Lg 60pg3000

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  • finntricky
    Badcaps Veteran
    • Jan 2014
    • 449
    • uk

    #1

    Lg 60pg3000

    hi, i think i know what my problem is, but just like an experts say on the matter.
    so i have 2 questions.
    the tv turns on with sound but no pic,so im saying y-sus and buffers,
    but, the screen is showing sparkles of red pixels,
    also there are 4 LED lights on the T-CON board, 3 are lit out of the 4, does anybody know if they indicate what the problem is ?
    thanks for your help
    mick
  • tom66
    EVs Rule
    • Apr 2011
    • 32560
    • UK

    #2
    Re: Lg 60pg3000

    The LEDs on the control board indicate the panel temperature, 3/4 lit is OK.
    Red sparkles can be a number of things - bad Y-sus but also a failure of the control board or main board.
    Have you tried jumpering the EXT AUTO GEN points on the control board?
    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

    • finntricky
      Badcaps Veteran
      • Jan 2014
      • 449
      • uk

      #3
      Re: Lg 60pg3000

      not as yet tom, the tv is all back together now, i'll have a look tomorrow and see if i can find the jump points, and get back to you.
      thanks,
      Last edited by finntricky; 06-15-2014, 03:20 PM.

      Comment

      • finntricky
        Badcaps Veteran
        • Jan 2014
        • 449
        • uk

        #4
        Re: Lg 60pg3000

        Originally posted by tom66
        The LEDs on the control board indicate the panel temperature, 3/4 lit is OK.
        Red sparkles can be a number of things - bad Y-sus but also a failure of the control board or main board.
        Have you tried jumpering the EXT AUTO GEN points on the control board?
        I'm posting a pic of board, as I can't find the points,
        Maybe you can point them out for me please.
        And do i just link the 2 points with a wire?
        Attached Files
        Last edited by finntricky; 06-16-2014, 12:30 PM.

        Comment

        • tom66
          EVs Rule
          • Apr 2011
          • 32560
          • UK

          #5
          Re: Lg 60pg3000

          The two points just below VS_DA point, I think marked AUTO GEN, bottom right of board.
          You also need to unplug top most connector going to main board - the LVDS cable.
          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

          • finntricky
            Badcaps Veteran
            • Jan 2014
            • 449
            • uk

            #6
            Re: Lg 60pg3000

            Originally posted by tom66
            The two points just below VS_DA point, I think marked AUTO GEN, bottom right of board.
            You also need to unplug top most connector going to main board - the LVDS cable.
            ok, found it, crossed the 2 points, and the screen still shows red pixel sparkling,
            nothing else seems to happen

            Comment

            • tom66
              EVs Rule
              • Apr 2011
              • 32560
              • UK

              #7
              Re: Lg 60pg3000

              OK next locate Vsc and -Vy voltages on the Y-sus board and check them. About 140V and -200V respectively. Leave the ext auto gen jumpers in place.
              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

              • finntricky
                Badcaps Veteran
                • Jan 2014
                • 449
                • uk

                #8
                Re: Lg 60pg3000

                Cant find Vsc found vy and voltage fluctuates from 130 upto 180 volts

                Comment

                • tom66
                  EVs Rule
                  • Apr 2011
                  • 32560
                  • UK

                  #9
                  Re: Lg 60pg3000

                  OK, pull out the buffer boards and repeat the test.
                  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

                  • finntricky
                    Badcaps Veteran
                    • Jan 2014
                    • 449
                    • uk

                    #10
                    Re: Lg 60pg3000

                    Now 186 volts drops to 182 then up to 186 again.
                    Now have blue & green pixels in top right & top left corners with a scattering of blue pixels over the rest of screen.
                    Last edited by finntricky; 06-16-2014, 03:58 PM.

                    Comment

                    • tom66
                      EVs Rule
                      • Apr 2011
                      • 32560
                      • UK

                      #11
                      Re: Lg 60pg3000

                      Good, try with just lower or upper buffer. The fault is with one of the buffer boards. I fixed a 42PG3000 with the same fault.
                      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

                      • finntricky
                        Badcaps Veteran
                        • Jan 2014
                        • 449
                        • uk

                        #12
                        Re: Lg 60pg3000

                        This is what i have now with buffer disconnected, this image flashes 4 to 5 times then screen goes black for 10 seconds then repeats flashing image again.
                        Attached Files

                        Comment

                        • tom66
                          EVs Rule
                          • Apr 2011
                          • 32560
                          • UK

                          #13
                          Re: Lg 60pg3000

                          Which buffer out? Odd image given one removed...
                          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

                          • finntricky
                            Badcaps Veteran
                            • Jan 2014
                            • 449
                            • uk

                            #14
                            Re: Lg 60pg3000

                            That was with 2 buffers disconnected,
                            when bottom disconnected same image on bottom half of screen only, the top half is black with red sparkling pixels as original with all connected.

                            Comment

                            • tom66
                              EVs Rule
                              • Apr 2011
                              • 32560
                              • UK

                              #15
                              Re: Lg 60pg3000

                              I am surprised you can get an image like that with both buffers out, did you completely unplug them from Y-sus? They are screwed in I think, so you need to undo the screws too, as they carry drive current.
                              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

                              • finntricky
                                Badcaps Veteran
                                • Jan 2014
                                • 449
                                • uk

                                #16
                                Re: Lg 60pg3000

                                Ok, will try that, i did not unscrew them will try that now.


                                When both buffer disconnected just black screen, not lit up.

                                When top buffer connected top half of screen lit up with red sparkling pixels.

                                When all buffer boards reconnected and now removed jumper from tcon board,
                                screen lights up no pixels are displayed, just a black screen.
                                Last edited by finntricky; 06-16-2014, 04:42 PM.

                                Comment

                                • tom66
                                  EVs Rule
                                  • Apr 2011
                                  • 32560
                                  • UK

                                  #17
                                  Re: Lg 60pg3000

                                  In all cases please also check -Vy voltage.
                                  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

                                  • finntricky
                                    Badcaps Veteran
                                    • Jan 2014
                                    • 449
                                    • uk

                                    #18
                                    Re: Lg 60pg3000

                                    Originally posted by tom66
                                    In all cases please also check -Vy voltage.
                                    never got a chance to test tonight, so will have another go tomorrow,
                                    but not sure if im testing the correct way or not,
                                    do i just test the 2 -vy points with tester or use chassie for neg, and test positive on both points on -vy.
                                    depends on how i test as to what the volts read.
                                    and also the buffers, you can only disconect both or the bottom, as the bottom buffer runs from conections from the top buffer.

                                    Comment

                                    • tom66
                                      EVs Rule
                                      • Apr 2011
                                      • 32560
                                      • UK

                                      #19
                                      Re: Lg 60pg3000

                                      Try with both out or only bottom in, that is OK for now.
                                      For -Vy test across the resistor marked.
                                      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

                                      • finntricky
                                        Badcaps Veteran
                                        • Jan 2014
                                        • 449
                                        • uk

                                        #20
                                        Re: Lg 60pg3000

                                        ok, tested across -vy and got no stable voltages with 1 or 2 buffers removed,
                                        seems like regaurdless of how many boards are connected to the y-sus the voltages do the same thing,
                                        only time i get anyware near stable is if i remove LDVS CABLE or AUTO GEN, so there is no output from a/v board or t-con, and just get black screen.
                                        im thinking bad t-con now.

                                        Comment

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