Viewsonic ve710b question

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  • duceolsen
    Member
    • Mar 2010
    • 19
    #1

    Viewsonic ve710b question

    Hello all, figured I would post my question on here to see if anyone could help.

    I have several ve710b monitors I have been working on and have come across 3 different power/inverter designs.
    The attached schematic and image are for the version that I have been able to successfully repair just by replacing the circled (red) capacitors.

    The problem I am having is with a version that has removed the items circled (blue) and several of the capacitors have different ratings.
    After replacing all the same caps on this board with new the monitor has the backlight 2 sec on then off problem. This occurs with every monitor that has this board version. I have verified that the cffl lights are good.

    Something I have found by accident is that by removing the circled (green) cap the monitor works fine.

    any ideas?
    Attached Files
    Tags: None
    • PlainBill
      Badcaps Legend
      • Feb 2009
      • 7034
      • USA
      #2
      Re: Viewsonic ve710b question

      Originally posted by duceolsen
      Hello all, figured I would post my question on here to see if anyone could help.

      I have several ve710b monitors I have been working on and have come across 3 different power/inverter designs.
      The attached schematic and image are for the version that I have been able to successfully repair just by replacing the circled (red) capacitors.

      The problem I am having is with a version that has removed the items circled (blue) and several of the capacitors have different ratings.
      After replacing all the same caps on this board with new the monitor has the backlight 2 sec on then off problem. This occurs with every monitor that has this board version. I have verified that the cffl lights are good.

      Something I have found by accident is that by removing the circled (green) cap the monitor works fine.

      any ideas?
      A suggestion: Label the components you have circled with their identifier number (the cap circled in green is C823, for example). This way we can correlate the components in the picture with the schematic.

      PlainBill
      For a number of reasons, both health and personal, I will no longer be active on this board. Any PMs asking for assistance will be ignored.

      Never be afraid to try something new. Remember, amateurs built the ark. Professionals built the Titanic.

        Comment

        • duceolsen
          Member
          • Mar 2010
          • 19
          #3
          Re: Viewsonic ve710b question

          The picture and schematic are not exact with the board I am having trouble with. The board I am having problems with is a newer version and I am unable to find any information online for it.

          On the board I am having issues with.
          C823- is 470uf 25v
          C825- is 470uf 16v
          C828- is 1000uf
          C824- is removed

          I will take a picture of the board I am having issues with and upload it tonight
          Attached Files

            Comment

            • duceolsen
              Member
              • Mar 2010
              • 19
              #4
              Re: Viewsonic ve710b question

              images of front and rear of board
              This board says va721 on it, but is out of a ve710b monitor.

              I have found that every ve710b monitor that was manufactured in July of 2005 has this board in it.
              Notice the really large replacement cap , I acquired a large bag of nichicon 1000uf 25v capacitors and have not gotten around to buying smaller ones.
              Attached Files
              Last edited by duceolsen; 03-10-2010, 08:24 PM.

                Comment

                • duceolsen
                  Member
                  • Mar 2010
                  • 19
                  #5
                  Re: Viewsonic ve710b question

                  I am getting 6v-7v and 14v-17v with C823 on and off the board.

                    Comment

                    • duceolsen
                      Member
                      • Mar 2010
                      • 19
                      #6
                      Re: Viewsonic ve710b question

                      So could someone tell me, is it ok to run without the 470uf 25v capacitor?

                      Or what could be causing it to kick the backlights off after two seconds.

                        Comment

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