M1 MacBook Pro 5V no power on A2338 820-02020

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  • vastok
    New Member
    • Nov 2021
    • 3
    • UK
    #1

    M1 MacBook Pro 5V no power on A2338 820-02020

    Good afternoon everyone.

    I've got M1 machine with some liquid spillage around QP700 (screen connector) and CF601 (charger connector)
    after cleaning with some alcohol everything was working fine until yesterday.


    Click image for larger version Name: Screenshot 2024-10-20 at 17.18.33.png Views: 0 Size: 7.29 MB ID: 3488046

    Macbook won't power, only 5v.
    I've decided to open and check again, RP700 was a bit corroded so I've replaced it from a donor board
    Still no luck.

    After checking if any parts were getting hot, I found that RN420, RN421, RN422, and RN423 were getting hot.
    What does this mean?

    A few measurements I've done:


    F5200
    1 PPVBAT_AON_CHGR_REG Jumping from 7 to 8V
    2 PPBUS_AON Same as above



    CF408
    1 PP3V3_UPC0_LDO 0V , diode mode to ground reading = 519.
    2 GND

    CF405
    1 PP1V5_UPC0_LDO_CORE 0V , diode mode to ground reading = 498.
    2 GND

    CF508
    1 PP3V3_UPC1_LDO 3.43V , diode mode to ground reading = 521.
    2 GND

    CF505
    1 PP1V5_UPC1_LDO_CORE 1.57V , diode mode to ground reading = 507.
    2 GND

    I will be thankful if anyone can help me with this issue 🙌🏻
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