[SOLVED]820-3476 light on charger but won’t start

[ajdoc]

Board had liquid damage which as been fixed by cleaning only and was working fine for 6 months.

With or without battery won’t start with genuine 85W charger.

PPBUS_G3H = 12.60V
PP3V42_G3H = 3.45V
PP5V_S5 = 5.00V
PP3V3_S5 = 3.43V

PP5V_S4 = 0V
PP3V3_S4 = 0.44V
PM_SPL_S5_L = 0V
S4_PWR_EN = 0V
PCH_PWROK = 0V
PM_PCH_SYS_PWROK = 0V

Don’t know where to start.
Any help?

 

[dukefawks]

The usual corrosion spots, U1950, U1900, U6100 and termination resistors/traces. Is 5V_S4 pulsing?

 

[ajdoc]

Thanks Duke.
Near U1950 cap C1950 was looking a bit burned.
Replaced U1950 and all works fine again - SOLVED