Symptom: Plug in DC magsafe showing green light and change to orange colour for battery charging. In this case, unit unable to power on when power button has been press. No fan spinning, no start up sound.
Step debug as below:-
1. Unit still unable to power on via power pad.
2. Failure remain the same after SMC reset.
3. Power Rails measure as below with only adaptor plug in (no Battery):-
> PPBUS_G3H -- 12.57v
> PPBUS_CPU_IMVP_ISNS -- 11.58v
> PPDCIN_G3H -- 16.5v
> PP3V42_G3H -- 3.42v
> PP3V3_S5 -- 3.32v
4. Others power rails no voltage.
Step debug as below:-
1. Unit still unable to power on via power pad.
2. Failure remain the same after SMC reset.
3. Power Rails measure as below with only adaptor plug in (no Battery):-
> PPBUS_G3H -- 12.57v
> PPBUS_CPU_IMVP_ISNS -- 11.58v
> PPDCIN_G3H -- 16.5v
> PP3V42_G3H -- 3.42v
> PP3V3_S5 -- 3.32v
4. Others power rails no voltage.
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