LG 50PS60 Sound but no picture Ysus board EBR6183001

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  • goldbird78
    Senior Member
    • Feb 2018
    • 188
    • canada

    #41
    Re: LG 50PS60 Sound but no picture Ysus board EBR6183001

    see pic's
    Originally posted by tom66
    No worries.
    Post a clear, detailed shot of your Y-sustain board and I'll highligth what you need to poke at.
    Attached Files

    Comment

    • tom66
      EVs Rule
      • Apr 2011
      • 32560
      • UK

      #42
      Re: LG 50PS60 Sound but no picture Ysus board EBR6183001

      I need one of the opposite side of this showing the white connectors
      https://www.badcaps.net/forum/attach...8&d=1520190112
      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

      • goldbird78
        Senior Member
        • Feb 2018
        • 188
        • canada

        #43
        Re: LG 50PS60 Sound but no picture Ysus board EBR6183001

        Here you go
        Attached Files

        Comment

        • goldbird78
          Senior Member
          • Feb 2018
          • 188
          • canada

          #44
          Re: LG 50PS60 Sound but no picture Ysus board EBR6183001

          these one may be better
          Attached Files

          Comment

          • tom66
            EVs Rule
            • Apr 2011
            • 32560
            • UK

            #45
            Re: LG 50PS60 Sound but no picture Ysus board EBR6183001

            Ok you'll want to probe either side of that green resistor on the left hand side...just near the silver capacitor and the big red capacitor, and the text "SOLDERING"

            Settings for probe: Switch to 10X (if switchable), if not check the probe says 10X (making it a fixed 10X probe which is fine), black lead on probe connected to the chassis of the TV, the frame near the Y-buffer board usually works ok. Probe on the points mentioned above.

            Settings for scope: Trace focused and centred (use beam finder if available). Trig auto mode. 10V/div (equivalent to 100V/div on 10X) for channel 1, with probe connected to channel 1. Sweep on channel 1, turn off dual/chop mode. Time 500us/div. If there is a 10X scale for the horizontal, turn it OFF. Coupling for trigger DC. Coupling for channel should also be DC.

            When the set turns on, you should see something filling the screen. It won't be stable for now, but we need the second probe to sort that out. Hopefully you have one. If not, we will need to try to find the best trigger setting to get a stable display.
            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

            • goldbird78
              Senior Member
              • Feb 2018
              • 188
              • canada

              #46
              Re: LG 50PS60 Sound but no picture Ysus board EBR6183001

              attached is my scope, i cant find some of the settings you recommend.
              Attached Files

              Comment

              • goldbird78
                Senior Member
                • Feb 2018
                • 188
                • canada

                #47
                Re: LG 50PS60 Sound but no picture Ysus board EBR6183001

                Attached is what the scope was reading before and after the resistor. And my Oscilloscope settings below and in picture. Yes I do have a second probe.

                Ch1 set to DC
                Volts/div set to 20 and middle knob pulled out for x5
                Vert mode Ch1
                Sweep mode Norm
                Slope Positive
                Coupling DC
                Source Ch1
                A Sec/Dev set to 50 and middle knob pulled for x10
                B Sec/Dev Set to .5 but know idea what this should be or what it does.
                Hor mode A
                Attached Files

                Comment

                • tom66
                  EVs Rule
                  • Apr 2011
                  • 32560
                  • UK

                  #48
                  Re: LG 50PS60 Sound but no picture Ysus board EBR6183001

                  Set sweep to Auto.

                  Hor mode to "A"
                  Vert mode to CH1

                  Set all "CAL" dials to calibrated position (until they click at CAL)

                  Trigger source to CH1

                  I think "A" time is most important on this scope, "B" time is only for delay time, and not relevant for this application.
                  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

                  • goldbird78
                    Senior Member
                    • Feb 2018
                    • 188
                    • canada

                    #49
                    Re: LG 50PS60 Sound but no picture Ysus board EBR6183001

                    Done. attached is what I am getting on the scope before and after the resister

                    Originally posted by tom66
                    Set sweep to Auto.

                    Hor mode to "A"
                    Vert mode to CH1

                    Set all "CAL" dials to calibrated position (until they click at CAL)

                    Trigger source to CH1

                    I think "A" time is most important on this scope, "B" time is only for delay time, and not relevant for this application.
                    Attached Files

                    Comment

                    • tom66
                      EVs Rule
                      • Apr 2011
                      • 32560
                      • UK

                      #50
                      Re: LG 50PS60 Sound but no picture Ysus board EBR6183001

                      OK, show me what you get at 5ms/div...starting to look more reasonable now.

                      Can you also attach a pic of your control board. Need to locate the VS_DA point.
                      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

                      • goldbird78
                        Senior Member
                        • Feb 2018
                        • 188
                        • canada

                        #51
                        Re: LG 50PS60 Sound but no picture Ysus board EBR6183001

                        See pic

                        Originally posted by tom66
                        OK, show me what you get at 5ms/div...starting to look more reasonable now.

