Macbook Air A2337 820-02016 USB 5V switching on/off ?

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  • ub6ib969
    Senior Member
    • Jul 2010
    • 184
    #1

    Macbook Air A2337 820-02016 USB 5V switching on/off ?

    Hi,

    Have a macbook air a2337 820-02016, customer states was working on it and suddenly shut off. No liquid damage and the logic board is clean. started poking around the cd3217b12 controllers and found multiple shorts listed. Measured in diode mode.
    • CF408 PP3V3_UPC0_LDO = 030.5ohm
    • CF405 PP1V5_UPC0_LDO_CORE = 048.8ohm
    • CF508 PP3V3_UPC1_LDO = 032.6ohm
    • CF131 PP3V3_ATCRTMR1_VCCA = 017.4ohm
    • CF230 PP1V25_S2 = 037.6ohm
    • CF142 PP3V3_S2SW_USBC1 = 016.9ohm also 0V measurement.
    however removed caps one by one to see if shorts will disappear however but still present don't know if it is the usb-c controllers or the u8100? any help would be great!
    Last edited by ub6ib969; 03-25-2025, 10:26 AM.
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