LG 20LC1RB lcd tv

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  • starmaxpc
    Senior Member
    • Oct 2009
    • 117
    #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.
    Attached Files
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    • retiredcaps
      Badcaps Legend
      • Apr 2010
      • 9271
      #2
      Re: LG 20LC1RB lcd tv

      Originally posted by starmaxpc
      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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        Comment

        • starmaxpc
          Senior Member
          • Oct 2009
          • 117
          #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.

            Comment

            • PowerAmpFreak
              Badcaps Veteran
              • Feb 2010
              • 982
              • Sweden
              #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.

                Comment

                • retiredcaps
                  Badcaps Legend
                  • Apr 2010
                  • 9271
                  #5
                  Re: LG 20LC1RB lcd tv

                  Originally posted by starmaxpc
                  but i will post the guts soon.
                  Pictures of the insides would help.
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                  If you are new to this forum, we can help a lot more if you please post clear focused pictures (max resolution 2000x2000 and 2MB) of your boards using the manage attachments button so they are hosted here. Information and picture clarity compositions should look like this post.

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                    Comment

                    • starmaxpc
                      Senior Member
                      • Oct 2009
                      • 117
                      #6
                      Re: LG 20LC1RB lcd tv

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

                        Comment

                        • retiredcaps
                          Badcaps Legend
                          • Apr 2010
                          • 9271
                          #7
                          Re: LG 20LC1RB lcd tv

                          Originally posted by starmaxpc
                          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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                            Comment

                            • starmaxpc
                              Senior Member
                              • Oct 2009
                              • 117
                              #8
                              Re: LG 20LC1RB lcd tv

                              Originally posted by retiredcaps
                              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

                                Comment

                                • retiredcaps
                                  Badcaps Legend
                                  • Apr 2010
                                  • 9271
                                  #9
                                  Re: LG 20LC1RB lcd tv

                                  Originally posted by starmaxpc
                                  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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                                  If you are new to this forum, we can help a lot more if you please post clear focused pictures (max resolution 2000x2000 and 2MB) of your boards using the manage attachments button so they are hosted here. Information and picture clarity compositions should look like this post.

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                                  Please do not post inline and offsite as they slow down the loading of pages.

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                                    Comment

                                    • starmaxpc
                                      Senior Member
                                      • Oct 2009
                                      • 117
                                      #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?

                                        Comment

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