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It was water damaged. closed to ISL, changed it and worked fine except battery not detected. Found
R5280=3.4V both side, R5281=3.4v both side. Checked BIL looks good. Any help please.
Yeah, something happened when you changed ISL6259.
Check all solders and be sure didn't knock off any component.
Post volatge for pins 1, 2, 3, 12, 13, 14, 9, 15, 19, 20, 28.
Check resistance between pins 17/18 and 27/28 (ohm mode).
Checked all solders looks very good and no missing any components.
Voltage of ISL
pin1=0v
pin2=16.58v
pin3=3.95v
pin9=0v
pin12=1.1v
pin13=0.8v
pin14=0.8v
pin15=0v
pin19=5v
pin20=5v
pin28=16.46v