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LG 20LC1RB lcd tv

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    #1

    LG 20LC1RB lcd tv

    hello everyone. been a while since i've posted here. i have rescued a lcd from the dump. symptoms are as follows.

    powers on ok. screen lights up. all button features work. after 5 - 10 minutes screen will go a little wonky. flashes dark, then blue, goes red, vertical lines. then it runs normal. it does this in intervals sometimes but always runs normal again. i got a couple pictures posted of the screen (sorry time for new camera) but i will post the guts soon. just thought if anyone has seen this before and what to look for inside. im thinking all caps are good as it goes haywire then works. thanks.
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    #2
    Re: LG 20LC1RB lcd tv

    Originally posted by starmaxpc View Post
    powers on ok. screen lights up. all button features work. after 5 - 10 minutes screen will go a little wonky. flashes dark, then blue, goes red, vertical lines. then it runs normal. it does this in intervals sometimes but always runs normal again.
    If you have a fan, try pointing a fan at the back to keep it cool and see if the picture goes wonky. If it runs fine for about 30 minutes with the fan, you know it is heat related.

    I would look for poor solder joints and chips getting hot.
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      #3
      Re: LG 20LC1RB lcd tv

      tried the fan method. no change. now it turns on ok with sound and it takes 15 - 20 minutes display to come on now. kind of similar to middle pic i posted but flashes like that for a bit when its ready to come on then it stays on.

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        #4
        Re: LG 20LC1RB lcd tv

        I would go through check all the onboard voltage regulators, if any overheats.
        Monitor the output voltage of the most suspected regulators, and see if a dropping voltage may occour when the screen go weird.

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          #5
          Re: LG 20LC1RB lcd tv

          Originally posted by starmaxpc View Post
          but i will post the guts soon.
          Pictures of the insides would help.
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            #6
            Re: LG 20LC1RB lcd tv

            Originally posted by retiredcaps View Post
            Pictures of the insides would help.
            as requested
            Attached Files

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              #7
              Re: LG 20LC1RB lcd tv

              Originally posted by starmaxpc View Post
              as requested
              Can we get pics of the backside (solder side) of both boards? Sometims poor solder joints are the cause of this. As the board/LCD warms up, the solder joints move/shift.
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                #8
                Re: LG 20LC1RB lcd tv

                Originally posted by retiredcaps View Post
                Can we get pics of the backside (solder side) of both boards? Sometims poor solder joints are the cause of this. As the board/LCD warms up, the solder joints move/shift.
                DOH .....sorry should have included those.
                Attached Files

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                  #9
                  Re: LG 20LC1RB lcd tv

                  Originally posted by starmaxpc View Post
                  DOH .....sorry should have included those.
                  It is hard to tell from the photos, but look for solder cracks like this

                  https://www.badcaps.net/forum/attach...0&d=1249633213

                  all over both boards. Sometimes a magnifying glass will help because you can't see everything with the naked eye.
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                    #10
                    Re: LG 20LC1RB lcd tv

                    ok will do. safe to say the power side is ok and the signal board side is the one to focus on as there is light showing but no display?

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