Dell E172FPt repair. White lines on screen.

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  • Welchs101
    Badcaps Veteran
    • Sep 2008
    • 979
    • USA
    #1

    Dell E172FPt repair. White lines on screen.

    Hi,

    I am enclosing a picture of what the problem is......i dont think i can describe it in words adequately. Basically, when i power up the monitor.....the LED comes on and "white" lines show up on the screen.

    I did measure the voltages at the connector with the LED on and off.

    Power to monitor and LED off: Gnd lead set to "neg" of big 100uF cap.
    Black: 81.1V
    Brown: 81.1V
    Red: 0.03V
    Orange: 0.03V
    Yellow: 81.1V
    Green: 81.1V
    Blue: 86.1V
    Purple: 86.1V
    Grey: 81.1V
    White: 81.1V



    Power to monitor and LED ON: Gnd lead set to "neg" of big 100uF cap.
    Black: 80V
    Brown: 82.6V
    Red: 0.004V
    Orange: 0.004V
    Yellow: 79.4V
    Green: 79.4V
    Blue: 84.4V
    Purple: 84.4V
    Grey: 79.6V
    White: 79.6V

    Any ideas on if this is fixable or not? If so what to try to identify the problem.
    Attached Files
    Tags: None
    • PlainBill
      Badcaps Legend
      • Feb 2009
      • 7034
      • USA
      #2
      Re: Dell E172FPt repair. White lines on screen.

      Originally posted by Welchs101
      Hi,

      I am enclosing a picture of what the problem is......i dont think i can describe it in words adequately. Basically, when i power up the monitor.....the LED comes on and "white" lines show up on the screen.

      I did measure the voltages at the connector with the LED on and off.

      Power to monitor and LED off: Gnd lead set to "neg" of big 100uF cap.
      Black: 81.1V
      Brown: 81.1V
      Red: 0.03V
      Orange: 0.03V
      Yellow: 81.1V
      Green: 81.1V
      Blue: 86.1V
      Purple: 86.1V
      Grey: 81.1V
      White: 81.1V



      Power to monitor and LED ON: Gnd lead set to "neg" of big 100uF cap.
      Black: 80V
      Brown: 82.6V
      Red: 0.004V
      Orange: 0.004V
      Yellow: 79.4V
      Green: 79.4V
      Blue: 84.4V
      Purple: 84.4V
      Grey: 79.6V
      White: 79.6V

      Any ideas on if this is fixable or not? If so what to try to identify the problem.
      I'd say a bad panel board.

      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

        • Welchs101
          Badcaps Veteran
          • Sep 2008
          • 979
          • USA
          #3
          Re: Dell E172FPt repair. White lines on screen.

          when you say panel board ......... do you mean the "logic" board....ie...not the power supply or the inverter board.

            Comment

            • alexanna
              Member
              • Mar 2010
              • 1346
              #4
              Re: Dell E172FPt repair. White lines on screen.

              Try cleaning/Reseating the ribbon cable from the Logic board to the LCD panel,Both ends.
              Al
              Whatever I do, I consider it a success, if in the end I am breathing, seeing, feeling and hearing!

                Comment

                • retiredcaps
                  Badcaps Legend
                  • Apr 2010
                  • 9271
                  #5
                  Re: Dell E172FPt repair. White lines on screen.

                  Originally posted by Welchs101
                  Power to monitor and LED off: Gnd lead set to "neg" of big 100uF cap.
                  Black: 81.1V
                  Brown: 81.1V
                  Red: 0.03V
                  Orange: 0.03V
                  Yellow: 81.1V
                  Green: 81.1V
                  Blue: 86.1V
                  Purple: 86.1V
                  Grey: 81.1V
                  White: 81.1V
                  This won't help with your panel problem, but when measuring the connector, like above, I usually use a ground screw closest to the connector. This gives me more "normal" readings like 5V DC, etc versus 86.1V.

                  On most connectors, you will see them labeled 5V, GND, BL/ON, etc. I can't tell your board due to the angle though.
                  --- begin sig file ---

                  If you are new to this forum, we can help a lot more if you please post clear focused pictures (max resolution 2000x2000 and 2MB) of your boards using the manage attachments button so they are hosted here. Information and picture clarity compositions should look like this post.

                  We respectfully ask that you make some time and effort to read some of the guides available for basic troubleshooting. After you have read through them, then ask clarification questions or report your findings.

                  Please do not post inline and offsite as they slow down the loading of pages.

                  --- end sig file ---

                    Comment

                    • PlainBill
                      Badcaps Legend
                      • Feb 2009
                      • 7034
                      • USA
                      #6
                      Re: Dell E172FPt repair. White lines on screen.

                      Originally posted by Welchs101
                      when you say panel board ......... do you mean the "logic" board....ie...not the power supply or the inverter board.
                      No, the board under the metal cover at the top of the panel. A cable runs from the logic board to the panel board.

                      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

                        • Welchs101
                          Badcaps Veteran
                          • Sep 2008
                          • 979
                          • USA
                          #7
                          Re: Dell E172FPt repair. White lines on screen.

                          Thanks all for the suggestions / info.

                          I took a look at the "panel" and i could not see anything "obvious" so i am including a few pics of it. If anyone has any ideas please let me know.
                          Attached Files

                            Comment

                            • bonney
                              Senior Member
                              • Oct 2008
                              • 74
                              #8
                              Re: Dell E172FPt repair. White lines on screen.

                              Get a pencil with a rubber top and run the pencil along each tab and see if you can find a tab at fault
                              Attached Files

                                Comment

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