Just a couple of basic things to check first, take a look inside the USB port and while your at it also the LCD connector and check for any bent pins or damage (just in case)
Afterwards, disconnect battery and take the measurments outlined in this post
at the main Max PMIC shown in the second photo, resistance relative to ground, put your black probe on ground (screw hole pad) and red probe at the points and let me know the readings
