Lg 50PA6500 No picture

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  • HARDINGBOY
    Member
    • Aug 2014
    • 14
    • USA
    #1

    Lg 50PA6500 No picture

    I have a 50PA6500 I bought broken to repair. It doesnt show anything on the screen. The seller said they were watching tv one day and they heard a sound and the video stopped. They say they still heard audio but I dont know if thats the truth or not but I will tell you what Ive seen.

    I replaced the 2 y buffers on the left (connected to the y sustain), the power supply board, the z sustain, and the y sustain board but no luck. I hit the power button and im not even sure if it turns on all the way because no video is showing so I dont even know what input or channel its stuck on or if its turning on.

    Before I started replacing parts I heard it make a clicking noise when I would hit power but now it doesnt make the noise and it seems like its on but no video. I see a red light that stays solid on the main unit board (if thats the name of the board with the video inputs) I also see a green light that blinks on and off on the main logic control board. I dont know what else to do.

    I also dont know if the power button light is supposed to do anything on the front because I never saw what it looked like working. My other tvs have a solid green or solid red light in front when turned on.
    Tags: None
    • selldoor
      Slow Learner
      • Dec 2010
      • 7870
      #2
      Re: Lg 50PA6500 No picture

      What experience do you have of repairing Tvs
      Do you have multimeter and soldering equipment.
      Have you read the third sticky at the top of this forum
      Please upload pictures using attachment function when ask for help on the repair
      http://www.badcaps.net/forum/showthread.php?t=39740

        Comment

        • HARDINGBOY
          Member
          • Aug 2014
          • 14
          • USA
          #3
          Re: Lg 50PA6500 No picture

          I fix a lot of things. I have a little experience on tvs. I fixed a different plasma tv before but I changed 1 board and I was done. I have a multimeter but I have ony used it to fix xbox 360s. I never used it on anything else. I have been working on this tv off and on for a month.

            Comment

            • selldoor
              Slow Learner
              • Dec 2010
              • 7870
              #4
              Re: Lg 50PA6500 No picture

              Read this:https://www.badcaps.net/forum/showth...t=30067&page=1
              lots of ideas in there. plus in the ref library there is Tom66s guide to plasma tvs
              Please upload pictures using attachment function when ask for help on the repair
              http://www.badcaps.net/forum/showthread.php?t=39740

                Comment

                • HARDINGBOY
                  Member
                  • Aug 2014
                  • 14
                  • USA
                  #5
                  Re: Lg 50PA6500 No picture

                  Originally posted by selldoor
                  Read this:https://www.badcaps.net/forum/showth...t=30067&page=1
                  lots of ideas in there. plus in the ref library there is Tom66s guide to plasma tvs
                  I read that post before I made this one but he did not replace all the parts I replaced. As for the ref library everything for lg says expired on the 4th. The link went to nothing.

                    Comment

                    • tom66
                      EVs Rule
                      • Apr 2011
                      • 32560
                      • UK
                      #6
                      Re: Lg 50PA6500 No picture

                      There are a few common faults on this unit. One of them is a bad plasma panel caused by screws eating into the panel ribbons. (Design flaw!) Try running your TV with only the bottom buffer board installed. If you get a part picture (will be somewhat distorted or fuzzy) then you probably have a bad plasma panel.
                      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

                        • HARDINGBOY
                          Member
                          • Aug 2014
                          • 14
                          • USA
                          #7
                          Re: Lg 50PA6500 No picture

                          Originally posted by tom66
                          There are a few common faults on this unit. One of them is a bad plasma panel caused by screws eating into the panel ribbons. (Design flaw!) Try running your TV with only the bottom buffer board installed. If you get a part picture (will be somewhat distorted or fuzzy) then you probably have a bad plasma panel.
                          So you are saying test it by disconnecting the y buffers from everything

                            Comment

                            • tom66
                              EVs Rule
                              • Apr 2011
                              • 32560
                              • UK
                              #8
                              Re: Lg 50PA6500 No picture

                              Just the top one, and you only need to undo the white connectors.
                              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

                                • HARDINGBOY
                                  Member
                                  • Aug 2014
                                  • 14
                                  • USA
                                  #9
                                  Re: Lg 50PA6500 No picture

                                  Originally posted by tom66
                                  Just the top one, and you only need to undo the white connectors.
                                  You said if I get a fuzzy picture the panel is bad but what if its still no picture

                                    Comment

                                    • tom66
                                      EVs Rule
                                      • Apr 2011
                                      • 32560
                                      • UK
                                      #10
                                      Re: Lg 50PA6500 No picture

                                      Something else may be wrong.
                                      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

                                        • HARDINGBOY
                                          Member
                                          • Aug 2014
                                          • 14
                                          • USA
                                          #11
                                          Re: Lg 50PA6500 No picture

                                          Originally posted by tom66
                                          There are a few common faults on this unit. One of them is a bad plasma panel caused by screws eating into the panel ribbons. (Design flaw!) Try running your TV with only the bottom buffer board installed. If you get a part picture (will be somewhat distorted or fuzzy) then you probably have a bad plasma panel.
                                          I tried to test it with the white connectors off but i still saw nothing. Later I plugged the white connectors back in with the power cord disconnected and I saw a spark come out the white connector. Still no change what do I do?

                                            Comment

                                            • tom66
                                              EVs Rule
                                              • Apr 2011
                                              • 32560
                                              • UK
                                              #12
                                              Re: Lg 50PA6500 No picture

                                              You might have a different fault then, could you repeat the test, but leave the TOP board installed and remove the bottom one?
                                              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

                                                • HARDINGBOY
                                                  Member
                                                  • Aug 2014
                                                  • 14
                                                  • USA
                                                  #13
                                                  Re: Lg 50PA6500 No picture

                                                  Originally posted by tom66
                                                  You might have a different fault then, could you repeat the test, but leave the TOP board installed and remove the bottom one?
                                                  Are you talking about removing the connectors of the z buffer

                                                    Comment

                                                    • selldoor
                                                      Slow Learner
                                                      • Dec 2010
                                                      • 7870
                                                      #14
                                                      Re: Lg 50PA6500 No picture

                                                      Did you ever read this
                                                      https://www.badcaps.net/forum/showthread.php?t=18542&
                                                      Please upload pictures using attachment function when ask for help on the repair
                                                      http://www.badcaps.net/forum/showthread.php?t=39740

                                                        Comment

                                                        • HARDINGBOY
                                                          Member
                                                          • Aug 2014
                                                          • 14
                                                          • USA
                                                          #15
                                                          Re: Lg 50PA6500 No picture

                                                          Originally posted by tom66
                                                          You might have a different fault then, could you repeat the test, but leave the TOP board installed and remove the bottom one?
                                                          I tried but still nothing on the screen.

                                                            Comment

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