Sorry for my late response. I've been trying to determine the identities and functions of many of the smaller ICs, without success.
![Sad :-(](./images/smilies/icon_sad.gif)
In any case ISTM that all the supplies are present (Vcore = 1V, 1.5V for SDRAM, 1.8V & 3.2V for NANDs). There are some voltages that don't make sense to me.
For example, the capacitor at the left edge of the PCB in "Foto 2018-02-16 13 23 41" has 0V across it.
The nearby T6 transistor has a collector voltage of 0V. ISTM that this transistor drives the enable pin of the dual converter (42H4 V087) on the other side of the PCB. I would have expected that 0V would disable the converter IC, but this is not the case.
Also, the PWDIS pin (SATA power P3) is sitting at 1.5V. AIUI, P3 enables/disables power to the board (just like DEVSLP in your M.2 thread), so it should be at 0V to enable power, and 3.3V to disable. Nevertheless, it appears that floating this pin is sufficient to enable the power, even if the voltage is low.
Power Disable Feature (SATA 3.2+ / 3.3):
http://www.hddoracle.com/viewtopic.php?f=42&t=2094I have found some better photos in the following review:
SanDisk X300s 256GB review:
http://pc.zoznam.sk/sandisk-x300s-256gb-ssd-pre-firemne-prostredie?page=2http://www.pretaktovanie.sk/obr/hdd/ssd/sandisk.sd7ub3q-256g/pcb-top-big.jpghttp://www.pretaktovanie.sk/obr/hdd/ssd/sandisk.sd7ub3q-256g/pcb-bottom-big.jpgMarvell 88SS9188-BJM2, Marvell flash controller
15059 064G, SanDisk, 64Gb MLC NAND flash
D90NP, MT41K128M16JT-125 M:K, Micron, 2Gb (128Mb x 16), 1.35V, 800 MHz, CL11, DDR3L-RS SDRAM:
http://static6.arrow.com/aropdfconversion/3fa481f9b95270e81ded4ead384da91eb6589da8/pgurl_mt41k128m16jt-125.pdfhttps://www.micron.com/~/media/documents/products/data-sheet/dram/ddr3/2gb_ddr3l-rs.pdfTLV62090, Texas Instruments, 3A, 2.5V - 5.5V, Synchronous Step-Down Converter, marking SBV, 16-pin:
http://www.ti.com/lit/ds/symlink/tlv62090.pdfDFLT6V0A, Diodes Inc, 6.0V, marking FAG, 225W, TVS diode:
http://www.diodes.com/_files/datasheets/ds30581.pdfSMBJ6.0A, Diodes Inc, marking KG, unidirectionsl TVS diode, 600W:
https://www.diodes.com/assets/Datasheets/ds19002.pdfhttps://www.diodes.com/assets/Datasheets/ds19003.pdfGD25Q20C, GigaDevice, 2Mbit, 2.7V - 3.6V, serial flash memory:
http://www.gigadevice.com/product/download/146.html?locale=en_USTPS22903, Texas Instruments, marking 4P, 3.6V, 0.5A, 68mOhm, Load Switch:
http://www.ti.com/lit/ds/symlink/tps22904.pdfKGN, 6.0V unidirectionsl TVS diode
42H4 V087 = dual step-down buck converter
T6 = NPN transistor ?
N2 = zener diode ?
3XT 4-pin - load switch? - LDO?
U5A 4-pin - power supervisor ?
U2A 4-pin - power supervisor ?
HHR / HH7 -> HH - 6-pin ??
HS 6-pin ??
TV 6-pin ??
T7 4-pin - LDO?
T8 4-pin - 3.3V LDO?
CY - temperature sensor ? - similar to TMP100 and TMP101 ?