50" LG sus problems??

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  • gaza007
    Member
    • Sep 2011
    • 38

    #1

    50" LG sus problems??

    Hello, Firstly, can I just add that before anyone get's too technical I'm a relatively handy person but no expert 'like yourselves' So if anyone would like to help please bare this in mind..

    My Mother and Father-in-law have a 50" LG Plasma tv, model number LG50PC1D. It went off a little while ago and so they bought a new one, I asked if I could have this to try and fix and heh presto.. here we are!

    The tv had a type of crystal pattern when turning on and the snow effect was flashing on and off and it had vertical lines randomly placing themselves on the screen.. I opened the back up and found the powerboard to have 9 caps which were blown, at that point I got the feeling it was a cheap repair .. However! After replacing all the bad caps with the more expensive Panasonic type, I switched the TV on and there was no change whatsoever..

    At which point I was a little stumped.. After a bit of research 'mainly from this site' I tracked it down to what I believed was the Y sustain board. After being a complete idiot I bought a 2nd hand one from a reputable electronics dealer on ebay. I have just fitted it tonight and the crystal problem along with the flashing snow has gone, but , the vertical line which moves only 3 segments from left to right then back to the start again is more prominant. I have tried adusting the ramp up/down and this made the picture certainly more clear but did not change the vertical line.

    After reading a little more about the Tv I have, some people say that because the X sustain board get's power from the Y it may have blown something in the X ?? Normally this is not the case as the X is totally seperate from the Y but not on this model TV..

    Any ideas??

    Please rember, if you ask me to try anything I'm a novice compared to you!
    Attached Files
  • gaza007
    Member
    • Sep 2011
    • 38

    #2
    Re: 50" LG sus problems??

    Pictures left to right..

    1. The vertical line that goes the to the 3 segment then returns back to the left hand side of the screen.

    2. The back of the Tv .. LOL

    3. The X sus board.

    4. The Y sus board.

    Comment

    • gaza007
      Member
      • Sep 2011
      • 38

      #3
      Re: 50" LG sus problems??

      You'll notice on the shot of the back of the Tv that there is a lead running from the Y sus board (left hand side) to the X sus board (right hand side). It runs just above the cooling fan.

      Comment

      • tom66
        EVs Rule
        • Apr 2011
        • 32560
        • UK

        #4
        Re: 50" LG sus problems??

        I think you are getting the X-main and Z-sustain confused; there is no such thing as an X-sustain. Samsung call the board an X-main. LG and a few others call it a Z-sustain. But whatever it is, usually a failed Z-sustain just causes a loss of brightness and maldischarge (very dark pixels on certain parts of the display, almost like looking through a fog.)

        Looks more like a Y-sustain failure or possibly an X buffer board failure. Note the X buffer boards are NOT driven by the X-main/Z-sustain or the Y-sustain.

        Often with these cheaper LG sets, the failure of the Y-sustain kills the buffers. The Z-sustain is rarely damaged by a Y-sustain failure.

        Q: Does the white bar move about the screen randomly or is it fixed?
        Last edited by tom66; 10-15-2011, 02:40 PM.
        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

        • gaza007
          Member
          • Sep 2011
          • 38

          #5
          Re: 50" LG sus problems??

          Hi Tom thank you for the reply.

          I could be wrong with the names it's just what I've seen others describe them as.
          The white vertical line goes in the 3 different positions like a traffic light system, so it isn't permanent in any one fixed position but does have a set pattern to where it goes to next.

          Are the buffer boards repairable or will I have to buy new ones? Cold it be old solder joints?

          Thanks again.

          Comment

          • tom66
            EVs Rule
            • Apr 2011
            • 32560
            • UK

            #6
            Re: 50" LG sus problems??

            Originally posted by gaza007
            Hi Tom thank you for the reply.

            I could be wrong with the names it's just what I've seen others describe them as.
            The white vertical line goes in the 3 different positions like a traffic light system, so it isn't permanent in any one fixed position but does have a set pattern to where it goes to next.

            Are the buffer boards repairable or will I have to buy new ones? Cold it be old solder joints?

            Thanks again.
            Sometimes a bad Y-sustain kills the Y buffers, so you could be looking at new Y buffers. The X buffers may be okay.

            I am not very good with plasmas so I will ask someone else to verify my diagnosis.
            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

            • PlainBill
              Badcaps Legend
              • Feb 2009
              • 7034
              • USA

              #7
              Re: 50" LG sus problems??

              What do you get when you hit the 'Menu' button?

              Have you tried hooking it up to an audio / video source and stepping through the inputs?

