820-00840 liquid dmaage 20v not turning on

[Yoel Ren]

So half this board has liquid over it, i have clean it, but still not turning on
i have 20v at dcin
Ppbus_g3h 13v solid
Pp3v3_g3h 3.3v
No pp5v_s5
No pp3v3_s5
Smc_pm_g2_en is 3.4v
Is this u7800 problem?

 

[Yoel Ren]

No pp3v3_ldo3v

 

[2informaticos]

U7800 generates this voltage.

First check diode mode to ground.
Be sure to get 13V at C7844 (PPBUS_PMIC).

 

[Yoel Ren]

Can i use u7800 from 820-00239? Or must be exact board?
I got 13v in c7844

 

[2informaticos]

"First check diode mode to ground."
???

PMIC has firmware, but could be platform compatible; not sure however...

 

[Yoel Ren]

im sorry, but diode mode what to ground ?
i have tried replacing u7800 from 820-00239, still the same..

 

[Yoel Ren]

okay, know I don't have ppbus_pmic, i tried putting back the old one, still no ppbus_pmic

 

[2informaticos]

PPBUS_PMIC comes from PPBUS_G3H, via R7835.
What happened there???

 

[Yoel Ren]

so.. the ppbus_g3h itself doesnt come now, r7835 doesnt have continuity on it, so I replaced it already

 

[2informaticos]

You did something wrong when swapped PMIC.
Any short?
R7835 cannot blow by itself...