MBP A1707 820-00928-04 No SSD detection

[nyar2]

Hi all.

Total newbie here. I am very interested in learning laptop repair and would have extreme appreciation for some guidance on an issue I am having here.

This machine was pretty badly liquid damaged. Initially, it was stuck at 5v on the charger. I fixed that by finding a shorted cap on the cd3215 1.1v ldo and reprogramming the TBT rom. From there, the machine went to 20v, but nothing happened. 40ma current draw. I reflowed the smc and the machine powered up. With the lifeboat connector in, the machine will stay at the apple logo for 2-3 minutes and will eventually show a question mark. Booting to either Linux or macOS recovery does not show the drive. So, I probed around and especially noted some voltages from page 84 of the schematic. I only have a multimeter at the moment.

PP3V3_SSD_ISNS_R=3.3
PP1V8_SSD_PMC=1.8
PP1V1_SSD_PCIE=1.09
PP1V8_SSD_DRAM=1.791
PP1V0_SSD_CORE=1.0
PP1V2_SSD_DRAM=1.2
PP12V_SSD_VPP=11.92
PP3V3_SSD_NAND=3.298
PP1V2_SSD_DRAM_L12=1.245
PP1V8_SSD_DRAM_L12=1.78
PP1V0_SSD_CORE_L12=1.0
SSD_PGOOD_L=1.75
SSD_RESET_L=3.3
SSD_CLKREQ_L=2-3v (fluctuating in-between these values)
PP12V_SSD_VP=12v

My idea of expected behavior is foggy. I am concerned with the pgood rail. But I don't know enough about it to determine weather or not it is a problem. The pullup resistor on that line looks ok.
If anyone is willing to point me in some kind of direction and help me in this case I would appreciate it.

Thanks in advance to anyone willing to read this.

[mon2]

If the vcc rail is the same voltage then pgood is ok since logic ‘1’

[nyar2]

Hey mon2,

I really appreciate your reply. In that case, is there anything left to check so I can confirm that the SSD is toast? I was thinking diode readings for the lifeboat rails, but I am not sure...

Thanks again.