820-3437-B with liquid damage

[1phone.cl]

PM_SLP_S4_L has 0V and does nothing when SMC_ONOFF_L is activated

 

[2informaticos]

Then the problem is PCH related.
I suppose PM_RSMRST_L is steady high and you still note the drop pulse at PM_PWRBTN_L.

Check PCH_DSWVRMEN, PM_DSW_PWRGD, PM_BATLOW_L, 1V05_SUS and the 4 PCH's RTC signals.

 

[1phone.cl]

effectively when I activate SMC_ONOFF_L the pulse is seen in PM_PWRBTN_L but not in PM_RSMRST_L

PCH_DSWVRMEN 3.3V
PM_DSW_PWRGD 3.4V
PM_BATLOW_L 3.3V
1V05_SUS 1.05V

how are they measured of the 4 PCH's RTC signals?

 

[2informaticos]

Read this thread:

HOW TO collection

I hope this "How to" collection will help our members. I will possibly modify this post in time, if updates available. Trigger SMC_ONOFF_L (PMU_ONOFF_L): It reffers to simulate power button function, when the keyboard is not connected. We need to do this when we work with the board...

boards.rossmanngroup.com

 

[1phone.cl]

RTC_RESET_L 3.3V
PCH_SRTCRST_L 3.3V
PCH_INTRUDER_L 3.0V
PCH_INTVRMEN 3.0V

 

[2informaticos]

Heat PCH for test; use quality flux, to burn eventually accumulated crap underneath.
Don't need to melt the balls; no more than 180-200 degrees, for 15-20s.

 

[1phone.cl]

now it's working
What do you recommend me to do now?

 

[2informaticos]

If was question of accumulated crap, you are lucky; should last.
Anyway, pray for it...