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A1706 MBP 820-00239-09 Issues

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    #1

    A1706 MBP 820-00239-09 Issues

    I have a 2016 A1706 Macbook Pro touchbar.

    Board will take 20.1 v from charger. Amps range from .4 to .9. Jump back and forth.

    Fans turn on, beeps when plug charger up, and caps lock light will turn on and off.

    13.1 V stable at ppbus.

    Board is clean, no obvious burnt chips, no water damage.

    CPU never gets warm and no display.

    Where to go from here. Im Stumped.
    Tags: None
    #2
    Re: A1706 MBP 820-00239-09 Issues

    Try a SMC reset.

    Comment

      #3
      Re: A1706 MBP 820-00239-09 Issues

      Tried that still same result.

      Should the C1161 (located below CPU) read to ground on pins 1 and 3. According to boardview. Pin 1 is ppvccgt_s0_cpu and 2 is ground. But both read to ground terminals

      Comment

        #4
        Re: A1706 MBP 820-00239-09 Issues

        No, but be careful on your measurements. How accurate is your multimeter?

        Select the lowest scale on your tool -> remove all power -> now measure the resistance to ground with your multimeter.

        Being a CPU, it is a low voltage semiconductor and the resistance is expected to be low.

        What is the EXACT resistance in ohms that your meter is reading ?

        From past experience, we had an A1398 CPU @ 1 ohms and the logic board worked fine (measured on our Fluke 87V meter).

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          #5
          Re: A1706 MBP 820-00239-09 Issues

          Meter is a milwaukee TRMS, not a expensive meter. I have a couple of flukes at my office that are more accurate, im sure. This is just the meter i use everyday to do electrical work.

          I am getting 4.9 ohms between ground and pin 1. Which seems quite high

          Comment

            #6
            Re: A1706 MBP 820-00239-09 Issues

            I think you are fine here. In diode mode, the meter will beep as a short condition.

            Comment

              #7
              Re: A1706 MBP 820-00239-09 Issues

              I also did notice with my thermal cam that the cpu was getting warm. That’s how I zeroed in on this chip. It was showing hot on the thermal cam.

              I can plug power up and hear the beep, like plugging in a iPhone to charge. Fans start spinning, caps lock light will turn on and off, and fans then start spinning faster, like top speed. But nothing else happens. All usb c ports get same result.

              Comment

                #8
                Re: A1706 MBP 820-00239-09 Issues

                https://boards.rossmanngroup.com/thr...booting.58607/

                Comment

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