A1708 No boot, liquid damaged

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  • Fyod
    Member
    • Jun 2020
    • 28
    • Czech Rep.
    #1

    A1708 No boot, liquid damaged

    How bad is it if I'm getting
    Code:
    CPUVR_SW2 0.25Ω
CPUVR_SW1 0.33Ω
PPVCCCPU_S0G_PH1 0.30Ω
PPVCCCPU_S0G_PH2 0.35Ω
PPVCCCPU_S0G 0.30Ω
PPBUS_G3H_CPU 1.1mΩ (stable 13.1V)
    to ground?

    Could there be a common cause? Blown U7220/7210?
    Last edited by Fyod; 04-09-2021, 03:01 PM.
    Tags: None
    • Fyod
      Member
      • Jun 2020
      • 28
      • Czech Rep.
      #2
      Re: A1708 No boot, liquid damaged

      I read somewhere that low resistance is common on CPU lines.
      Are the above values in the norm?

        Comment

        • piernov
          Super Moderator
          • Jan 2016
          • 4435
          • France
          #3
          Re: A1708 No boot, liquid damaged

          https://logi.wiki/index.php/Resistan...d_List#Skylake
          OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

            Comment

            • Fyod
              Member
              • Jun 2020
              • 28
              • Czech Rep.
              #4
              Re: A1708 No boot, liquid damaged

              Thank you.
              So obviously no normal. I'll check the 7220/7210 chips.

                Comment

                • Fyod
                  Member
                  • Jun 2020
                  • 28
                  • Czech Rep.
                  #5
                  Re: A1708 No boot, liquid damaged

                  So I lifted one side of L7210 and L7220 to isolate the problem. Now the short is only on PPVCCCPU_S0G. SW1/2 are now in the kOhm range and I get 0.42A stable input, fan spin, CPU heats up. No display though.

                  I injected 0.5V 2A into PPVCCCPU_S0G to see if anything gets hot, but I can't find anything even warm. Checked the CPU of course, not warm either.

                  Is there anything else I can try?
                  Last edited by Fyod; 04-15-2021, 01:22 PM.

                    Comment

                    • Fyod
                      Member
                      • Jun 2020
                      • 28
                      • Czech Rep.
                      #6
                      Re: A1708 No boot, liquid damaged

                      Any ideas?

                        Comment

                        • Fyod
                          Member
                          • Jun 2020
                          • 28
                          • Czech Rep.
                          #7
                          Re: A1708 No boot, liquid damaged

                          Bump

                            Comment

                            • mon2
                              Badcaps Legend
                              • Dec 2019
                              • 13830
                              • Canada
                              #8
                              Re: A1708 No boot, liquid damaged

                              What voltage do you read on the 2 phase switching regulators (U7210 & U7220) that create PPVCCCPU_S0G when the logic board is powered ON ?

                                Comment

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