                        Can you also attach a pic of your control board. Need to locate the VS_DA point.
                        Attached Files

                        Comment

                        • tom66
                          EVs Rule
                          • Apr 2011
                          • 32560
                          • UK

                          #52
                          Re: LG 50PS60 Sound but no picture Ysus board EBR6183001

                          OK, your VS_DA point is just to the right of the main big chip on that board.
                          Show me the 5ms/div trace and we'll go from there.
                          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

                          • goldbird78
                            Senior Member
                            • Feb 2018
                            • 188
                            • canada

                            #53
                            Re: LG 50PS60 Sound but no picture Ysus board EBR6183001

                            Here you go. Thx

                            Originally posted by tom66
                            OK, your VS_DA point is just to the right of the main big chip on that board.
                            Show me the 5ms/div trace and we'll go from there.
                            Attached Files

                            Comment

                            • tom66
                              EVs Rule
                              • Apr 2011
                              • 32560
                              • UK

                              #54
                              Re: LG 50PS60 Sound but no picture Ysus board EBR6183001

                              wait, was that the plasma Y-sustain output or VS_DA?
                              Think I may have confused you - still want you to probe Y-sustain output - but keep an eye on VS_DA for future uses...just need to make sure you're all set up first...
                              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

                              • goldbird78
                                Senior Member
                                • Feb 2018
                                • 188
                                • canada

                                #55
                                Re: LG 50PS60 Sound but no picture Ysus board EBR6183001

                                previous was the VS_DA, Attached is the Y on both sides of the resistor.

                                Originally posted by tom66
                                wait, was that the plasma Y-sustain output or VS_DA?
                                Think I may have confused you - still want you to probe Y-sustain output - but keep an eye on VS_DA for future uses...just need to make sure you're all set up first...
                                Attached Files

                                Comment

                                • tom66
                                  EVs Rule
                                  • Apr 2011
                                  • 32560
                                  • UK

                                  #56
                                  Re: LG 50PS60 Sound but no picture Ysus board EBR6183001

                                  Cool, that's looking a lot better
                                  OK, now hook up the channel 2 of the scope up to VS DA.
                                  Set trigger source to channel 2
                                  Set trigger coupling to AC and set the trigger level to the centre position (zero)

                                  The waveform should now be a lot more stable, is it?

                                  You may want to find a way to keep the probe on VS-DA...such as soldering a wire to the pad or a nearby component or enlisting a trusted helper...
                                  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

                                  • goldbird78
                                    Senior Member
                                    • Feb 2018
                                    • 188
                                    • canada

                                    #57
                                    Re: LG 50PS60 Sound but no picture Ysus board EBR6183001

                                    Done, It looks a little better but I noticed there is not much difference when I remove the probe from VS DA

                                    Originally posted by tom66
                                    Cool, that's looking a lot better
                                    OK, now hook up the channel 2 of the scope up to VS DA.
                                    Set trigger source to channel 2
                                    Set trigger coupling to AC and set the trigger level to the centre position (zero)

                                    The waveform should now be a lot more stable, is it?

                                    You may want to find a way to keep the probe on VS-DA...such as soldering a wire to the pad or a nearby component or enlisting a trusted helper...
                                    Attached Files

                                    Comment

                                    • tom66
                                      EVs Rule
                                      • Apr 2011
                                      • 32560
                                      • UK

                                      #58
                                      Re: LG 50PS60 Sound but no picture Ysus board EBR6183001

                                      OK, now set the time base to 1ms/div.
                                      We want to see a waveform that is "locked" in time. So the scope starts at the same point on the waveform every time.
                                      An oscilloscope normally uses a trigger signal, like VS_DA, to synchronise the scan of the electron beam across the display.
                                      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

                                      • goldbird78
                                        Senior Member
                                        • Feb 2018
                                        • 188
                                        • canada

                                        #59
                                        Re: LG 50PS60 Sound but no picture Ysus board EBR6183001

                                        Ok, I have also included a .1 & .2 ms/div. See pic's

                                        Originally posted by tom66
                                        OK, now set the time base to 1ms/div.
                                        We want to see a waveform that is "locked" in time. So the scope starts at the same point on the waveform every time.
                                        An oscilloscope normally uses a trigger signal, like VS_DA, to synchronise the scan of the electron beam across the display.
                                        Attached Files
                                        Last edited by goldbird78; 03-07-2018, 07:29 AM.

                                        Comment

                                        • tom66
                                          EVs Rule
                                          • Apr 2011
                                          • 32560
                                          • UK

                                          #60
                                          Re: LG 50PS60 Sound but no picture Ysus board EBR6183001

                                          Are you sure your probe is set to 10X? As the waveform does not look correct for a 10V/div setting. It is way too large - should only be filling around four squares vertically on the display. Also, check the CAL dial for the respective channel is locked in the CAL position.
                                          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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