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    LG 60PV450-UA Troubleshooting

    Greetings people smarter with circuity then myself

    I recently bought myself a broken plasma tv for cheap in hopes of using it as a learning experience seeing as I've never taken a tv apart before.

    The tv is an LG 60PV450-UA.

    With all components installed the following sequence happens when I hit the power button:
    I hear a click, the red standby light turns off for a second then reilluminates only to fade out, hear another click. About six seconds later another 2 clicks in a row and the red light illuminates.

    I disconnected the YSUS board and the some events happened.

    I plugged back in the YSUS board and unplugged the ZSUS board from the power board and the TV powered up. The image is visible but looks almost burned, I attached a photo.

    Since the tv stayed on with the ZSUS board unplugged I checked the voltages I could which are:

    VS TP - 202v (listed - 201v)
    VA TP - 55v (listed - 55v)
    VSC - 148v

    I suspect this is all normal because the ZSUS board is unplugged.

    On the ZSUS board which came with the TV there was a bit of burning on one of the copper coils so I bought a new ZSUS board but the symptoms are the same.

    To the best of what I can tell there are two options, either the ZSUS board I purchased is broken, or there is something else wrong with the tv.

    If I could get some troubleshooting advice I would greatly appreciate it. I've looked over all the boards and it doesn't look like any of the capacitors are bulging and I checked continuity on all the fuses.
    Attached Files

    #2
    Re: LG 60PV450-UA Troubleshooting

    Try this, Unplug the LVDS cable from the Controller Board to the Mainboard. (while the unit is off and unplugged) (all boards need to be plugged in Y/X ect)

    There is a spot on the controller board that you can jump with a piece of wire (Pins R51 and R52) that will bring up the test patterns when you plug the unit back in and turn it on.

    Honestly, it looks like you got a bad Xmain to me, check the solider joints on the back of the board on the 3 Copper inductor coils.
    Last edited by Shinju; 02-17-2015, 03:42 PM.

    Comment


      #3
      Re: LG 60PV450-UA Troubleshooting

      I unplugged the LVDS cable which I assume is the one shown unplugged in the picture attached, jumperd out pins R51 and R52, plugged in the TV but the symptoms are the same as when the everything is plugged in, I hear relays clicking but the TV won't turn on.
      Attached Files

      Comment


        #4
        Re: LG 60PV450-UA Troubleshooting

        As for the solder joints on the back of the main board on the 3 Copper inductor coils, upon visual inspection they seem to be in good shape.

        Comment


          #5
          Re: LG 60PV450-UA Troubleshooting

          The LVDS is the blue ended larger white ribbon cable, did you have it unplugged?

          Also, what is that plug hanging at the top of the photo? If that is connected to the PS to the Controller board plug it back in :P

          Then re run the test above.
          Last edited by Shinju; 02-17-2015, 04:11 PM.

          Comment


            #6
            Re: LG 60PV450-UA Troubleshooting

            That plug hanging was the plug I thought you were referring to. I plugged that back in, unplugged the large blue ended ribbon cable, kept the jumper in, but the symptoms stayed the same.

            Comment


              #7
              Re: LG 60PV450-UA Troubleshooting

              Can you show us how you made the jumper?
              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


                #8
                Re: LG 60PV450-UA Troubleshooting

                Also take a full shot of the entire back if your panel too please.

                Comment


                  #9
                  Re: LG 60PV450-UA Troubleshooting

                  For a jumper I used a little piece of bent metal, it shows continuity from R51 to R52.

                  I also attached a picture of the entire back.
                  Attached Files

                  Comment


                    #10
                    Re: LG 60PV450-UA Troubleshooting

                    So to establish what you have done, you only got the distorted picture of the menu system with the Xmain unplugged? So the Controller board/Mainboard is working.

                    Do the same jumper test with the Xmain unplugged.

                    Comment


                      #11
                      Re: LG 60PV450-UA Troubleshooting

                      I unplugged the Xmain board, left the LVDS cable from the Controller Board to the Mainboard unplugged, and the jumper in. I powered up the tv and it is running through the test sequence, with distorted image.

                      Comment


                        #12
                        Re: LG 60PV450-UA Troubleshooting

                        Interesting, when I was troubleshooting mine I couldnt get anything to show up with the Xmain out of circuit.

                        To me it looks like your Xmain is bad.

                        Get some voltage readings off your Ysus while the test patterns are going.

                        You will see VSCN and VY test points with + and - pads touch your probes to those points and see what your are getting.

                        Use the photo below as a guide, your voltages will be posted on the inside of your panel.
                        Attached Files

                        Comment


                          #13
                          Re: LG 60PV450-UA Troubleshooting

                          The voltages I got are as follows:
                          VY is -178.5. Listed voltage is -178.
                          VSC is 149.6, listed is 150.

                          Comment


                            #14
                            Re: LG 60PV450-UA Troubleshooting

                            ok, your Ysus is fine.

                            Seems like you got a bad Xmain, unfortunatly those are not easy to get right now lol seems everyone is buying them up or charging an obscene amounts for em.

                            Comment


                              #15
                              Re: LG 60PV450-UA Troubleshooting

                              Thats unfortunate, this is the board I bought to replace the one it came with, it appears I was sold a broken board. I'll email the manufacturer, hopefully they can send a new one.

                              Comment


                                #16
                                Re: LG 60PV450-UA Troubleshooting

                                Yeah, I would get on it ASAP. Did you get if off ebay or a website?

                                Also you can use either revision of Xmain on your panel too BTW.

                                Part Number EBR73561701
                                MFR Part Number 1 LG EBR73561701
                                Board Number(s) EAX64232101
                                Panel Sticker Number PDP60R30110

                                Or

                                Part Number EBR67820001
                                MFR Part Number 1 LG EBR67820001
                                Board Number(s) EAX62076601
                                Panel Sticker Number PDP60R30000

                                Comment


                                  #17
                                  Re: LG 60PV450-UA Troubleshooting

                                  Just to confirm, the Xmain is the same as the ZSUS, correct?

                                  Comment


                                    #18
                                    Re: LG 60PV450-UA Troubleshooting

                                    Originally posted by evilpiper View Post
                                    Just to confirm, the Xmain is the same as the ZSUS, correct?
                                    Yep, different name same function
                                    X-main is Samsung terminology
                                    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


                                      #19
                                      Re: LG 60PV450-UA Troubleshooting

                                      Thanks for clarifying. I bought it directly from "Encompass Supply Chain Solutions." I just submitted an RMA.

                                      Comment


                                        #20
                                        Re: LG 60PV450-UA Troubleshooting

                                        Originally posted by evilpiper View Post
                                        Thanks for clarifying. I bought it directly from "Encompass Supply Chain Solutions." I just submitted an RMA.
                                        Thought Encompass only sold new boards, factory direct. Maybe I'm thinking of someone else?

                                        You can usually get LG parts fairly cheap from them, seem to remember new Y-buffers $60 each, which whilst pricey compared to most used ones, isn't too bad for a new part...
                                        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

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