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Why do you bother with L7030???
It is not directly connected to PPBUS_G3H like in old boards.
If PPBUS_G3H is stable, there is no problem on U7000 area.
The problem is that SMC (inside T2) does NOT properly communicate with U7000.
can it be U7650? i was take it from older board (old TPS51980 and the original is TPS51980A)
I was compare with good board.. before i was checking voltage there i want to know if is this to TPS are the same.
dont think so..before fan works but the mac was dead and NO voltage at 5v rail and G3S 3v/5v rail at all, after replace U7560 the V was appear but with pulsing now change U7650 again(from old board (macbook 2015) but the same
The heat applied to the board changed the behaviour.
Something else reacted at heat.
There should be more things affected by corrosion.
Try heating BGA chips with quality flux and pass to board trough ultrasonic cleaner at the end.