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[SOLVED]2012 A1286 820-3330 no green light, PPBUS_G3H AND PP3V42 Present ,liquid spilled

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  • [SOLVED]2012 A1286 820-3330 no green light, PPBUS_G3H AND PP3V42 Present ,liquid spilled

    Hi,
    having a 820-3330 board, got spilled on 1.back light circuit 2. a bit on u7000 and u8900 and a bit every where, but really nothing much screwed up.

    cleaned off, soldered new back light connector(i know i should fix the power problem first, but that's quick so i replaced it anyway)

    so long story short, U7000 replaced, 4 current sensing resistors connected to u7000 checked,all fine.
    ppbus_g3h =12v, pp3v42 = 3.38v ,sys_onewire=3.3 , adapter_Sense=3.3

    replaced u6900, r6990(was burnt),u6990. still same thing now, NO GREEN LIGHT.

    on the other side of the board, looks totally clean, very sure only this side got spilled on, so can't imagine the SMC got anything under it.

    any advice would be appreciated.

  • #2
    also ,like to add, small area around q5310(not exactly on q5310) but small area around that was spilled,not sure if problem would be something around there.
    but they do look fine after cleaning

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    • #3
      ACOK and SMC_RESET? Known good magsafe board? PPBUS voltage in 4 digits please?

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      • #4
        ACOK=3.3 smc_reset_l=3.3 ppbus=12.12(12.11 sometimes)

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        • #5
          yes I tried couple magsafe board already ,same result, using genuine apple 85w charger

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          • #6
            Dead SMC...

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            • #7
              smc_adapter_en=0v , would that be normal when no green light?
              or should be there even no green light?

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              • #8
                Normal for no green light, SMC is dead replace it.

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                • #9
                  you are right man, it is the SMC, replaced it and boots up now doing testings. you can close this.
                  thanks a lot!appreciate it

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