A1286 mid 2010 820-2850-A logic board water damage repair question

[soyo]

My 820-2850-A MB cannot power on after coffee damage.

Test Condition (without battery and without magsafe power board in)

First I checked chip 51125 Vin and found Vin is shorted to GND first. Then I checked ISL6259 chip. The pin 23 is shorted to GND. What is next to check? PPDCIN_G3H is directly from magsafe dc jack board. But it's not shorted.

Any suggestion would be appreciated.

 

[soyo]

I checked some voltages.

I checked some voltages of ISL6259 chip(with DC in and without battery, please see the schematic of the following picture):
Pin 2 16.5V
Pin 19 5.05V
Pin 20 5.06V
Pin 12 3.4V
Pin 23 0V

I checked the resistor between 23 and 22.
0 ohm. It's shored the output. What's the next to check?