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820-4924 No Green Light

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  • 820-4924 No Green Light

    This is my first board that I'm trying to repair. I have listed the different measurements below but I don't know where to check now. The charger light is green for a few seconds then turns orange (I don't know if this matters). I do not have a fan spin when I plug in the board to the charger. Also, do these boards automatically power on when connected to a charger or do I need to short two pins to get it to start?

    When I plug in a USB mouse and plug the board into the magsafe, I the USB mouse does not light up.
    PPBUS_G3H 12.54 V
    OneWire
    U7001 Pin 1 and 2 3.39V
    U7001 Pin 4 3.43V
    U7001 Pin 5 3.43V
    U7001 Pin 3 0V
    U7000 Pin 1 3.4
    U7000 Pin 2 0
    U7000 Pin 3 0
    U7000 Pin 4 3.4V
    U7000 Pin 5 3.4V
    This is a water damaged board with water damage near the lcd connector, keyboard connector, r1830, u8330, u1900, and q5158.

    I have not put the board through the ultrasonic yet just in case I missed an area with corrosion.

    Lastly, I am missing U8310 and I'm waiting on a shipment from mouser to replace it.
    Last edited by _Nicco_; 12-06-2016, 06:49 PM.

  • #2
    Voltage on L7560 and L7520. L7520 may be pulsing check carefully best is with a scope, multimeter is too slow to catch the spike.

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    • #3
      L7560 3.338V
      L7520 ranges between 5.141 and 5.145V on my meter.

      I do not have access to a scope at the moment.

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      • #4
        Voltage on L7320?

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        • #5
          L7320 1.858v

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          • #6
            That means all power is ok. At this point I would clean the board and see if the mouse will light up.

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            • #7
              After cleaning, I'm still getting an orange light.

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              • #8
                The light in magsafe is supposed to be orange.

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                • #9
                  From what I understand, an orange light means the onewire circuit is not working correctly. If a battery is not connected, I should be getting a green light.

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                  • #10
                    Green then orange is NORMAL even without a battery connected.

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