Strange LG TV issue : Image vertical lines in black screen

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  • Ancient1
    Badcaps Veteran
    • Dec 2019
    • 275
    • Israel

    #1

    Strange LG TV issue : Image vertical lines in black screen

    Hi

    Asking for a friend.

    I'm used to black vertical line in otherwise good image - probable solution is a rubber to push and tighten the COFs bonding.
    but here its the opposite !

    TV has new T-con = same issue
    A missing panel voltage would have global effect

    So , what should one do ? how can I find where the fault is ?

    Thanks !
    Attached Files
  • EazyBone
    Badcaps Legend
    • Jun 2023
    • 1306
    • United states

    #2
    Panel short it appears. I would say it's dead.

    Comment

    • Ancient1
      Badcaps Veteran
      • Dec 2019
      • 275
      • Israel

      #3
      Thx EazyBone

      Turns out the guy has 3 ( 3 ) of that Model with SAME issue. I asked him to note the production date , might be (emerging) known issue.
      For now , I sent him to look for fluctuating VGH VGL LCx..

      Comment

      • Diah
        Badcaps Legend
        • Feb 2013
        • 6350
        • Germany

        #4
        this LG EBT64022702 Main Board with ONE SoC knowing issue with BGA at SoC

        Comment

        • EazyBone
          Badcaps Legend
          • Jun 2023
          • 1306
          • United states

          #5
          Originally posted by Diah
          this LG EBT64022702 Main Board with ONE SoC knowing issue with BGA at SoC
          It'll cause lines like that?

          Comment

          • nomoresonys
            Badcaps Legend
            • Jan 2013
            • 12086
            • U.S.

            #6
            It can, many things can make strange lines, bad tcon, bad cap, tvs diode etc.

            Comment

            • Diah
              Badcaps Legend
              • Feb 2013
              • 6350
              • Germany

              #7
              Originally posted by EazyBone

              It'll cause lines like that?
              yes. exactly these lines at the middle are SoC BGA

              Comment

              • nomoresonys
                Badcaps Legend
                • Jan 2013
                • 12086
                • U.S.

                #8
                Thanks Diah, I bet many tvs wound up thrown out only needing mainboard replace/repair. I remember SO many times that certain member, not Easybone but the one that always gives bad harmful advice telling everyone bad panel all the time.

                Comment

                • Ancient1
                  Badcaps Veteran
                  • Dec 2019
                  • 275
                  • Israel

                  #9
                  Originally posted by Diah
                  this LG EBT64022702 Main Board with ONE SoC knowing issue with BGA at SoC
                  Thx ! it does make sense because these are image ( production lines ) lines and not no_image ( usually dark / black ) lines.

                  Does reflowing work ? or is it a faulty IC ?

                  I'll try to reflow and report here

                  Comment

                  • Ancient1
                    Badcaps Veteran
                    • Dec 2019
                    • 275
                    • Israel

                    #10
                    test

                    Comment

                    • Ancient1
                      Badcaps Veteran
                      • Dec 2019
                      • 275
                      • Israel

                      #11
                      LG 49SM5KB

                      Reflow = No change.
                      New T-con .

                      Could it be Firmware corruption issue ( Logo appears etc ofc )
                      Attached Files

                      Comment

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