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    #1

    Bad Caps causing power outage in LCD?

    I have an LCD whose power will not turn on. There is a cricket sound coming from the transformer on the power supply.

    Is the cricket sound caused by bad caps?

    I attached two images of the caps on the board, they are made by CapXon

    I apologize for the blurry pictures, I can take better pictures if needed.

    Info on the caps

    First Image:

    _ 1
    2 3
    _ 4
    5 6

    1&4 = 220uF 25v
    2&3 = 470uF 35V
    5&6 = 1000uF 16V

    Second Image:

    100uF 400v
    Attached Files
    Last edited by Pico; 07-07-2008, 07:54 PM.
    Tags: None
    #2
    Re: Bad Caps causing power outage in LCD?

    make model number ??
    more info needed ther are lot and lots of set which one is yours ?
    "info is king"

    Comment

      #3
      Re: Bad Caps causing power outage in LCD?

      Originally posted by FIXITNOW
      make model number ??
      more info needed ther are lot and lots of set which one is yours ?
      "info is king"
      Viewsonic, I can get the model when I am home.

      Comment

        #4
        Re: Bad Caps causing power outage in LCD?

        ViewSonic
        VP930b

        Comment

          #5
          Re: Bad Caps causing power outage in LCD?

          Should I just replace them and see what happens?

          Comment

            #6
            Re: Bad Caps causing power outage in LCD?

            Could someone recommend caps to use? I am a noob at knowing what cap manufactures are good/bad

            Comment

              #7
              Re: Bad Caps causing power outage in LCD?

              I would use Panasonic FCs they can be ordered from Digikey.

              In any case you MUST use low ESR caps on this supply.

              I use the FC series on computer PSUs and LCD inverters because they can take the heat that these supplies naturally generate.

              Caps made by Nippon Chemi-con, Nichicon, Rubycon, Samxon, or Panasonic as mentioned above will be fine.

              Crapxon caps are a hit or miss in some environments they perform well while in others they go belly up.

              The noise is a good sign it probably means that the switching FET and the PWM circuitry is operating.

              I've heard all types of wierd transformer noises from bad caps.
              Last edited by Krankshaft; 07-15-2008, 07:14 PM.
              Elements of the past and the future combining to make something not quite as good as either.

              Comment

                #8
                Re: Bad Caps causing power outage in LCD?

                My viewsonic is croaking like a frog?
                Oh, wait, I had the sound turned on.
                Jungle theme.
                Jim

                Comment

                  #9
                  Re: Bad Caps causing power outage in LCD?

                  Originally posted by arneson
                  My viewsonic is croaking like a frog?
                  Oh, wait, I had the sound turned on.
                  Jungle theme.

                  Yeah!!! Jim's back!

                  Comment

                    #10
                    Re: Bad Caps causing power outage in LCD?

                    i'd replace them all

                    Comment

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