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A1708 No boot, liquid damaged

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    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.

    #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?

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      #3
      Re: A1708 No boot, liquid damaged

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

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        #4
        Re: A1708 No boot, liquid damaged

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

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          #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.

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            #6
            Re: A1708 No boot, liquid damaged

            Any ideas?

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              #7
              Re: A1708 No boot, liquid damaged

              Bump

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                #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 ?

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