Check the vbatt line first to make sure there is no short on it.
Test for heat out of a component. I do this by plugging in the battery and charge port ans then connecting to a charger. I generally find that when a pmic has gone in a samsung, an inductor gets hotter than the IC. Just use schematics to trace it and see if it does go to the IC.
Most samsung service manuals suggest changing pmic with power problems.
If you get stuck, let me know
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