LG 55lv5500 bad picture no sound

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  • dorp90
    Member
    • Mar 2017
    • 11
    • USA

    #1

    LG 55lv5500 bad picture no sound

    I have an LG 55LV5500-UA.ausyljr that has a scrambled picture and no sound. From what I have read other places I'm thinking that I need to replace the main/logic board. Am I on the right track for this? I didn't see any capacitors that were swollen or anything like that.
    Attached Files
  • freakaftr8
    Badcaps Legend
    • Oct 2012
    • 3743
    • USA

    #2
    Re: LG 55lv5500 bad picture no sound

    No this model is known for faulty BGA connections on the mainboard. Take off the black heatsink off of the processor and heat up Ic 401 and 402. You can do this while the TV is on see if the picture straightens out.

    Tcon board is fine. It's just doing what is told
    Did I leave the soldering iron on?

    Comment

    • dorp90
      Member
      • Mar 2017
      • 11
      • USA

      #3
      Re: LG 55lv5500 bad picture no sound

      Just so I'm straight and do no further harm. When you say heat up Ic 401 & 402 are you talking about soldering them or just taking a heat gun at them? Thanks.

      Comment

      • freakaftr8
        Badcaps Legend
        • Oct 2012
        • 3743
        • USA

        #4
        Re: LG 55lv5500 bad picture no sound

        Heat gun. What I do is at the TV standing straight up so you can view the screen hit these two Ics with a bit of heat and then as you're watching the screen see if it straightens out
        Did I leave the soldering iron on?

        Comment

        • freakaftr8
          Badcaps Legend
          • Oct 2012
          • 3743
          • USA

          #5
          Re: LG 55lv5500 bad picture no sound

          There is another ic hiding underneath that black heat sync. Try that one as well
          Did I leave the soldering iron on?

          Comment

          • dorp90
            Member
            • Mar 2017
            • 11
            • USA

            #6
            Re: LG 55lv5500 bad picture no sound

            Just finished hitting it with the heat gun and the picture is all clear. Thank you very much. Just curious, what is it about the heat that helps?

            Comment

            • johnboy1313
              Badcaps Legend
              • Nov 2012
              • 1959
              • USA

              #7
              Re: LG 55lv5500 bad picture no sound

              There are very small solder connections that break over time. Heating these up, reflows the solder, restoring the connections.

              Comment

              • freakaftr8
                Badcaps Legend
                • Oct 2012
                • 3743
                • USA

                #8
                Re: LG 55lv5500 bad picture no sound

                May not last long thou. This repair takes extensive time and the right amount of reflow. Let us know how long it lasts. Don't put this board in the oven! It doesn't fair well.
                Did I leave the soldering iron on?

                Comment

                • dorp90
                  Member
                  • Mar 2017
                  • 11
                  • USA

                  #9
                  Re: LG 55lv5500 bad picture no sound

                  I had jumped the gun a little bit with my first reply that it was fixed. After I put it back together I had the same issue. So, I took it apart again and did some more heat and it has been running for a couple days now with no problems.

                  Comment

                  • Davi.p
                    Hobbist
                    • Sep 2009
                    • 4261
                    • Italy - Milan

                    #10
                    Re: LG 55lv5500 bad picture no sound

                    Heating a bit wil never fix a BGA chip, you need a reflowing, if you don't know what it is search the forum..

                    Comment

                    • diif
                      Badcaps Legend
                      • Feb 2014
                      • 6978
                      • England

                      #11
                      Re: LG 55lv5500 bad picture no sound

                      Even a reflow won't be a permanent repair. Reballing with leaded balls will be a much longer lasting fix.

                      Comment

                      • freakaftr8
                        Badcaps Legend
                        • Oct 2012
                        • 3743
                        • USA

                        #12
                        Re: LG 55lv5500 bad picture no sound

                        Sometimes you get lucky. I have the 47 inch version of this TV same problem been working great for a year-and-a-half after the reflow
                        Did I leave the soldering iron on?

                        Comment

                        • Daisyann15
                          New Member
                          • Sep 2018
                          • 1
                          • United states

                          #13
                          Re: LG 55lv5500 bad picture no sound

                          Hello! My LG 55lv5500 have no soud and dont recognize HDMI neither USB connection. Picture is fine. I remove the cover but looking main board Im not sure where to heat.
                          Attached Files

                          Comment

                          • tvtimmy
                            Badcaps Legend
                            • Mar 2015
                            • 1160
                            • usa

                            #14
                            Re: LG 55lv5500 bad picture no sound

                            Take the 4 push in spring loaded pins out of the big black heatsink. Then peel off the rubber pad if yours has one. Heat the chip with a heat gun on low for about 45 seconds. Watch a youtube video on reflow of bga chip to be sure of the time and temp to do it.

                            Comment

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