Macbook Pro a1990 820-01041-A no power draw

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  • dj0nes
    New Member
    • Jan 2024
    • 2
    • USA
    #1

    Macbook Pro a1990 820-01041-A no power draw

    Hello, I'm new to this level of troubleshooting (had not heard of openboardview 30 minutes ago), but have a multimeter and just found the schematic for this mainboard (820-01041-A).

    Board & battery were replaced by Apple late 2021, stopped working late 2022 after sitting on a shelf for a while, and haven't touched it since. Did some googling for similar posts, and tested these voltages with the laptop plugged in. I only moved the charging cable to a different port for testing PP20V_USBC_TB_VBUS, not sure if that's relevant.
    • PPBUS_G3H@F7000 (asked for here on a similar post) is showing 12.28v, but no draw (.3w) at the wall outlet.
    • PP5V_G3S@J6000 is exactly 0v (mentioned here, as are the following ports)
    • PP3V3_G3H_T@C7669 is 3.3v
    • PP20V_USBC_TB_VBUS@TP1 is 5.15v when the charging cable is plugged into the lower port on that side. Otherwise 0v.
    • PP3V3_G3H_RTC_X@TP1 is 3.3v
    I'm guessing that PP5V_G3S is sus, but not sure what to do next. Thank you in advance for any help!
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