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I dont have LP8548B1SQ_-03 but jave LP8548B1SQ_-04 put it and lcd backlight is gone now, keyboard backlight still not working. DO you know if 03 and 04 are compatible?
Seems that KB backlight circuit starts and overload is triggered.
Check again signals corresponding to KB backlight section.
Change all caps and L/D7720.
changed L7720 again and now it is working. i dont know exactly if it was just l7220 because i also changed U7701 again. Anyway i am sure that l7220 had continuity and there was 5V on both pins. Even if it was so may coil fail?
I remember a friend who I helped online few months ago.
He had a problem with trackpad movement on 820-2915 board.
18.5V is required to work and he changed all in the corresponding area.
ALL, except L5801; guess which was the problem...