LG 46LD550-ub White Screen & No Sound

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  • blucube
    Member
    • Oct 2014
    • 10
    • USA
    #1

    LG 46LD550-ub White Screen & No Sound

    I know there have been a couple of these. I'm not the best tech, as someone said I'm more of a youtube-repairman ;p

    However, I picked this TV up that was going to be recycled. I've repaired a PSU on a Samsung a couple of times by soldering some new caps to replace some blown ones. However, I'm trying to boil down to what component maybe the issue. Initially after some google searching I thought it maybe the TCON. I picked one up on ebay and it's on it's way. However I did a little more troubleshooting...

    I plugged my laptop and an ethernet cable into the eth jack. The lights on the eth jack flickered just fine. I also plugged my laptop in HDMI. The laptop recognized it and downloaded some drivers. However, the laptop could never really stay in LCD+HDMI. It kept attempting to then would switch back to LCD. back and forth, TV didn't do anything. When I push the vol/ch/menu buttons nothing really happens either. I guess there is a little LED in the lower right hand corner that may or may not blink when you press the buttons.

    So, even though the mainboard is getting power and is some what functional... it doesn't appear to be... fully functional. Unless somehow this could be caused by a faulty TCON board but I'm not really sure if that makes sense...

    I have a multimeter on the way tomorrow I can test the PSU with. However my experiences in the past with PSU's generally if they're going bad the TV may light up and show the power LED, but will click back and forth when trying to turn on.

    Any opinions or troubleshooting Tips? Should I just wait for the meter reads and the TCON to come in Monday? Or should I just drop the money on the mainboard now if it's evident the mainboard is the suspect?

    I left the TCON out of the picture as ones on the way, plus nothing out of the ordinary really stood out on it.

    Thanks!
    Attached Files
    Tags: None
    • budm
      Badcaps Legend
      • Feb 2010
      • 40746
      • USA
      #2
      Re: LG 46LD550-ub White Screen & No Sound

      You cannot see any wash out image at all? Testing T-CON board will be the starting point. Did you check the voltages on the T-CON?
      Last edited by budm; 10-02-2014, 09:35 PM.
      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

        • blucube
          Member
          • Oct 2014
          • 10
          • USA
          #3
          Re: LG 46LD550-ub White Screen & No Sound

          Thanks for the reply. Nope, no images. There is a faint line right down the center. I'll have multimeter to test a bit more tomorrow.

            Comment

            • budm
              Badcaps Legend
              • Feb 2010
              • 40746
              • USA
              #4
              Re: LG 46LD550-ub White Screen & No Sound

              Please post the picture of the T-CON board.
              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

                • tibimakai
                  Badcaps Legend
                  • Jan 2012
                  • 3680
                  • USA
                  #5
                  Re: LG 46LD550-ub White Screen & No Sound

                  Did you try connecting a playing source and try pushing the input, until you hear sound?
                  I may even jump to the playing source, after start up.
                  I have repaired one of these with different issue a while ago and it was the mainboard.
                  I'm trying to convince somebody to sell her 60" one, with slow startup, which I believe to be capacitor issue.

                    Comment

                    • blucube
                      Member
                      • Oct 2014
                      • 10
                      • USA
                      #6
                      Re: LG 46LD550-ub White Screen & No Sound

                      Originally posted by budm
                      Please post the picture of the T-CON board.
                      Added

                      Originally posted by tibimakai
                      Did you try connecting a playing source and try pushing the input, until you hear sound?
                      I may even jump to the playing source, after start up.
                      I have repaired one of these with different issue a while ago and it was the mainboard.
                      I'm trying to convince somebody to sell her 60" one, with slow startup, which I believe to be capacitor issue.
                      I was actually going to attempt to do this with the laptop. However, that resulted in the laptop detecting the TV and it continually sourcing back and forth from LCD and LCD+HDMI. The laptop sourcing that is. I suppose that could be a driver issue... I'll try again with the roku or some thing.

                      Also, on my Samsung it takes like 3-5 seconds to boot up. Likely because the caps I got were from radio shack and a little bigger than oem. At least it boots though!
                      Attached Files

                        Comment

                        • tibimakai
                          Badcaps Legend
                          • Jan 2012
                          • 3680
                          • USA
                          #7
                          Re: LG 46LD550-ub White Screen & No Sound

                          Slow startup is in minutes, not seconds. Seconds is normal startup.
                          I use a WD Live Streamer, with a playing movie.

                            Comment

                            • blucube
                              Member
                              • Oct 2014
                              • 10
                              • USA
                              #8
                              Re: LG 46LD550-ub White Screen & No Sound

                              So just an update. Multimeter will be here Tuesday. TCON Monday...

                                Comment

                                • blucube
                                  Member
                                  • Oct 2014
                                  • 10
                                  • USA
                                  #9
                                  Re: LG 46LD550-ub White Screen & No Sound

                                  Just wanted to update. I got my multimeter and TCON. Readings at the PSU and Main board were good. I even got readings off the TCON but I wasn't exactly sure how to gauge those... however I replaced the TCON and that resolved my issue.

                                  Thanks everyone!

                                    Comment

                                    • budm
                                      Badcaps Legend
                                      • Feb 2010
                                      • 40746
                                      • USA
                                      #10
                                      Re: LG 46LD550-ub White Screen & No Sound

                                      Thanks for the good news.
                                      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

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