A1502 (820-3476) SSD Not Detected

[Max7]

All seems to be working fine.
SSD is not detected (not with Option Key or Recovery Mode either)

PP3V3 voltages are available. SDD_POWER_EN and SSD_CONN_RST_L pins are high.

C3710-3717 seem healthy.

What else I can check ?

Thanks

 

[2informaticos]

Any history available?
Post U3740 voltages.

 

[Max7]

Not much history I am afraid, came as not booting up (it was booting to ? folder)
Voltages:
P3V3SSD_VMON = 1V
SSD_RESET_L = 3.29V
SSD_RESET_CONN_L = 3.42V
SSD_PWR_EN = 3.24V
SSD_CLKREQ_CONN_L = 3.29V
SSD_CLKREQ_L = 3.42V

 

[2informaticos]

All voltages look good.
Try cleaning SSD connector and resolder its pins.
Did you try another SSD?
It doesn't appear at all in Disk Utility, or is only APFS issue?