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Hitachi Power LED flashing

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    #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.

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      #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.

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        #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.

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          #24
          Re: Hitachi Power LED flashing

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

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            #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.

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              #26
              Re: Hitachi Power LED flashing

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

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                #27
                Re: Hitachi Power LED flashing

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

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                  #28
                  Re: Hitachi Power LED flashing

                  Unfortunately that didn't help me

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                    #29
                    Re: Hitachi Power LED flashing

                    I tested the LED again, they are all fine

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                      #30
                      Re: Hitachi Power LED flashing

                      47 mF 160v

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