Yamaha organ display faulty-see stripes

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  • buchman
    Badcaps Veteran
    • Aug 2015
    • 283
    • greece

    #1

    Yamaha organ display faulty-see stripes

    Hi guys,
    I have a Yamaha organ with a faulty display.
    When I turn it on half of the display is working for about 2 seconds and then I can see only stripes all over the display.

    my question is what component can usually go bad? e.g. a diode, a capacitor, a transistor etc.?

    Thanks in advance.
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  • freakaftr8
    Badcaps Legend
    • Oct 2012
    • 3743
    • USA

    #2
    Re: Yamaha organ display faulty-see stripes

    Usually either a diode or capacitor. More or less a capacitor because it's like this upon power up and gets worse. First look for bad solder connections. Also the flat ribbon to LCD could be a problem.
    Did I leave the soldering iron on?

    Comment

    • buchman
      Badcaps Veteran
      • Aug 2015
      • 283
      • greece

      #3
      Re: Yamaha organ display faulty-see stripes

      Originally posted by freakaftr8
      Usually either a diode or capacitor. More or less a capacitor because it's like this upon power up and gets worse. First look for bad solder connections. Also the flat ribbon to LCD could be a problem.
      What are the most suitable testing methods to pinpoint the bad component besides multimeter?

      Comment

      • freakaftr8
        Badcaps Legend
        • Oct 2012
        • 3743
        • USA

        #4
        Re: Yamaha organ display faulty-see stripes

        Need schematics on the driver circuits, but you could try pressing on connections to LCD to start. Wiggle cables here and there and unplug and reconnect cables and make sure contacts are clean.
        Did I leave the soldering iron on?

        Comment

        • buchman
          Badcaps Veteran
          • Aug 2015
          • 283
          • greece

          #5
          Re: Yamaha organ display faulty-see stripes

          When I wiggle the cables I do see a change on the screen. The cable is soldered to the circuit board. How do I fix it?

          Comment

          • freakaftr8
            Badcaps Legend
            • Oct 2012
            • 3743
            • USA

            #6
            Re: Yamaha organ display faulty-see stripes

            Could you post a picture of the cable on the circuit board in question you are talking about?
            Did I leave the soldering iron on?

            Comment

            • buchman
              Badcaps Veteran
              • Aug 2015
              • 283
              • greece

              #7
              Re: Yamaha organ display faulty-see stripes

              https://youtu.be/McbMNHzE648

              That is the link for the same problem as mine.

              Comment

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