MacBook Pro A1708 Not turning on, PPBUS G3H shorted to ground repair

Problem description

 * 1) incomplete

Symptoms

 * sub 20 ohms on PPBUS_G3H
 * Not turning on

Solution
How to find short circuits

Inject 1 V (increase if no reaction), watch for hot spots with thermal cam. Usually it's a bad tantalum cap on the PPBUS_G3H rail.

Example video (Taking 20 V, 0 A. Ethanol used instead of thermal cam with 0.8 V on PPBUS_G3H, resistance between PPBUS_G3H and CPU coil is 3.6 Ω) Example 2: https://www.youtube.com/watch?v=TZsvvUWUInE (Taking 20 V, 20 mA. Bad capacitor located via visual inspection)

Read the resistance from PPBUS_G3H to Vcore coils (coils around CPU/GPU) IF those measure UNDER 1 Ω (0.3–0.8) then you most likely have a direct 12 V short to CPU/GPU. On this board this situation is always a no fix.