A1706 MBP 820-00239-09 Issues

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  • Blue99ls1
    New Member
    • Sep 2022
    • 5
    • Usa
    #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
    • mon2
      Badcaps Legend
      • Dec 2019
      • 14023
      • Canada
      #2
      Re: A1706 MBP 820-00239-09 Issues

      Try a SMC reset.

        Comment

        • Blue99ls1
          New Member
          • Sep 2022
          • 5
          • Usa
          #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

            • mon2
              Badcaps Legend
              • Dec 2019
              • 14023
              • Canada
              #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).

                Comment

                • Blue99ls1
                  New Member
                  • Sep 2022
                  • 5
                  • Usa
                  #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

                    • mon2
                      Badcaps Legend
                      • Dec 2019
                      • 14023
                      • Canada
                      #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

                        • Blue99ls1
                          New Member
                          • Sep 2022
                          • 5
                          • Usa
                          #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

                            • mon2
                              Badcaps Legend
                              • Dec 2019
                              • 14023
                              • Canada
                              #8
                              Re: A1706 MBP 820-00239-09 Issues

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

                                Comment

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