820-00165 PPBUS_G3H is 8.28V

[2informaticos]

Now check for pulse at all PM_SLP_Sx_L signals at same time of drop pulse at PM_PWRBTN_L.
Be sure PM_RSMRST_L is steady high.

 

[grmacs]

NO pulse a PM_SLP_S5/4 when dropping PM_PWRBTN_L

 

[2informaticos]

"Be sure PM_RSMRST_L is steady high."
???

Looks like bad PCH...

 

[grmacs]

yes I checked steady high. any sense in putting any flux/heat to PCH?

 

[2informaticos]

You can try, as looks like last option anyway...

 

[grmacs]

Try 100-200 first? Then try reflow if nada? Why temp will chip possibly burn?

 

[2informaticos]

Do not exceed 200 degrees.
You need to burn eventually accumulated crap; no need to melt the balls.

 

[grmacs]

200 Celsius I assume