LG 55LE8500 the legendary TV is off. Help

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  • markolino
    Senior Member
    • Mar 2020
    • 108
    • Slovenia
    #1

    LG 55LE8500 the legendary TV is off. Help

    hello I own these two legendary TVs.
    but I have the same problem on both.. tv turns on but no picture
    when I opened the TV, I encountered complicated electronics. I don't know where to start looking for the reason why there is no picture.. how to turn on the led light? but whatever..
    If anyone understands this TV, I would appreciate it if you could help me revive it in some way.
    because it makes no sense to me to put them in the trash because they have a wonderful picture

    below you have a picture and a video.!

    https://youtu.be/gXuXMCwsLHE
    Attached Files
    Tags: None
    • tvtimmy
      Badcaps Legend
      • Mar 2015
      • 1160
      • usa
      #2
      Re: LG 55LE8500 the legendary TV is off. Help

      The cpu under the heatsink needs to be re-balled with leaded solder balls. You can heat up the cpu with a heat gun for about 45 seconds and see if it comes back on, but this will not fix the problem for very long. The cpu is on the mainboard (where all the inputs like HDMI are).

        Comment

        • markolino
          Senior Member
          • Mar 2020
          • 108
          • Slovenia
          #3
          Re: LG 55LE8500 the legendary TV is off. Help

          it's true. tried 45 seconds per gun at max. and wola here are the pictures.. so you should do a reflow on the processor.

          this tv has a fantastic phenomenally beautiful picture. because I can't believe what I'm seeing..
          how come such an old tv has such a fantastic picture ???
          is this tv mini led?? because the ice fades away where there is blackness..
          behaves like the current new mini ice. which is fascinating

          bit now I have 1 more problem.. the motherboard from the 47 inch model does not work on the 55 inch model..
          the original 55 inch panel was smoked. I don't know why, but this chip got damaged
          see the picture..

          Is there any option to upgrade the motherboard from the 47LE8500 model to the 55LE8500???

          because if I had to put a TV in the trash, I'd rather throw away the 47-inch model..
          Attached Files
          Last edited by markolino; 05-15-2023, 03:01 PM.

            Comment

            • markolino
              Senior Member
              • Mar 2020
              • 108
              • Slovenia
              #4
              Re: LG 55LE8500 the legendary TV is off. Help

              Does anyone know how to make the motherboard work on a 55 inch?

                Comment

                • snowangel27
                  Member
                  • Aug 2023
                  • 45
                  • United Kingdom
                  #5
                  Re: LG 55LE8500 the legendary TV is off. Help

                  My tv model is lg 55ub850v. My psu got 5 led light flashing and measured the 28 pins port on psu and the 24 pins port on mainboard, it had 3.5v and 12v+24v when pushed the button to turn on tv but the voltage on f2 fuse of t con s only 0.895v. And the backlight s totally off, so the led strips need to be replaced, right?

                    Comment

                    • snowangel27
                      Member
                      • Aug 2023
                      • 45
                      • United Kingdom
                      #6
                      Re: LG 55LE8500 the legendary TV is off. Help

                      Originally posted by tvtimmy
                      The cpu under the heatsink needs to be re-balled with leaded solder balls. You can heat up the cpu with a heat gun for about 45 seconds and see if it comes back on, but this will not fix the problem for very long. The cpu is on the mainboard (where all the inputs like HDMI are).
                      My tv had no backlight and already check voltage on psu+mb+tcon. I got 3.5v, 12v, 24v on psu and mb too, 0.895v on f1 fuse t con
                      Attached Files

                        Comment

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