820-02020 (A2338) stuck @ 5v 0.11amps

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  • iMuhtaseb
    Senior Member
    • Jan 2017
    • 122
    • Palesine
    #1

    820-02020 (A2338) stuck @ 5v 0.11amps

    board came with liquid damage and prior work on SoC PMU (U8100) with short on PP3v8_AON..
    it had corroded caps around U8100, all removed and U8100 replaced successfully.. short removed..

    Board is still stuck 5v 0.11 amps.. I have returned all the missing caps around U8100 thinking maybe they're necessary but sadly no fix.

    PPBUS 12.33v
    PP3v8_AON 3.8v
    PPV5_S2 not present, no short
    PP3v3_S2 not present, no short
    PP1v8_S2 not present, no short..

    I've taken diode and short measurements around all coils for U8100 they were reading normally.. except few lines they were reading tiny above OBD reference readings..

    Tags: None
    • iMuhtaseb
      Senior Member
      • Jan 2017
      • 122
      • Palesine
      #2
      Forgot to mention: I've replaced the U8100 not once but twice; same symptoms

        Comment

        • iMuhtaseb
          Senior Member
          • Jan 2017
          • 122
          • Palesine
          #3
          Took of master PMU to have a look under it for missing pads or bad traces and found this:
          https://www.veed.io/view/f6ae07a6-79...3f?panel=share

            Comment

            • iMuhtaseb
              Senior Member
              • Jan 2017
              • 122
              • Palesine
              #4
              solved; turned out to be a knocked off cap, an important one 🤷🏻

                Comment

                • v.oliota10
                  New Member
                  • Nov 2024
                  • 1
                  • Brazil
                  #5
                  How did you solve it, friend? I have an A2338 with the same defect, 5V and 0.11A

                    Comment

                    • iMuhtaseb
                      Senior Member
                      • Jan 2017
                      • 122
                      • Palesine
                      #6
                      Originally posted by v.oliota10
                      How did you solve it, friend? I have an A2338 with the same defect, 5V and 0.11A
                      As I said in my last post..

                        Comment

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