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820-3332: Not powering up

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  • 820-3332: Not powering up

    Original issue was GPU panic fault causing image to suddenly stop feeding to the display. The customer tried desoldering the U8900 but ended up bridging a couple pins and yanking off a couple resistors and capacitors. During which the GPU ended up getting fried, resistance measurements of PP1V5R1V35_GPU_REG was reading short. Pulled GPU and short is missing.

    Currently i have U8900 and GPU pulled, but whenever i apply power to the board, i keep popping C8963. Confirmed no short is present. Once i replace the capacitor, i get a resistance reading of about 18k ohms. Is the keeping the GPU and U8900 out of the circuit the reason for C8963 popping?

  • #2
    Really bad idea to power up the board without U8900.
    You left Q8930 Gate terminals floating on the air!
    At least one high side MOSFET is shorted now...

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    • #3
      Crap. Ok thanks.

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