2018 Mac Mini A1993 LogicBoard 639-06830 No boot,Blank display,Fan blasts briefly

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  • rp93
    New Member
    • Dec 2023
    • 3
    • USA

    #1

    2018 Mac Mini A1993 LogicBoard 639-06830 No boot,Blank display,Fan blasts briefly

    I am trying to troubleshoot my 2018 Mac Mini. It all of a sudden would not respond/wake up. So i turned it off and turned it back on. When I power it up, the fan blasts hard for a second, then shuts off, power light may go off, then back on, sometimes blasting the fan again. It does this a few times then eventually(sometimes) the power light stays on and the fan runs at a normal speed, but with no HDMI/display. Nothing ever shows up on the display.(no sound, no chime, checked wifi router to see if it trys to connect, which it does not)

    I have the Mac Mini completely disassembled and have checked some cap continuities/resistance, but I'm really not sure what the correct values are(still looking for a schematic). No obvious visual cues of burnt components

    At this point i'm just looking for some suggestions, schematics. I do have some experience with soldering, and have meters and a handheld oscilloscope if needed.


    Thanks!
    RP
  • rp93
    New Member
    • Dec 2023
    • 3
    • USA

    #2
    L7210 ~3ohms
    L7230 ~3ohms
    L7250 ~3ohms
    L7330 ~7ohms
    L7310 : ~8ohms

    to ground.

    This screenshot shows these on the board top down in same order.(the text is small but its the 5 bigger squares next to the CPU/ram slot) Is this a shorted CPU? Do i need to desolder these coils and check resistance?
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