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Apple 820-01326-05 after water spill not start

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    Apple 820-01326-05 after water spill not start

    Hello.
    I have this Apple 820-01326-05 that after water spill wont start.

    Chcrger works but charging is in loop. USB-C negotiate to 20V ok, slowly start charging from 0.4A to 0.9A and after that it reset to 0.05A and after 1 sec goes from 0.4A again. loop takes about 6-7 seconds

    I found 12.9V, 20.5V, 3.3V. no short.

    now i dont have schema or BV so i cannot measure more

    laptop was in other shop so i cannot find water spill corosion
    Last edited by ktmmotocross; 09-14-2021, 06:27 AM.

    #2
    Re: Apple 820-01326-05 after water spill not start

    https://logi.wiki/index.php/Schemati...in_Logic_Board
    820-01326 ❌ ❌ Use 820-01041 boardview and schematic, 820-01326 unavailable, only difference is Vega GPU as far as i know
    OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

    Comment


      #3
      Re: Apple 820-01326-05 after water spill not start

      thanks. interresting site.

      DOnt have enybody some starting list of rails for this newer macs?

      Comment


        #4
        Re: Apple 820-01326-05 after water spill not start

        I found that U7650 have bad V5REG signal/only one pulse in2sec loop/so i replace IC. now i have stableV5REG, V3REG,G3_HOT, 3.3V ALW, but charger still charge untill draw 1A and then reset to 0.0A and start charging again

        i also dont have
        Attached Files
        Last edited by ktmmotocross; 09-19-2021, 04:01 AM.

        Comment


          #5
          Re: Apple 820-01326-05 after water spill not start

          found
          SMC_SYSRST_L - 0.0V
          SMC_PCH_SYS_PWROK - 0.0V
          SMC_PCH_PWROK - 0.0V
          SMC_RSMRST_L - 0.0V

          so looks like my SMC is not work

          Comment


            #6
            Re: Apple 820-01326-05 after water spill not start

            this guy have starting sequence diagram for A1990. where can i get one?

            https://www.youtube.com/watch?v=aTV7dAtSb9E

            Comment


              #7
              Re: Apple 820-01326-05 after water spill not start

              https://logi.wiki/index.php/T2_and_C...ence#820-01598
              OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

              Comment


                #8
                Re: Apple 820-01326-05 after water spill not start

                veeery nice. i came to half by screen capture his video, but this is way better

                found that this voltage loop works only on charger on battery i have steady voltage

                but still no work even only on battery. i found that CHGR_RST_IN_R is constant 0.0V and not reacting on power button. what is it state when work?
                Last edited by ktmmotocross; 09-20-2021, 07:50 AM.

                Comment


                  #9
                  Re: Apple 820-01326-05 after water spill not start

                  nobody knows what this signal suppost to look like?

                  Comment


                    #10
                    Re: Apple 820-01326-05 after water spill not start

                    Originally posted by ktmmotocross View Post
                    I found that U7650 have bad V5REG signal/only one pulse in2sec loop/so i replace IC. now i have stableV5REG, V3REG,G3_HOT, 3.3V ALW, but charger still charge untill draw 1A and then reset to 0.0A and start charging again

                    i also dont have
                    thanks!

                    Comment

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