Hi
Hope some one can help I’ve changed charging port on nitendo switch every thing looks fine. The problem won’t charge on 15 v it’s only charge on 5 v charger 
See here for a similar post tronicsfixforum(dot)com/t/not-charging-no-shorts-no-draws/4080/20
And test all the things mentioned, in particular checking continuity of USB pins to their respective destinations via a USBC breakout board