jpg (71.85 KiB) Viewed 6503 times

IC4-5.jpg (116.77 KiB) Viewed 6503 times

IC1-3.jpg (82.5 KiB) Viewed 6503 times

3V_comp_2.jpg (37.67 KiB) Viewed 6503 times

3V_comp_1.jpg (33.61 KiB) Viewed 6503 times

[Cleanroom]

Thanks for the info. I may not be able to get the readings to you till Monday.

The components near the connectors I am pretty sure they are Diodes. The one Near the B is reading .740 and the one near the M is reading .760

[fzabkar]

I found this review:
https://www.custompcreview.com/reviews/sandisk-a110-256gb-m2-pcie-ssd-review/

IC5 is a TLV62090.

TLV62090, Texas Instruments, 3A, 2.5V - 5.5V, Synchronous Step-Down Converter, marking SBV, 16-pin:
http://www.ti.com/general/docs/lit/getliterature.tsp?genericPartNumber=tlv62090&fileType=pdf

The same MOSFET(?) is marked as "C77", so this would suggest that "C7" is the device marking and the third character is some kind of date/batch code.