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.