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

Discussion in 'MacBook Pro' started by soyo, May 11, 2014.

  1. soyo macrumors newbie

    Dec 13, 2010
    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.
  2. soyo thread starter macrumors newbie

    Dec 13, 2010
    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?

    Attached Files:

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