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Dead 820-01598 - voltages present but no boot

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    Dead 820-01598 - voltages present but no boot

    Hi guys,

    820-01598 missing PPVCCEDRAM_S0_CPU after LD.

    The board is totally clean and I get 1.8V at ALL_SYS_PWRGD. The CPU heats up and I can see PPVCC_CPU_PH1 at 0.7V, also PPVCCGT_CPU_PH1 is at 0.77V.

    Magsafe without batt connected at 20V/0.460A. Is the CPU dead or am I missing something?

    thanks in advance.

    #2
    Re: Dead 820-01598 - voltages present but no boot

    Hey! I am having a similar issue.

    CPU heats only heats up a little.

    1.8v at ALL_SYS_PWRGD.

    Not getting anything at PPVCC_CPU_PH1 or PPVCCGT_CPU_PH1.

    Did you find a solution or is it still on the shelf?

    Cheers!

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      #3
      Re: Dead 820-01598 - voltages present but no boot

      I have the exact same issue. All large coils have correct voltage except L7702 (PPVCCEDRAM_S0_REG_R). There is no short on that rail. 1.8v on all_sys_pwrgd. I replaced Q7702 and U7710 with no change.

      Comment


        #4
        Re: Dead 820-01598 - voltages present but no boot

        What's PPVCCGT_CPU_PH1? I have 0 volts (without short) but it's working (but warm i think).

        Comment


          #5
          Re: Dead 820-01598 - voltages present but no boot

          https://logi.wiki/index.php/User:Pie..._I_solve_it.3F
          OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

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