LG 60PV450-UA Flickering Green Lines (w/pics)

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  • bass_engine
    New Member
    • Jan 2014
    • 8
    • Canada
    #1

    LG 60PV450-UA Flickering Green Lines (w/pics)

    Hey guys, I have a little bit of electronics experience, but none with plasma TVs. Any ideas on where to start with this one?

    What happened:

    -Friend had his laptop connected via HDMI, everything was working normally.
    -Friend received a warning that his laptop battery was low
    -Friend plugged his laptop into the wall via his adapter.
    -TV immediately went dark and then started flickering with horizontal green lines like in the attached pictures.
    -Friend said 'oh shit.' A good way to sum it up, I think.

    Symptoms:

    -Green lines/boxes that move around the screen and flicker on and off. Sometimes the on screen display can be seen between the lines (like in the top left corner of the second picture) but sometimes the screen is totally dark.
    -Power comes on, speakers produce sound
    -I can change inputs, but the symptoms stay the same, even with no cables attached.

    Things I've checked:

    -Obvious stuff like fuses/burned chips. All the fuses tested fine.
    -No warped caps.
    -Ribbon cables all seem to be well-seated.

    Any ideas would be greatly appreciated!
    Attached Files
    Tags: None
    • freakaftr8
      Badcaps Legend
      • Oct 2012
      • 3743
      • USA
      #2
      Re: LG 60PV450-UA Flickering Green Lines (w/pics)

      Either that tv is a portal to the matrix or I would say that you have a control board issue possibly. Otherwise known as a logic board. Or a faulty mainboard. This is the center small board in the middle of the tv. Unplug tv and jumper the auto _ gen test mode. There will be two holes in the board for this. Then power up. Should see an array of colors and white bars going throughout the screen. Let us know what you find out.
      Last edited by freakaftr8; 01-06-2014, 11:06 PM.
      Did I leave the soldering iron on?

        Comment

        • bass_engine
          New Member
          • Jan 2014
          • 8
          • Canada
          #3
          Re: LG 60PV450-UA Flickering Green Lines (w/pics)

          Thanks, I will definitely try that when I get home tonight and report back.

          Big fan of the matrix, though. In a way I will be sad to see it fixed!

            Comment

            • freakaftr8
              Badcaps Legend
              • Oct 2012
              • 3743
              • USA
              #4
              Re: LG 60PV450-UA Flickering Green Lines (w/pics)

              Originally posted by bass_engine

              Big fan of the matrix, though. In a way I will be sad to see it fixed!
              Lol me too..
              Did I leave the soldering iron on?

                Comment

                • bass_engine
                  New Member
                  • Jan 2014
                  • 8
                  • Canada
                  #5
                  Re: LG 60PV450-UA Flickering Green Lines (w/pics)

                  Okay, so I just jumped auto_gen and ran the test patterns. Everything looks perfect to my eye, but I uploaded a video just in case. The streaky lines are all thanks to my unbelievably crappy blackberry. In person no flaws are visible.

                  Does that mean the logic/control board is probably okay?

                  Maybe a main board issue?

                  I really appreciate the help so far!

                    Comment

                    • freakaftr8
                      Badcaps Legend
                      • Oct 2012
                      • 3743
                      • USA
                      #6
                      Re: LG 60PV450-UA Flickering Green Lines (w/pics)

                      It's a bad mainboard. Replace it.

                      This is the Board that all the inputs connect to.
                      Did I leave the soldering iron on?

                        Comment

                        • tom66
                          EVs Rule
                          • Apr 2011
                          • 32560
                          • UK
                          #7
                          Re: LG 60PV450-UA Flickering Green Lines (w/pics)

                          The poor video quality is just an artefact of how plasmas work, I have a good camera and the flickering happens too. I concur with bad mainboard.
                          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.

                            Comment

                            • bass_engine
                              New Member
                              • Jan 2014
                              • 8
                              • Canada
                              #8
                              Re: LG 60PV450-UA Flickering Green Lines (w/pics)

                              You guys are amazing. I'll update the thread when I replace the part!

                                Comment

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