820-2914 no power/liquid damage

[galvestonmac]

I have an 820-2915 that was liquid damaged. Will not start up. Green light on the charger. Replaced C4691 due to it being burned. Cleaned in ultransonic tank and reassembled. Still a green light on the charger but will not power on.

U7000
Pin 14 2.33v
Pin 19 0v
Pin 20 0v
Pin 12 3.42v


Changed R7001 4.7k due to short


PPBUS_G3H AT C4260 1.75v

PPVIN_S5_HS_OTHER3V3_ISNS AT C7525 1.75v

PPDCIN_G3H AT R7080 1.84v

PP3V42_G3H AT r5091 3.42V stable

PPVRTC_G3H AT C2230 3.42 stable

PP5V_S5 AT U7201 Pin 14 0v

PP5V_S4 AT L5801 0V

PP3v3 0v at C7721

I'm confused about U7201 and how it's powered by PP5V and at the same time it's the chip that generates it. How does that work?

 

[dukefawks]

PPBUS is missing so that is where everything stops. Checked stuff around U7000, pins 17/18, 27/28 resistance? Short on PPBUS?