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    LG 55LW5700 Service Manual

    Hi all,

    Having a problem with an LG 55LW5700-TA. It won't turn on. Showing a solid red led. Has anyone a service manual to diagnose the problem. I'm thinking the power supply is fine. Possibly a problem with another of the cards.
    Last edited by UND312DOG; 04-05-2016, 08:43 PM.

    #2
    Re: LG 55LW5700 Service Manual



    Wait until GET MANUAL appears!!!
    regards thoma

    Comment


      #3
      Re: LG 55LW5700 Service Manual

      Originally posted by thoma View Post

      Wait until GET MANUAL appears!!!
      regards thoma
      Thanks heaps mate.

      You wouldnt happen to know the diagnostic codes for the red standby light are?

      Comment


        #4
        Re: LG 55LW5700 Service Manual

        Ok. So I turn the tv on. Get a faint relay click, but the tv dosent turn on. All im getting is the red standby led slowly flashing and fading. it just does it over and over. I hit the power button again and the same thing. Faint relay click, then the flashing led.

        Any ideas?

        Comment


          #5
          Re: LG 55LW5700 Service Manual

          Anyone

          Had a look at the main board. Model LD12C EAX64405501 (0). Ran through the diagnostic as per the service manual. All voltages were normal. Though I couldn't access Q507 as it was on the back of the board.

          Before the screen blanked out. It went purple, flashed, came back to normal then blacked out.
          Last edited by UND312DOG; 04-07-2016, 02:06 AM.

          Comment


            #6
            Re: LG 55LW5700 Service Manual

            http://alpengeist-tvrepair.blogspot....-clicking.html

            Perhaps?I know other lcd-tv!

            Comment


              #7
              Re: LG 55LW5700 Service Manual

              Cheers mate. Cant help to try.

              Comment


                #8
                Re: LG 55LW5700 Service Manual

                Ok. So I have gone through the service manual and tested each output on the main board. Everything seems to be within spec. I'm getting power but no picture. So I guess it has something to do with the t-con board.

                I know the tcon is getting power via lvds from Q507 12v. It's measuring 12v at Q507 and L511.

                How do I test the tcon board. I can't find any schematics anywhere. The tcon board model is LG 6870C-0369C Ver 0.2 (2675E1).

                Anything else I'm missing.

                Comment


                  #9
                  Re: LG 55LW5700 Service Manual

                  So just to be sure, do you have backlights? and backlights are staying on after the flash?
                  Pictures of the boards to see what we are dealing with?
                  Last edited by budm; 04-08-2016, 07:07 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


                    #10
                    Re: LG 55LW5700 Service Manual

                    I turn the tv on via the switch. Hear the relay click. And nothing. A completely black screen. No light at all. The only light showing is a slowly flashing red standby light.

                    Comment


                      #11
                      Re: LG 55LW5700 Service Manual

                      Well we need to see the board and especially around the power supply connectors so we can give you the test points to find out what are missing.
                      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


                        #12
                        Re: LG 55LW5700 Service Manual

                        Main
                        Attached Files

                        Comment


                          #13
                          Re: LG 55LW5700 Service Manual

                          Power
                          Attached Files

                          Comment


                            #14
                            Re: LG 55LW5700 Service Manual

                            BTW, did you check out that inductor in that link? And able to force on the backlights and power supply?
                            http://alpengeist-tvrepair.blogspot....-clicking.html
                            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


                              #15
                              Re: LG 55LW5700 Service Manual

                              Yeah mate. I'm getting 24v.

                              Comment


                                #16
                                Re: LG 55LW5700 Service Manual

                                And backlights?
                                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


                                  #17
                                  Re: LG 55LW5700 Service Manual

                                  So from p501 Pin 4 = 24.8v
                                  L504 to ground (both sides) = 24.8v
                                  Continuity either side of L504. And continuity from inlet side of L504 to L1801. Which is where it goes on the board.

                                  Comment


                                    #18
                                    Re: LG 55LW5700 Service Manual

                                    As for back lights. Looking at the panel front on is completely black.

                                    Comment


                                      #19
                                      Re: LG 55LW5700 Service Manual

                                      I'm not sure where to test on the board for the backlights.

                                      Comment


                                        #20
                                        Re: LG 55LW5700 Service Manual

                                        In the link thoma provided, it shows you how to get the backlights to come on using resistors, you can look at the front or the back of the panel to see if it has glowing lights in the darkened room.
                                        Right now we want to know if we have more than one board problem.
                                        Last edited by budm; 04-08-2016, 09:41 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

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