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

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    #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
    #2
    Re: Have a problem, LED Toshiba 50L4300U with Horizontal flickering lines

    Originally posted by kingdrako69 View Post
    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

      #3
      Re: Have a problem, LED Toshiba 50L4300U with Horizontal flickering lines

      Originally posted by newtothis View Post
      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

        #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

          #5
          Re: Have a problem, LED Toshiba 50L4300U with Horizontal flickering lines

          Originally posted by tom66 View Post
          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

            #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

              #7
              Re: Have a problem, LED Toshiba 50L4300U with Horizontal flickering lines

              Originally posted by tom66 View Post
              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

                #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

                  #9
                  Re: Have a problem, LED Toshiba 50L4300U with Horizontal flickering lines

                  Originally posted by lalin View Post
                  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

                    #10
                    Re: Have a problem, LED Toshiba 50L4300U with Horizontal flickering lines

                    Originally posted by lalin View Post
                    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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