JVC LT-22DE72 only 1/3 of display shows up

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  • mguzinski
    Member
    • Dec 2012
    • 19
    • USA

    #1

    JVC LT-22DE72 only 1/3 of display shows up

    Hi All,
    I'm fairly new here but since joining the forum I have fixed about 6 LCDs with new capacitors diodes and resistors. Once I did have to get a new board however.
    This time I got a JVC LT-22DE72 that only displays the upper 1/3 of the screen. I have had this problem with laptop displays in the past and commonly it was a cable that needed replaced or reseated.
    The display fully lights up when the video board to inverter board cable is unplugged. Sound and the image at the top 1/3 of the screed looks good. No obviously bad capacitors or any other burn marks on any of the boards. The display acts the same with any input source.
    I have not measured any components as of yet but I have reseated all the cables and messed with the ribbon cables to see if the display changed at all. I have also tested continuity on the cable going from the video board to the inverter board and that tested fine.
    Any other tips on testing this one? I'm a little lost right now.
    Thanks in advance for your assistance.
    Mike
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    Last edited by mguzinski; 10-23-2013, 11:13 AM.
  • tom66
    EVs Rule
    • Apr 2011
    • 32560
    • UK

    #2
    Re: JVC LT-22DE72 only 1/3 of display shows up

    Can't see the pictures you have linked?
    Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
    For service manual, schematic, boardview (board view), datasheet, cad - use our search.

    Comment

    • mguzinski
      Member
      • Dec 2012
      • 19
      • USA

      #3
      Re: JVC LT-22DE72 only 1/3 of display shows up

      Originally posted by tom66
      Can't see the pictures you have linked?
      Lets try the links...Can't seem to get them to use Google Drive to display them as IMG

      Comment

      • aaronwt6
        Badcaps Veteran
        • Apr 2013
        • 855
        • US

        #4
        Re: JVC LT-22DE72 only 1/3 of display shows up

        I'm going to vote T-con board but I've never seen one do this. Strictly a guess.

        Comment

        • tom66
          EVs Rule
          • Apr 2011
          • 32560
          • UK

          #5
          Re: JVC LT-22DE72 only 1/3 of display shows up

          I'm going to say panel personally.
          Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
          For service manual, schematic, boardview (board view), datasheet, cad - use our search.

          Comment

          • aaronwt6
            Badcaps Veteran
            • Apr 2013
            • 855
            • US

            #6
            Re: JVC LT-22DE72 only 1/3 of display shows up

            Originally posted by tom66
            I'm going to say panel personally.
            Was thinking the panel issues were usually oriented vertically. Not the case I guess? Just asking for future reference.

            Still learning.

            Comment

            • mguzinski
              Member
              • Dec 2012
              • 19
              • USA

              #7
              Re: JVC LT-22DE72 only 1/3 of display shows up

              Originally posted by tom66
              I'm going to say panel personally.
              Now...not sure this is relevant but when I disconnect the cable from the main A/V board the display shows completely lighted up. Would that still be the panel? I thought if it was the panel only the upper 1/3 would show lighted like it is when it has an input.
              Thanks again...

              Comment

              • tom66
                EVs Rule
                • Apr 2011
                • 32560
                • UK

                #8
                Re: JVC LT-22DE72 only 1/3 of display shows up

                Originally posted by aaronwt6
                Was thinking the panel issues were usually oriented vertically. Not the case I guess? Just asking for future reference.

                Still learning.
                Panel issues can occur in both axes.
                Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                Comment

                • aaronwt6
                  Badcaps Veteran
                  • Apr 2013
                  • 855
                  • US

                  #9
                  Re: JVC LT-22DE72 only 1/3 of display shows up

                  Originally posted by tom66
                  Panel issues can occur in both axes.
                  Ah ok. I gotcha. Just hadn't seen one that looked like that.

                  Comment

                  • aaronwt6
                    Badcaps Veteran
                    • Apr 2013
                    • 855
                    • US

                    #10
                    Re: JVC LT-22DE72 only 1/3 of display shows up

                    Originally posted by mguzinski
                    Now...not sure this is relevant but when I disconnect the cable from the main A/V board the display shows completely lighted up. Would that still be the panel? I thought if it was the panel only the upper 1/3 would show lighted like it is when it has an input.
                    Thanks again...
                    All that means is that the backlight is working.

                    Comment

                    • mguzinski
                      Member
                      • Dec 2012
                      • 19
                      • USA

                      #11
                      Re: JVC LT-22DE72 only 1/3 of display shows up

                      Originally posted by aaronwt6
                      I'm going to vote T-con board but I've never seen one do this. Strictly a guess.
                      Is the t-con board the same as the main A/V board on this set. The ones I have seen before have a separate t-con board.
                      [/URL][/IMG]

                      Comment

                      • aaronwt6
                        Badcaps Veteran
                        • Apr 2013
                        • 855
                        • US

                        #12
                        Re: JVC LT-22DE72 only 1/3 of display shows up

                        Looks like its all in one on this set then. I'd go with Tom's instinct over mine. He's been around a heck of a lot longer. Wouldn't put any money in to a guess on something that size.

                        Comment

                        • mguzinski
                          Member
                          • Dec 2012
                          • 19
                          • USA

                          #13
                          Re: JVC LT-22DE72 only 1/3 of display shows up

                          Originally posted by aaronwt6
                          Looks like its all in one on this set then. I'd go with Tom's instinct over mine. He's been around a heck of a lot longer. Wouldn't put any money in to a guess on something that size.
                          That sounds like a bummer...Some times you win some times you don't. Guess I can part it out. Seems like the LCDs are in the $120 range.
                          Thanks all for your advice and insight!

                          Comment

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