LG lcd bumps at top of screen

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  • efwiofoi
    Senior Member
    • Nov 2013
    • 76
    • uk
    #1

    LG lcd bumps at top of screen

    i have a philips ambilight with an lg panel, there are dark bumps at the top of the screen. I've seen the same on lg panels, i think they are where the ribbon cables are. does anyone know what causes this, could it be cleaned off? i don't really want to dismantle the panel for fear of damaging something, but its quite noticeable. could i put a cotton bud between the layers and clean it without dismantling the panel fully?





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    • freakaftr8
      Badcaps Legend
      • Oct 2012
      • 3743
      • USA
      #2
      Re: LG lcd bumps at top of screen

      Wow same issue I had with a Magnavox 42 inch lcd. Whats the spots look like on a dark screen? Are they visible. Like white?
      are they more prominent when the tv is first turned on and then dissappear slowly?
      Last edited by freakaftr8; 12-20-2013, 10:20 AM.
      Did I leave the soldering iron on?

        Comment

        • efwiofoi
          Senior Member
          • Nov 2013
          • 76
          • uk
          #3
          Re: LG lcd bumps at top of screen

          they are visible on a white or light background, you cant see them when its dark, and stay the same however long its been on. i assume its a darkening of one of the layers, from airflow or something, but could be a permanent problem with the lcd? its a 47inch, my other one with this was a 47inch also.

          i wondered if i could go into the service menu and shift the picture down 5mm, that would hide most of it.
          Last edited by efwiofoi; 12-20-2013, 10:36 AM.

            Comment

            • tom66
              EVs Rule
              • Apr 2011
              • 32560
              • UK
              #4
              Re: LG lcd bumps at top of screen

              How long has the set been off? On some of these, it goes away once used for a couple of hours, if it is turned off for some time.
              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

                • newtothis
                  Badcaps Legend
                  • Mar 2013
                  • 1556
                  • england
                  #5
                  Re: LG lcd bumps at top of screen

                  got my eye on a sanyo with the same issue, though these disappear after time

                    Comment

                    • freakaftr8
                      Badcaps Legend
                      • Oct 2012
                      • 3743
                      • USA
                      #6
                      Re: LG lcd bumps at top of screen

                      Are we starting to see a trend here?
                      Last edited by freakaftr8; 12-20-2013, 06:49 PM.
                      Did I leave the soldering iron on?

                        Comment

                        • freakaftr8
                          Badcaps Legend
                          • Oct 2012
                          • 3743
                          • USA
                          #7
                          Re: LG lcd bumps at top of screen

                          All these doing this see if the panel is loose in the frame. That was the issue with mine. Over time the aging of the materials used to house the panel in the frame degradate causing the ribbons to not effectively get cooled by the metal frame and heat up faster than normal causing an influx of heat to the panel temporarily warping the surface causing this.
                          Last edited by freakaftr8; 12-20-2013, 06:50 PM.
                          Did I leave the soldering iron on?

                            Comment

                            • newtothis
                              Badcaps Legend
                              • Mar 2013
                              • 1556
                              • england
                              #8
                              Re: LG lcd bumps at top of screen

                              On the Sanyo the rings also turn white at the edges when on a black background

                                Comment

                                • freakaftr8
                                  Badcaps Legend
                                  • Oct 2012
                                  • 3743
                                  • USA
                                  #9
                                  Re: LG lcd bumps at top of screen

                                  Yes this was my symptom as well
                                  Did I leave the soldering iron on?

                                    Comment

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