MacBook Pro Retina Late 2013 shows light, fan spin but no chime

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  • mon2
    Badcaps Legend
    • Dec 2019
    • 14732
    • Canada
    #101
    Re: MacBook Pro Retina Late 2013 shows light, fan spin but no chime

    If ALL_SYS_PWRGD = 0 volts then some power rail is not ok and is pulling down this signal line.

    When in this state, measure the voltage at each grey coil and post the list of which rail is not working.

      Comment

      • Gigabit2
        Badcaps Veteran
        • Apr 2022
        • 264
        • United Kingdom
        #102
        Re: MacBook Pro Retina Late 2013 shows light, fan spin but no chime

        Hi mon2,

        Can you please help me, what is this grey coil you talk about? What are these measuring points?

          Comment

          • mon2
            Badcaps Legend
            • Dec 2019
            • 14732
            • Canada
            #103
            Re: MacBook Pro Retina Late 2013 shows light, fan spin but no chime

            Look around for parts that look like this:

            https://electronics.stackexchange.co...er-motherboard

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