Have a problem, LED Toshiba 50L4300U with Horizontal flickering lines

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  • kingdrako69
    New Member
    • Jun 2014
    • 7
    • Canada
    #1

    Have a problem, LED Toshiba 50L4300U with Horizontal flickering lines

    Hi all, maybe someone could share some light on this problem...had the Tv for a couple years now, the other day the tv started to show horizontal flickering lines...from the top to about the middle of the screen. I have done some google research but basically haven't found anything on this matter other than firmware problem? Tv is updated to latest firmware, and even I have done factory reset from the installation menu the tv still has the same problem. I had also opened the tv and check capacitors, loose wires and haven't been able to notice anything. Have seen post and youtube videos where the screen turn off, but in my case it just flickers for a second or two, deem the screen...will be fine for another 15sec or so and it will do it again... it's annoying.
    Does anyone have any idea what could be wrong? is it my power board?
    Tags: None
    • newtothis
      Badcaps Legend
      • Mar 2013
      • 1556
      • england
      #2
      Re: Have a problem, LED Toshiba 50L4300U with Horizontal flickering lines

      Originally posted by kingdrako69
      Hi all, maybe someone could share some light on this problem...had the Tv for a couple years now, the other day the tv started to show horizontal flickering lines...from the top to about the middle of the screen. I have done some google research but basically haven't found anything on this matter other than firmware problem? Tv is updated to latest firmware, and even I have done factory reset from the installation menu the tv still has the same problem. I had also opened the tv and check capacitors, loose wires and haven't been able to notice anything. Have seen post and youtube videos where the screen turn off, but in my case it just flickers for a second or two, deem the screen...will be fine for another 15sec or so and it will do it again... it's annoying.
      Does anyone have any idea what could be wrong? is it my power board?
      Pictures or video will help

        Comment

        • kingdrako69
          New Member
          • Jun 2014
          • 7
          • Canada
          #3
          Re: Have a problem, LED Toshiba 50L4300U with Horizontal flickering lines

          Originally posted by newtothis
          Pictures or video will help

          Sorry I forgot to add some pictures, here are some unfortunately I am not able to load a video, it logs me out before the video uploading is complete; I had similar problems with the pictures but eventually it worked
          I uploaded youtube so here is the video link
          https://www.youtube.com/watch?v=kiPzNzu4XnM
          Attached Files

            Comment

            • tom66
              EVs Rule
              • Apr 2011
              • 32560
              • UK
              #4
              Re: Have a problem, LED Toshiba 50L4300U with Horizontal flickering lines

              Bad LCD panel.
              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

                • kingdrako69
                  New Member
                  • Jun 2014
                  • 7
                  • Canada
                  #5
                  Re: Have a problem, LED Toshiba 50L4300U with Horizontal flickering lines

                  Originally posted by tom66
                  Bad LCD panel.
                  But the lines are not visible when the flashing is not happening only when it flickers? was fine before the firmware....but thanks on your input

                    Comment

                    • tom66
                      EVs Rule
                      • Apr 2011
                      • 32560
                      • UK
                      #6
                      Re: Have a problem, LED Toshiba 50L4300U with Horizontal flickering lines

                      Firmware can't cause single pixel lines in my experience.
                      The flickering on and off has been seen to be a thermal-related LCD panel fault (something heats up, connection goes, it cools down, connection re-made, repeat...)
                      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

                        • kingdrako69
                          New Member
                          • Jun 2014
                          • 7
                          • Canada
                          #7
                          Re: Have a problem, LED Toshiba 50L4300U with Horizontal flickering lines

                          Originally posted by tom66
                          Firmware can't cause single pixel lines in my experience.
                          The flickering on and off has been seen to be a thermal-related LCD panel fault (something heats up, connection goes, it cools down, connection re-made, repeat...)
                          I see, thank you for the response...so there's no repair for this tv? Sometimes it flicker less when you unplug the tv for a while....but gets worse if lower the backlight

                            Comment

                            • lalin
                              M
                              • Apr 2015
                              • 20
                              • us
                              #8
                              Re: Have a problem, LED Toshiba 50L4300U with Horizontal flickering lines

                              I hate when somebody ask for photos or videos and you upload them and they dont even bother to comment after all that effort.

                                Comment

                                • kingdrako69
                                  New Member
                                  • Jun 2014
                                  • 7
                                  • Canada
                                  #9
                                  Re: Have a problem, LED Toshiba 50L4300U with Horizontal flickering lines

                                  Originally posted by lalin
                                  I hate when somebody ask for photos or videos and you upload them and they dont even bother to comment after all that effort.
                                  Was this comment for me? I did comment there's no solution.....basically the flickering is so bad now tv is unwatchable....I'm disappointed at toshiba...and it might not be related but all these problems started after the last firmware upgrade

                                    Comment

                                    • budm
                                      Badcaps Legend
                                      • Feb 2010
                                      • 40746
                                      • USA
                                      #10
                                      Re: Have a problem, LED Toshiba 50L4300U with Horizontal flickering lines

                                      Originally posted by lalin
                                      I hate when somebody ask for photos or videos and you upload them and they dont even bother to comment after all that effort.
                                      https://www.badcaps.net/forum/showthread.php?t=47423
                                      Never stop learning
                                      Basic LCD TV and Monitor troubleshooting guides.
                                      http://www.badcaps.net/forum/showthr...956#post305956

                                      Voltage Regulator (LDO) testing:
                                      http://www.badcaps.net/forum/showthr...999#post300999

                                      Inverter testing using old CFL:
                                      http://www.badcaps.net/forum/showthr...er+testing+cfl

                                      Tear down pictures : Hit the ">" Show Albums and stories" on the left side
                                      http://s807.photobucket.com/user/budm/library/

                                      TV Factory reset codes listing:
                                      http://www.badcaps.net/forum/showthread.php?t=24809

                                        Comment

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