a1706 820-00923-A. CPU hot No boot

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  • azemar
    Member
    • Nov 2022
    • 46
    • France
    #1

    a1706 820-00923-A. CPU hot No boot

    hello I am asking for your help on an a1706 820-00923-A.
    The CPU heats up
    PPVCC_S0_CPU=1.07V
    no change after 10s
    voltage at charger 20V 0.6 to 0.89A varies

    I did the tests with the motherboard outside the chassis

    No trace of corrosion found either.

    THANKS​
    Tags: None
    • mon2
      Badcaps Legend
      • Dec 2019
      • 14023
      • Canada
      #2
      What is the voltage to ground of PPBUS_G3H ?

        Comment

        • azemar
          Member
          • Nov 2022
          • 46
          • France
          #3
          PPBUS_G3H​=13.22V

            Comment

            • mon2
              Badcaps Legend
              • Dec 2019
              • 14023
              • Canada
              #4
              Remove all power. Measure the resistance to ground of each and every inductor for a review. If the resistance is too low, that power rail will not powere up due to the current sense resistor observing a larger than usual voltage drop = excessive current draw so shuts it down. You will need to review which rail is not powering up.

              Study the power up sequence that is attached.

              Click image for larger version Name: A1706_sequence1.png Views: 0 Size: 1.11 MB ID: 3207568


              Click image for larger version Name: A1706_sequence2.png Views: 312 Size: 1.04 MB ID: 3207569
              Last edited by mon2; 01-30-2024, 01:23 PM.

                Comment

                • azemar
                  Member
                  • Nov 2022
                  • 46
                  • France
                  #5

                  I just took the measurements and couldn't find any shorts.
                  PP5V_s0= 5.02v
                  pp3v3_s0=3.38v
                  pp1v8=s0=1.82v
                  PPVCC_S0_CPU=1.07v
                  PPVCCGT_S0_CPU=0V 1.7ohm​

                    Comment

                    • azemar
                      Member
                      • Nov 2022
                      • 46
                      • France
                      #6
                      Hello
                      I think that the 19 svid sequence is not working, how can I test this part?

                      Svid=vidsclk ?

                        Comment

                        • azemar
                          Member
                          • Nov 2022
                          • 46
                          • France
                          #7
                          Does anyone have an idea where I can do other tests?

                            Comment

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