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Dell E172FPt repair. White lines on screen.

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    #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
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    #2
    Re: Dell E172FPt repair. White lines on screen.

    Originally posted by Welchs101 View Post
    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

      #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

        #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

          #5
          Re: Dell E172FPt repair. White lines on screen.

          Originally posted by Welchs101 View Post
          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.
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          Comment

            #6
            Re: Dell E172FPt repair. White lines on screen.

            Originally posted by Welchs101 View Post
            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

              #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

                #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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