820-3437 wont see SSD

[No-Clean]

Board had a problem with backlight, got fixed but now it wont see the SSD this may have already been there, not liquid damage.

J3700 7=3.3v 8=3.4v

U3740 area looks good and in diode mode all values are ok compared to working board.

I have spend some time on this one and Im fried.

 

[KC Micro Tronix]

is this a AFPS issue? have you ran the disk utility?
have you tried a test SSD? I have seen several of them fail.

 

[No-Clean]

KC Micro Tronix thanks a lot, that was it, this board was put away for a long time and the SSD came with APFS OS on it, the BIOS chip need it to be updated with new firmaware, that solved it, I just installed Mojave on a different SSD and installed the customers SSD and done!