JVC LT-40V750 stuck in service mode switching colors.

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  • thesame
    Senior Member
    • Mar 2018
    • 121
    • Romania

    #1

    JVC LT-40V750 stuck in service mode switching colors.

    The tv is stuck in service mode, i have unpluged it for several times, tryed to power it separate from remote , tryed some reset method using menu button and 4725 typed twice in a row to enter or disable the service mode but it didn't work. The board has no damaged components, could it need a fresh firmware or the emmc could be dead?
    Attached Files
  • nomoresonys
    Badcaps Legend
    • Jan 2013
    • 12093
    • U.S.

    #2
    Try holding in the power button on tv, hold it til the screen changes, shouldn't take more than a minute if it's going to work.

    Comment


    • thesame
      thesame commented
      Editing a comment
      I have tryed it , i've holded the power wheel for 1 full minute with the tv off and it was keep restarting, and i have also tryed holding it while the tv was on but still no change.
  • yokoono
    Badcaps Veteran
    • Apr 2010
    • 479

    #3
    Clean the contacts from the lvds ribbon.​

    Comment


    • thesame
      thesame commented
      Editing a comment
      I have just cleaned it , nothing changed.
  • nomoresonys
    Badcaps Legend
    • Jan 2013
    • 12093
    • U.S.

    #4
    Could try a firmware update, had an old sony with same symptom, update fixed it, some tvs you need to select things with remote to continue update, this old sony kdl did not, you just plug in usb drive and turn on tv, when it was done the front led changed to a solid color, took about 30 minutes. Important to make sure it's done, could brick tv if an update is interrupted before it's finished.

    Comment

    • Diah
      Badcaps Legend
      • Feb 2013
      • 6355
      • Germany

      #5
      its much like you have broken contact pins on the LVDS ,, need to inspect carefully... if they are 100% fine... then from any firmware for 17MB97..use only the script txt file.... and comment all # till the end keep only the line reset

      Comment

      • yokoono
        Badcaps Veteran
        • Apr 2010
        • 479

        #6
        Panel is VES400UNDS-2D-N11 ?.

        Comment


        • thesame
          thesame commented
          Editing a comment
          Yes, that is the pannel model.
      • yokoono
        Badcaps Veteran
        • Apr 2010
        • 479

        #7
        Stick firmware. Try at your own risk. If the remote control no longer works, use a programmable one.​ Cred ca stii procedura de instalare.
        https://files.fm/u/47jm44yhnz

        Comment


        • thesame
          thesame commented
          Editing a comment
          Thank you, da multumesc frumos.
      • thesame
        Senior Member
        • Mar 2018
        • 121
        • Romania

        #8
        Quick update, i found another 17MB97 good working board, and the pannel acts the same with the donor board switching colors.

        Comment

        • vinceroger69
          Badcaps Legend
          • Mar 2012
          • 6714
          • uk

          #9
          faulty t con board maybe

          Comment

          • Diah
            Badcaps Legend
            • Feb 2013
            • 6355
            • Germany

            #10
            Originally posted by vinceroger69
            faulty t con board maybe
            never.... damaged lvds or its sockt

            Comment

            • nomoresonys
              Badcaps Legend
              • Jan 2013
              • 12093
              • U.S.

              #11
              Maybe check if lvds cable has continuity from end to end.

              Comment

              • thesame
                Senior Member
                • Mar 2018
                • 121
                • Romania

                #12
                I may have found the culprit . Click image for larger version

Name:	PXL_20240115_074222424.jpg
Views:	308
Size:	296.1 KB
ID:	3178824

                Comment

                • vinceroger69
                  Badcaps Legend
                  • Mar 2012
                  • 6714
                  • uk

                  #13
                  Originally posted by thesame
                  I may have found the culprit . Click image for larger version

Name:	PXL_20240115_074222424.jpg
Views:	308
Size:	296.1 KB
ID:	3178824
                  yes that will do it

                  Comment

                  • vinceroger69
                    Badcaps Legend
                    • Mar 2012
                    • 6714
                    • uk

                    #14
                    Originally posted by Diah

                    never.... damaged lvds or its sockt
                    Thanks diah im still learning hence i mentioned maybe.

                    Comment

                    • nomoresonys
                      Badcaps Legend
                      • Jan 2013
                      • 12093
                      • U.S.

                      #15
                      Looks like a solder blob, wonder how that got there.

                      Comment

                      • vinceroger69
                        Badcaps Legend
                        • Mar 2012
                        • 6714
                        • uk

                        #16
                        Originally posted by nomoresonys
                        Looks like a solder blob, wonder how that got there.
                        i thought maybe a screw hole

                        Comment

                        • lotas
                          Badcaps Legend
                          • Jan 2016
                          • 4524
                          • Russia

                          #17
                          A bolt was inserted longer than necessary or it was tightened without a stand and the bolt damaged the cable.

                          Comment

                          • thesame
                            Senior Member
                            • Mar 2018
                            • 121
                            • Romania

                            #18
                            Problem solved, by replacing the lvds flex, the owner just realized when i told him that he tryed to fix it on the holder and he put one of the screw in the wrong hole.

                            Comment

                            • nomoresonys
                              Badcaps Legend
                              • Jan 2013
                              • 12093
                              • U.S.

                              #19
                              Ok, I thought someone must have put a long screw thru it, it's a hole, when I clicked the picture to enlarge it, looked like a solder blob with a tip on it but just an optical illusion.

                              Comment

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