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820-4924 Turns on once, then cycles

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  • 820-4924 Turns on once, then cycles

    This liquid-damaged board will turn on once but then once you try to turn it on again it just cycles, with the CPU getting voltage during that cycling. If you let it sit for a while, it will turn on again, and then not turn on after you shut it down. Any idea what could cause something like this? I attached pre-ultrasonic cleaning pictures.

  • #2
    Does it boot in SMC bypass?
    Be sure to rebuild any corroded trace, if is the case.
    Also some resistors could be damaged.

    Check how ALL_SYS_PWRGD and pins 7 & 3 of U1950 react.
    Check all SPI Bus Termination resistors and traces/solders for U6100.
    Last edited by 2informaticos; 4 days ago.

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    • #3
      Have you tried it without the battery plugged in? Could be a battery issue too. Other than that, check what 2informaticos said

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