820-01041 no power 5V-0.09A

[BCN_Techs]

Hi,

The PCB had short on C4910 (PP3V3_G3H_T), I replaced with a C of equal value but it still won't turn on.

Following the thread https://boards.rossmanngroup.com/threads/820-01041-stuck-at-5v.55802/, I put the voltages:

PPBUS_G3H: 12.31V

"U7800 SYM 1 of 4:
PP3V3_G3H_SOCPMU = 0.6V
PP1V1_SLPS2R = 0V
PP3V3_G3H_RTC_X = 3.37V
PP0V8_SLPS2R = 0V
PP3V0_G3H_RTC = 0V
PP1V2_AWAKE = 0V
CPU_C10_GATE_L = 0V
PP1V05_S0SW = 0V
LDO_RTC = 0V
PP3V3_AWAKE = 0V
PP3V3_S5 = 0V"

Anyone can help me?

 

[2informaticos]

You should get all AWAKE and SLPS2R voltages, before T2 starts to work.
Check for short on all these rails.

None of U7800 LDO voltages present.
So should be PMU related issue.
First check R7900.

 

[BCN_Techs]

Wow, I have no words: R7900 was burned out.

Thank you very much @2informaticos and if it's not too much to ask, could you explain the relationship between the short circuit (PP3V3_G3H_T) and the R7900?