              PlainBill
              For a number of reasons, both health and personal, I will no longer be active on this board. Any PMs asking for assistance will be ignored.

              Never be afraid to try something new. Remember, amateurs built the ark. Professionals built the Titanic.

              Comment

              • gaza007
                Member
                • Sep 2011
                • 38

                #8
                Re: 50" LG sus problems??

                I'll try now Bill. I hadn't even put a source to it before now as couldn't even get the normal sure effect interference.

                Comment

                • gaza007
                  Member
                  • Sep 2011
                  • 38

                  #9
                  Re: 50" LG sus problems??

                  Hi, No picture coming from any source and no menu/volume or programme info while pressing the relevant buttons.

                  When pressing the source button it seems to affect the vertical bars and their position. on the screen. They have also started to go all the way across in segments rather than just the left hand side portion of the tv..

                  Comment

                  • PlainBill
                    Badcaps Legend
                    • Feb 2009
                    • 7034
                    • USA

                    #10
                    Re: 50" LG sus problems??

                    Eureka!!! Google LG 50pc1dr Troubleshooting manual. It's available on both scribd and Elektrotanya.

                    Of particular interest is page 45. By unplugging the LVDS cable from the logic board and placing a jumper across P1 it will generate a test pattern.

                    PlainBill
                    For a number of reasons, both health and personal, I will no longer be active on this board. Any PMs asking for assistance will be ignored.

                    Never be afraid to try something new. Remember, amateurs built the ark. Professionals built the Titanic.

                    Comment

                    • gaza007
                      Member
                      • Sep 2011
                      • 38

                      #11
                      Re: 50" LG sus problems??

                      Thanks Bill. There are two pictures which look like the problems I'm ' having, one referring to the control board 'as you suggested' and the other to a connection between the y board and the buffer. I've checked this connection and can't see any problems at all..but this connection produces the waves so s ems like a possibilit.. I'm now trying to get to control panel but have noticed only 1 green led light on instead of around 4, so I'm presuming the control board is bust..

                      Comment

                      • PlainBill
                        Badcaps Legend
                        • Feb 2009
                        • 7034
                        • USA

                        #12
                        Re: 50" LG sus problems??

                        Originally posted by gaza007
                        Thanks Bill. There are two pictures which look like the problems I'm ' having, one referring to the control board 'as you suggested' and the other to a connection between the y board and the buffer. I've checked this connection and can't see any problems at all..but this connection produces the waves so s ems like a possibilit.. I'm now trying to get to control panel but have noticed only 1 green led light on instead of around 4, so I'm presuming the control board is bust..
                        Not the control panel, the main logic card. And it seems to be readily accessible. See attachment.

                        PlainBill
                        Attached Files
                        For a number of reasons, both health and personal, I will no longer be active on this board. Any PMs asking for assistance will be ignored.

                        Never be afraid to try something new. Remember, amateurs built the ark. Professionals built the Titanic.

                        Comment

                        • gaza007
                          Member
                          • Sep 2011
                          • 38

                          #13
                          Re: 50" LG sus problems??

                          I thought that was the control board! heh heh. I'm going to take it out today when the kids are out of the way and get one ordered..

                          Comment

                          • gaza007
                            Member
                            • Sep 2011
                            • 38

                            #14
                            Re: 50" LG sus problems??

                            I meant to ask... Would the Logic board create the TV to look as it does on pg59 of that trouble shooting manual?? It's the 2nd picture from the left.

                            Comment

                            • PlainBill
                              Badcaps Legend
                              • Feb 2009
                              • 7034
                              • USA

                              #15
                              Re: 50" LG sus problems??

                              Something doesn't make sense to me; however I've never worked with this particular model plasma TV. I'd suggest you wait for others to chime in before ordering anything.

                              The picture you identified corresponds to a bad connection between the Y-Sustain and the upper buffer. At first glance, it looks to me like it is a bad Z-Sustain, however LG built this panel and should certainly know how it works. I'd look very carefully at the cable connected to P3, and the areas of the Y-Sustain and upper Y-buffer where it connects.

                              PlainBill
                              For a number of reasons, both health and personal, I will no longer be active on this board. Any PMs asking for assistance will be ignored.

                              Never be afraid to try something new. Remember, amateurs built the ark. Professionals built the Titanic.

                              Comment

                              • gaza007
                                Member
                                • Sep 2011
                                • 38

                                #16
                                Re: 50" LG sus problems??

                                Seems strange also why there should have been so many bad caps on the power board.. Could this have led to failure somewhere perhaps??

                                Comment

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