LG 42PA4500 mainboard LED codes

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  • DeniS182
    Badcaps Veteran
    • Jun 2014
    • 328
    • Slovakia

    #1

    LG 42PA4500 mainboard LED codes

    HI all,
    I have this TV , without picture,sound.. only LED on mainboard blinking all the time : 1 second blink, then 5 second nothing and then again 1 second blink and again, again...
    Have someone blink code table or something like that? Thanks for answer.
  • tom66
    EVs Rule
    • Apr 2011
    • 32560
    • UK

    #2
    Re: LG 42PA4500 mainboard LED codes

    Is that on control board, or on actual main board (with HDMI ports, etc.)
    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

    • DeniS182
      Badcaps Veteran
      • Jun 2014
      • 328
      • Slovakia

      #3
      Re: LG 42PA4500 mainboard LED codes

      It's on mainboard , board with all connectors like hdmi, scart etc.
      Led on front panel is turned off and nothing changed when I pushed start button or other buttons ..

      Comment

      • tom66
        EVs Rule
        • Apr 2011
        • 32560
        • UK

        #4
        Re: LG 42PA4500 mainboard LED codes

        I've never seen led like that on a newer LG plasma. It's not optical port or for Ethernet?
        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

        • DeniS182
          Badcaps Veteran
          • Jun 2014
          • 328
          • Slovakia

          #5
          Re: LG 42PA4500 mainboard LED codes

          It's not optical port or for ethernet.. I attached some photos.
          Attached Files

          Comment

          • tom66
            EVs Rule
            • Apr 2011
            • 32560
            • UK

            #6
            Re: LG 42PA4500 mainboard LED codes

            OK, what you can try and do is jumper the two holes marked EXT AUTO GEN on this board:
            https://www.badcaps.net/forum/attach...1&d=1421777971

            And disconnect LVDS (right most ribbon connector)

            Then plug TV into mains power.

            Do you get a sequence of test patterns appearing on the screen?
            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

            • abdekader
              Senior Member
              • Jul 2014
              • 73
              • Turkey

              #7
              Re: LG 42PA4500 mainboard LED codes

              i have the same TV check the Y-sus IGBT transistor shorts , but after i change it the same transistor shorts , this problem to me in all of kind of LG PLASMA Y-SUS T KIND
              something problem in it
              check 18v in Ysus
              Last edited by abdekader; 01-20-2015, 03:15 PM.
              Electronic Engineer from Syria,Aleppo

              Comment

              • DeniS182
                Badcaps Veteran
                • Jun 2014
                • 328
                • Slovakia

                #8
                Re: LG 42PA4500 mainboard LED codes

                tom66: I jumped these two holes and disconnect lvds cable too (ribbon cable with blue end), but nothing.. no picture. But LED on mainboard was off and LED on front of TV was ON and when I push start button , then this led turn off and again turn on and stay ON.
                abdekader: I'll check it tomorrow.

                Comment

                • DeniS182
                  Badcaps Veteran
                  • Jun 2014
                  • 328
                  • Slovakia

                  #9
                  Re: LG 42PA4500 mainboard LED codes

                  I didn't have time to work on this sooner.
                  Now I measured components on heatsink, on YSUS and some are short circuited. I can ask you how to remove board from tv? I unscrewed all screws, but I have problem with three connectors. I don't want damage it. Any idea to remove it without damage connectors / board?

                  Comment

                  • drussell
                    Senior Member
                    • Nov 2014
                    • 144
                    • Canada

                    #10
                    Re: LG 42PA4500 mainboard LED codes

                    It can take a fair bit of pulling force, yeah...

                    I generally use a pair of needlenose pliers, opened slightly and twist between the buffer board and the Y to help pry them apart while pulling. This is much kinder to the edge of the board than a screwdriver, for example, since the outside of needlenose pliers are generally rounded. Just be gentle and take your time.

                    If there is a spot that has the little protrusions from where the boards are snapped apart during manufacture and you need to pry them apart, do it there since it gives a bit of added protection to the edge of the board. If you ever run across ones that are really tight or have many connectors you can always shim in a little plastic against both boards when you stick something in there to pry them apart.
                    Last edited by drussell; 01-25-2015, 03:01 PM. Reason: typo

                    Comment

                    • DeniS182
                      Badcaps Veteran
                      • Jun 2014
                      • 328
                      • Slovakia

                      #11
                      Re: LG 42PA4500 mainboard LED codes

                      drussell: thank you for advice.
                      I found three short circuited components. First on heatsink Q709 - KF7N60 (N channel mosfet), second and third on bottom of pcb both in DPAK package. And I don't know what they are. You can see on photo of bottom PCB - eight components in dpak in a row and first and last are these short circuited. On first is written JF63K2 A3P 02 and on last is written F2A A1P 069. Have someone service manual/schematic of this TV or can help me with identification of these burned-out components? thanks for answer.
                      Attached Files
                      Last edited by DeniS182; 02-02-2015, 06:35 AM. Reason: .

                      Comment

                      • DeniS182
                        Badcaps Veteran
                        • Jun 2014
                        • 328
                        • Slovakia

                        #12
                        Re: LG 42PA4500 mainboard LED codes

                        I can't find schematic of this YSUS board. Can you help me?

                        Comment

                        • jamesb6
                          Member
                          • Nov 2012
                          • 20
                          • USA

                          #13
                          Re: LG 42PA4500 mainboard LED codes

                          I have one of these sets as well. It has the exact same behavior as DeniS182 tv. I have also found shorted components on the YSUS but my board has different ones shorted. My shorted FETs are Q734, Q735, Q736 and Q737. Two on the under side and two on the heat sink.

                          I suspect a new YSUS is the fix. Any advice?

                          Comment

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