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mitsubishi lt52246 transparent blue line on right side of screen.

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    #1

    mitsubishi lt52246 transparent blue line on right side of screen.

    Hello friends!

    Starting my next LCD project.

    I got a mitsubishi lt52246, it takes a little bit to turn on, once it's on there is a transparent blue line on the right side of the screen, it seems to disappear when the scenes are light, as you can see in the photo below.

    There was also a solid yellow/green pixel wide line on the left side but it went away after being on for about 20 min.

    This a bad panel or possible t-con issue? I pushed on the putter edges of the screen and it didn't affect anything.

    I am actually pretty impressed with this unit, besides it's affliction it's got an excellent picture and the 120hz motion engine is super smooth compared to some of the others I have played with.




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    #2
    Re: mitsubishi lt52246 transparent blue line on right side of screen.

    Here is a photo showing the line gone / cut in half with a lighter contrast scene.

    The image behind the blue line seems a little solarized.

    Comment

      #3
      Re: mitsubishi lt52246 transparent blue line on right side of screen.

      looks like a tab bond issue at the top ribbons that attached to the glass face.
      You'll have to remove the metal frame around the lcd to access them and see if that is what it is
      Applying mild pressure to the ribbon should show if it is that, as this will cause them to change the image if it is that.

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        #4
        Re: mitsubishi lt52246 transparent blue line on right side of screen.

        Feared that, I will see what I can do. If it's that and it can go away I might that shop jimmy bike tube shim trick.

        I think it's worth a shot on this panel.

        Comment

          #5
          Re: mitsubishi lt52246 transparent blue line on right side of screen.

          bike tube trick ???
          I usually use the foam pads that are coated with a grayish cloth tape for pads.
          There may even be some of those on the frame already that can be rearranged or moved around. On the one 30 inch, I move this pad from the top to the front and it fixes it right up.

          certain size wire shrink tubing might work ?? I never tried that

          some guys use thermal pads but I find them too stiff and hard to get just the right thickness. Last time I tried that it was too thick and caused light bleeding in screensaver because the pressure was too great, so I went back to foam pads.

          On one, the actual metal frame was touching the top of the ribbon just enough to cause a pixel line issue, so I cut a section of the metal frame out just over that ribbon, and applied heat resistant tape to the outside to keep dust out.

          Do not reheat the ribbon to try to get it to readhere, this usually loosens more up

          Comment

            #6
            Re: mitsubishi lt52246 transparent blue line on right side of screen.

            The bike tube deal was someone cutting up a bike tube in rectangle bits to fit the length of the ribbon tab.

            The rubber can take the heat as well as be flexible enough to smash between the metal and tab.

            First thing first, need to see if it's actually the cause but I am sure it is

            Comment

              #7
              Re: mitsubishi lt52246 transparent blue line on right side of screen.

              I actually have some 1/4" thick Foam Dynamat for dampening cars for road noise I might try that.

              Its supposed to be high temp too as you can apply it in your engine bay on the fire wall and with most FWD cars the exhaust is on the back of the motor so its worth a shot

              Comment

                #8
                Re: mitsubishi lt52246 transparent blue line on right side of screen.

                Draught-excluder foam strip is good on some of them....
                TELEFIX

                How PLASMA SCREENS WORK, X-SUS and Y-SUS what they do--
                http://www.irf.com/technical-info/appnotes/an-1088.pdf
                PLEASE DO NOT EMAIL ME PRIVATELY FOR REPAIR ADVICE. QUESTIONS BELONG ON THE FORUM!

                Comment

                  #9
                  Re: mitsubishi lt52246 transparent blue line on right side of screen.

                  ^ thanks

                  Anyone here ever had one of these taken apart? I don't really see a whole lot of information on repairs outside of a few minor details and defiantly no internal shots.

                  Comment

                    #10
                    Re: mitsubishi lt52246 transparent blue line on right side of screen.

                    Here is the spec sheet on the foam I want to try for this tab bond fix, it says it can with stand temps up to -30f - 200f / -34c - 93c.

                    I have 1/4th and half inch thickness at my disposal.

                    https://cdn.badcaps-static.com/pdfs/...590ca2c9cc.pdf

                    Comment

                      #11
                      Re: mitsubishi lt52246 transparent blue line on right side of screen.

                      Fixed the blue line, the other side is a failure of the ic and got worse. Time to recycle.

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