MacBook Pro A1502 2013-2014 Not turning on (19.5 V 100–200 mA on charger) repair

Problem description

 * 1) incomplete

Symptoms

 * MacBook not turning on.
 * Only drawing between 100 to 200 mA on charge port.

Solution
As usual check PPBUS_G3HOT, PPVRTC_G3H, PP5V_S5

PP5V_S4 is 0 V (problem here)

C7320 has corroded pad so U7320 had no input on pin 6 so no Vcore was being produced on one of the power phases.

Redoing the corroded trace with a jumper wire and replacing the U7320 chip solved the problem.

Video example