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have a new Apple Macbook Pro A1990 which does not power up, no fans, no chime and black screen. tested USB C port and the:
1. when the board on Apple MacBook Pro connected to the battery --> 19.7v 2.45amps. Amps
2. when board directly connect to the charging cable --> 5.10v 0.50amps...
u3100 not giving any power i test the traces from j3300 on line
PP20V_USBC_XA_VBUS good
usbc_xa_cc1 good
usbc_xa_cc2 has a short to ground i think it c3114 or dz3301 i removed both and still have short does that mean u3100 is bad
We've got a A1706 with no touchbar that is failing to'Critical update.
Also tested the board in a different housing and still the same error.
Not sure where to check next.
Just to add that the Macbook boots in safe mode