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MacBook Pro 2019 A2159 (2-port) wont boot

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    #1

    MacBook Pro 2019 A2159 (2-port) wont boot

    Trackpad clicks.

    Plugging in a genuine USB-C charger and any other charger = 20V and charges all the way.

    Plugging in a Dell USB-C dock or monitor causes the voltage to cycle endlessly between 5V and 19V

    The Caps Lock button doesn't illuminate.

    Holding the power button (fingerprint scanner) for 10 seconds stops the trackpad clicking temporarily, but it starts clicking again after 3 seconds.

    If I open the lid slightly, the trackpad stops clicking (it seems to be detecting the lid opening/closing).

    The keyboard backlight is not working.

    The Touch Bar is not displaying anything.

    Resetting the SMC and PRAM, as well as fully discharging the battery, has not resolved the issue.

    I've replaced the display.

    I've even bench-tested the logic board with nothing attached, plugging in a genuine USB-C charger and any other charger = 20V but the same 5/19V loop cycle when connected to a USB-C hub or monitor.

    No physical components are visually damaged


    I'm at a loss as to where to start troubleshooting this problem any help will be appreciated
    Tags: None
    #2
    Dell USB-C dock or monitor causes the voltage to cycle endlessly between 5V and 19V
    Is this dock a confirmed good USB-C dock? Source another from Amazon for testing. They are fairly inexpensive. The monitor is mating through this same dock?

    Remove all power. Do not use the above USB-C dock.

    Meter in DIODE mode. Red meter probe, yes red, to ground.

    Black meter probe to point to test.

    Test each inductor on the board in DIODE mode -> compare the attached chart.

    Post any suspects. Again - no power / no battery to the board in diode mode testing.

    Click image for larger version Name: inductor_diode_readings.png Views: 45 Size: 743.9 KB ID: 3517117

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      #3
      Click image for larger version Name: inductor_diode_readingsx.png Views: 34 Size: 749.1 KB ID: 3518160

      The USB-C dock and monitor are separate devices used for testing because I initially thought the display was defective due to a crack on the lower right corner.

      WD15 docking station: is capable of outputting 19.5V/3.34A
      Dell P2419HC: has built-in power delivery, capable of outputting 20V/3.25A

      Both devices work on all other Macs and laptops.



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        #4
        I don't have much experience... what should I be looking for? I posted my results in my last post but this method of testing is new to me

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