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Vizio M420NV Display problem

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    #1

    Vizio M420NV Display problem

    This tv has a weird graphical problem shown in the picture on the left side of the tv. (i know the picture indicates the right side but i have the tv upside down since that's where the t-con and other display boards are.) My initial thought was a loose connection from the t-con board to the display board ( can't remember what they're called, it's the boards that are directly connected to the tv panel). sure enough when tugging on the cable on that side i would get a change in severity of the distortion. I did notice if i play more on the side that connects to the non t-con board, i get more of a response. This leads me to believe it has something to do with the connector on the display board. I also did swap the ribbon cables to see if i had a bad cable and it made no difference. Anyone have any thoughts as to a potential fix? I know generally when those boards get bad conenctions it's generally toast, but I didn't know with this type of connector if it would be any different. Or if it's something else im missing
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    #2
    Re: Vizio M420NV Display problem

    Go squeeze or flex the frame a little on top, bottom and sides. The idea is to move the tab bonds and see if the screen is clearing up. You can also only hook up one ribbon cable from the LCD to the TCon at a time and see what that gives.
    Does this go away after the TV warmed up, or is this always there?

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      #3
      Re: Vizio M420NV Display problem

      sorry i shoulkd've mentioned i did try messing with the frame a bit and didn't seem to make any difference. I haven't noticed a difference with time, I will check individualy pulling each ribbon cable for a difference and get back to you.

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        #4
        Re: Vizio M420NV Display problem

        be gentle on the tab bonds.

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          #5
          Re: Vizio M420NV Display problem

          Update: so there's a very smal lgap between the metal shielding and the lcd boards. I decided (yes i know this was crazy dangerous and probably stupid) i stuck a small flat head screwdriver and gently pushed down in various areas. Well i hit one area that i have pictured, and the distortion went out completely. It was then i noticed every so often a 1 pixel vertical line that stretches the whole screen randomly appears. So this was definitely a tab bond issue. I also know this i'm sure didn't permenantly fix the problem as the tab bond that was loose will come loose again and the problem will resurface. My question to everyone is, is there a way to 1. get a fairly reliable quick fix? 2. fix it permenantly with relative ease. 3 which is my better option?
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            #6
            Re: Vizio M420NV Display problem

            Take the frame apart and put some thing that keeps pressure between the tab bond and the outside frame. Some jammed / glued foam, rubber, or a heat sink mat in there.

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              #7
              Re: Vizio M420NV Display problem

              Success. I managed to "plug the hole" I fully reassembled the tv and still have a perfect picture. I know there's still the potential for issues to arise from this fix but so far so good. Thanks everyone for your help . I've seen a few people post on other websites about this exact issue so i'm hoping this can help people in the future
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                #8
                Re: Vizio M420NV Display problem

                good to hear!

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