Hitachi Power LED flashing

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  • samtron786
    Senior Member
    • Aug 2016
    • 154
    • germany

    #21
    Re: Hitachi Power LED flashing

    Hello
    MP3398A protection pin find, unfortunately google doesn't tell me much about this MP3398A chip
    many thanks
    Attached Files
    Last edited by samtron786; 04-07-2021, 11:31 AM.

    Comment

    • dick_barton
      Badcaps Legend
      • Aug 2015
      • 6642
      • Wales

      #22
      Re: Hitachi Power LED flashing

      The data sheet says operating voltage between 5 to 28 volts, VCC pin = 6 volts, Enable pin =>1.8 volts
      What voltages do you have?
      Attached Files
      Willing to help but I'm no expert.

      Comment

      • samtron786
        Senior Member
        • Aug 2016
        • 154
        • germany

        #23
        Re: Hitachi Power LED flashing

        I can't measure that, I have to turn the power supply, but how? :-)
        I have no problems with LED all are fine
        I have two
        Power supplies bought the same problem
        Find MP3398A protection pin
        Last edited by samtron786; 04-07-2021, 01:11 PM.

        Comment

        • dick_barton
          Badcaps Legend
          • Aug 2015
          • 6642
          • Wales

          #24
          Re: Hitachi Power LED flashing

          If the leds are fine then what is the problem?
          Willing to help but I'm no expert.

          Comment

          • samtron786
            Senior Member
            • Aug 2016
            • 154
            • germany

            #25
            Re: Hitachi Power LED flashing

            hello i have found something in google with power supply not the place, can you please mark the place for me?
            ISET two resistors 5.09 K ohm and 4.68 K ohm

            Try the 6th leg (ISET) to increase resistance. Instead of 7 kOhm, use 12 kOhm, the current drops and the voltage protection no longer works.
            Attached Files
            Last edited by samtron786; 04-08-2021, 01:52 AM.

            Comment

            • kasfamily
              Badcaps Veteran
              • Aug 2014
              • 765
              • Russia

              #26
              Re: Hitachi Power LED flashing

              Hi,
              Remove the resistor 4701 from the red circle and solder it instead for example resistor 103

              Comment

              • samtron786
                Senior Member
                • Aug 2016
                • 154
                • germany

                #27
                Re: Hitachi Power LED flashing

                Originally posted by kasfamily
                Hi,
                Remove the resistor 4701 from the red circle and solder it instead for example resistor 103
                many thanks

                Comment

                • samtron786
                  Senior Member
                  • Aug 2016
                  • 154
                  • germany

                  #28
                  Re: Hitachi Power LED flashing

                  Unfortunately that didn't help me

                  Comment

                  • samtron786
                    Senior Member
                    • Aug 2016
                    • 154
                    • germany

                    #29
                    Re: Hitachi Power LED flashing

                    I tested the LED again, they are all fine

                    Comment

                    • bosmarin
                      New Member
                      • Mar 2017
                      • 1
                      • bosnia

                      #30
                      Re: Hitachi Power LED flashing

                      47 mF 160v

                      Comment

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