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Advice on vertical lines/TAB bonds

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    #1

    Advice on vertical lines/TAB bonds

    Hi,

    I recently got an 40" Toshiba LCD TV. The seller said there was an intermittent issue with the sound but otherwise it was good.
    After getting it home I turned it on and left it switched on for a while, After approximately 30 minutes 2 thin verticle lines appeared.

    I know I can apply pressure to repair this but, I'd like to know if this could have happened through transporting it or is it just age related with hot/cold cycles, expanding and contracting the different metals in the bond. I was carefu getting it back and had it laid LCD sidedown flat on the bed in my campervan.

    Thanks
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    #2
    Re: Advice on vertical lines/TAB bonds

    usually if you didn't press on the screen and crack it or damaged in any way shape or form tab bond failure usually happens with just hot and cold cycles over use of time
    Did I leave the soldering iron on?

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      #3
      Re: Advice on vertical lines/TAB bonds

      That's what I thought. Just wanted to be sure. The guy I bought it from seemed to be in a hurry to get me out of the way, had the TV by the door so didn't offer to turn it on. It's from eBay, his feedback seemed good. Guess I'll send him a message and see if I can get some of the money back.

      Thanks for the help.

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        #4
        Re: Advice on vertical lines/TAB bonds

        Guessing you bought a Vestel crapper, the panels are well known to engage in spontaneous seppuku. Nothing you can do in most cases... panel has failed.
        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.

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          #5
          Re: Advice on vertical lines/TAB bonds

          Hi Tom,
          I like the Tesla pic. I went to Jodrell bank about a week ago. Afterwards I went to a place called Knutsford. I didn't realy like Knutsford much apart from the Tesla showroom. Didn't even know there were any in the north.
          The TV is an older Toshiba so is actually made by them. I was surprised how many through hole components were in there. I think that I can fix it, just annoyed about the seller not mentioning it and the extra time required for the repair :/

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            #6
            Re: Advice on vertical lines/TAB bonds

            It appears you were right Tom. Pressing the tabs made no difference. Nor did cleaning the TCON connectors. When I cooled down the edge of the panel where the line was it disappeared. So looks like an internal LCD fault?
            The seller has agreed to let me return it for a full refund. He said he tested it for a couple of hours before. I told him that it would depend on a number of factors including the temperature of the TV when it was turned on.
            I thought a TAB bond problem would be more common when dealing with a set with a vertical line? Maybe I was unlucky!

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