Xbox One Controller 1708

Hello everyone, I’m kind of frustrated, with a repair my friend asked me to do. So he dropped his Xbox one controller and it wouldn’t turn on, I tried cleaning the battery pads, tried plugging it in to my Xbox and update it, but it didn’t read, and still there is no
Light teven if I try plugging it in or Using battery. So I took it apart and cleaned the board with ice propel. Still same problem, then I took my hot air gun and held it on top and bottom of the board with low temp to reflow everything same issue. So I took the bottom board and just plugged that in, and when I hold the on button the light comes up, but when I take my finger off in turns off. I really do not know what to do, I don’t have a lot of experience with multimeters. Plz help. Thanks