LG 43UK6090 no image

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  • alfatv
    Badcaps Veteran
    • Sep 2020
    • 353
    • Canada
    #1

    LG 43UK6090 no image

    Suspect bad panel, but looking for advices especially from those familiar with this model.
    TV is turning on, there is backlight and sound.
    The picture is grey.
    Main supply voltage to the panel (big electrolytic cap) is quickly is turning off after power up, but it stays on on if panel is disconnected.
    I checked for shorts, nothing obvious.
    There are few types of panels and main boards used in this model, mine is with 2 panel connectors inwards like here:

    https://www.ebay.com/itm/LG-EBU64868...M/363237919773
    Tags: None
    • Diah
      Badcaps Legend
      • Feb 2013
      • 6343
      • Germany
      #2
      Re: LG 43UK6090 no image

      99.9% panel cracked

        Comment

        • alfatv
          Badcaps Veteran
          • Sep 2020
          • 353
          • Canada
          #3
          Re: LG 43UK6090 no image

          No, it's not cracked, but I will double check inside.

            Comment

            • budm
              Badcaps Legend
              • Feb 2010
              • 40746
              • USA
              #4
              Re: LG 43UK6090 no image

              Please attach the pictures of the whole backside of the TV showing all the boards and the screen shot of the panel when TV is turned on so we can see what we are dealing with.
              Never stop learning
              Basic LCD TV and Monitor troubleshooting guides.
              http://www.badcaps.net/forum/showthr...956#post305956

              Voltage Regulator (LDO) testing:
              http://www.badcaps.net/forum/showthr...999#post300999

              Inverter testing using old CFL:
              http://www.badcaps.net/forum/showthr...er+testing+cfl

              Tear down pictures : Hit the ">" Show Albums and stories" on the left side
              http://s807.photobucket.com/user/budm/library/

              TV Factory reset codes listing:
              http://www.badcaps.net/forum/showthread.php?t=24809

                Comment

                • alfatv
                  Badcaps Veteran
                  • Sep 2020
                  • 353
                  • Canada
                  #5
                  Re: LG 43UK6090 no image

                  I removed the panel, no cracks at all.
                  See attached pictures, one of them shows lines when TV is turning on. After that it goes steady grey.
                  Image is always grey no matter what cable to panel is connected.
                  But power supply shuts down only if the right side (looking from the front) is connected.
                  Attached Files
                  Last edited by alfatv; 03-18-2021, 05:10 PM.

                    Comment

                    • dick_barton
                      Badcaps Legend
                      • Aug 2015
                      • 6642
                      • Wales
                      #6
                      Re: LG 43UK6090 no image

                      Can you post photos of the long thin circuit board connected to the lcd panel.
                      Willing to help but I'm no expert.

                        Comment

                        • alfatv
                          Badcaps Veteran
                          • Sep 2020
                          • 353
                          • Canada
                          #7
                          Re: LG 43UK6090 no image

                          Here is long board, 6 COFs total
                          Attached Files

                            Comment

                            • alfatv
                              Badcaps Veteran
                              • Sep 2020
                              • 353
                              • Canada
                              #8
                              Re: LG 43UK6090 no image

                              Just got image out of it with tape method.
                              Had to cover about 20 pins or so on the left side of connector.
                              Tried to cover less pins, but it either stops working or starts flickering or there are line patterns on the right side.
                              Experts, what's going on and what to do next?

                                Comment

                                • brucetv
                                  Badcaps Veteran
                                  • May 2015
                                  • 281
                                  • united states
                                  #9
                                  Re: LG 43UK6090 no image

                                  You have a short in one or more MLCC's on the lower driver boards for the panel. The UK series is plagued with this problem and you have to remove the shorted cap to get the panel to fire up. It's a slow pain in the ass process. Life is NOT good with LG crap panels.

                                    Comment

                                    • alfatv
                                      Badcaps Veteran
                                      • Sep 2020
                                      • 353
                                      • Canada
                                      #10
                                      Re: LG 43UK6090 no image

                                      Brucetv, thanks for advice, I already tried to to find shorted caps, bus was not able to.
                                      Are they dead short or somewhat leaking? Should I use resistance or diode check?
                                      Or do you mean removing them one by one?

                                        Comment

                                        • dick_barton
                                          Badcaps Legend
                                          • Aug 2015
                                          • 6642
                                          • Wales
                                          #11
                                          Re: LG 43UK6090 no image

                                          Set your meter to ohms and check for very low resistance close to very low to zero ohms
                                          Willing to help but I'm no expert.

                                            Comment

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