Bad Caps causing power outage in LCD?

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  • Pico
    Member
    • Jul 2008
    • 13
    #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
    • FIXITNOW
      Senior Member
      • Jun 2008
      • 128
      • UK
      #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

        • Pico
          Member
          • Jul 2008
          • 13
          #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

            • Pico
              Member
              • Jul 2008
              • 13
              #4
              Re: Bad Caps causing power outage in LCD?

              ViewSonic
              VP930b

                Comment

                • Pico
                  Member
                  • Jul 2008
                  • 13
                  #5
                  Re: Bad Caps causing power outage in LCD?

                  Should I just replace them and see what happens?

                    Comment

                    • Pico
                      Member
                      • Jul 2008
                      • 13
                      #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

                        • Krankshaft
                          Badcaps Legend
                          • Jan 2007
                          • 2328
                          • USA
                          #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

                            • arneson
                              Badcaps Legend
                              • Sep 2005
                              • 1267
                              #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

                                • Spacedye69
                                  Badcaps Veteran
                                  • Nov 2005
                                  • 698
                                  • US
                                  #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

                                    • Computergeek1200
                                      Member
                                      • Sep 2006
                                      • 16
                                      #10
                                      Re: Bad Caps causing power outage in LCD?

                                      i'd replace them all

                                        Comment

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