820-00923 stuck at 5V

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  • rookieme
    Badcaps Veteran
    • Oct 2014
    • 399
    • Greece
    #1

    820-00923 stuck at 5V

    So far I have checked voltage output and LDO's at all four CD3215C00 and I get stable 5V output and 3,3V at LDO's.
    At F7000 I get 0V and over 10K resistance to ground.
    Q7030 takes the 5V but gives 0 so I'm guessing some issue with U7000.
    Am I at the correct direction or there is something I'm missing?
    Tags: None
    • mon2
      Badcaps Legend
      • Dec 2019
      • 14657
      • Canada
      #2
      Re: 820-00923 stuck at 5V

      The ace controllers (cd3215) have other LDO rails as well. Each LDO power rail on each cd3215 needs to be measured for their voltage to ground values.

      Each ACE controller must be operational for the logic board to kick into 20 volts.

        Comment

        • rookieme
          Badcaps Veteran
          • Oct 2014
          • 399
          • Greece
          #3
          Re: 820-00923 stuck at 5V

          I agree with what you say but as I can tell when I had only 5V issue before because of a faulty CD3215 I think I got the 5V also at F7000 but I'm not sure.
          Can you confirm that or it is wrong?

            Comment

            • mon2
              Badcaps Legend
              • Dec 2019
              • 14657
              • Canada
              #4
              Re: 820-00923 stuck at 5V

              Measure the voltage to ground on each pin of D6902.

              Also the reading of PP3V3_G3H.

              Post each measurement.
              Attached Files

                Comment

                • rookieme
                  Badcaps Veteran
                  • Oct 2014
                  • 399
                  • Greece
                  #5
                  Re: 820-00923 stuck at 5V

                  ok, there is a short at pin3 of D6902 so let me figure out where is the issue
                  PP3V3_G3H is 0V of course but with no short

                    Comment

                    • rookieme
                      Badcaps Veteran
                      • Oct 2014
                      • 399
                      • Greece
                      #6
                      Re: 820-00923 stuck at 5V

                      thank you mon2, I made it working again after replacing a cap and the diode D6902
                      I really appreciate your help

                        Comment

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