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820-3476-A Cant turn on,Fan not spinning,Charger indicator Orange

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  • 820-3476-A Cant turn on,Fan not spinning,Charger indicator Orange

    i have a 820-3476-A logic board,condition as title.
    PPBUS_G3H at R7005 pin 1 = 1.663v

    resistance mode
    PPBUS_G3H at R7005 pin 1 to L7310 pin 1 = 45.0ohm slowly increasing
    PPBUS_G3H at R7005 pin 1 to GND = 4.3ohm

    any idea?

  • #2
    Shorted Q7310 and/or Q7320, replace both and pray, maybe CPU is toasted....

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    • #3
      No, if Q7310/20 was shorted the resistance from PPBUS to L7310 would always be lower than PPBUS to GND. Something else is shorted, check resistance from PPBUS to all the coils and see if any are lower than that 4.3 Ohm. If you cannot find that you can inject voltage on PPBUS and see if anything heats up.

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