60PB5600 no picture

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  • Srtech
    Member
    • Jan 2017
    • 19
    • Canada

    #1

    60PB5600 no picture

    I am just learning about Plasma and LCD/LED TV's and have an LG 60PB5600 that turns on but no picture or menu. It does power up with a white screen flash. The blue indicator light on the front of the set flashes when I press the menu button, but no menu appears on the screen.

    The vs and va voltages are according to the label as are all voltages on the connector to the main board. (RL_on =3v)

    After reading other posts, I tried getting the test patterns but no success. I jumpered EXT_AUTO_GEN, unplugged the blue ribbon from the main board, unplugged P231 from the main board and jumpered RL_on to 5.2v. Then plugged the set in and turned it on, but all I got was flashing green LED on the control board.
    At first it was three short and one long pattern. Now it is four long flashes.

    Where do I go from here? Thanks for sharing your knowledge.
  • Hamie
    Badcaps Legend
    • Apr 2014
    • 1383
    • UK

    #2
    Re: 60PB5600 no picture

    Pictures of the boards?

    Need to check vsc and Vy test points on the ysus.

    Comment

    • Srtech
      Member
      • Jan 2017
      • 19
      • Canada

      #3
      Re: 60PB5600 no picture

      Ok so here are a set of pictures.

      Measurements are vsc on P152 is at 235.7 vdc, and vy on the test point is 85.4 vdc.
      Attached Files

      Comment

      • Srtech
        Member
        • Jan 2017
        • 19
        • Canada

        #4
        Re: 60PB5600 no picture

        Ok, so after looking at the other messages on this tv, I did more checking.

        Voltages on y-sus board at P152 connector are:
        Vpp = 235.2v
        Vsc = 235.2v
        5vf = 90v
        Sus_on = 85v

        On P151 at pin 7 there is "15vf" = 100v

        Va on the power supply = 54.7v and the same on the z-sus board.

        I checked the four igbts Q401, Q404, Q405 and Q406 and none are shorted but test as diodes.

        So should I be looking at a Main Board? I have white screen flashes at power up, and sound is working, just no picture or menus.

        Comment

        • Srtech
          Member
          • Jan 2017
          • 19
          • Canada

          #5
          Re: 60PB5600 no picture

          In addition Imchecked the following voltages at the power supply connector P813

          M_on = 3.06v
          RL_on = 3.1v
          5.2 = 5.2v
          17 = 17v

          AC_on = 5v
          17v_det = 2.5v
          VS_on = 3.07v
          vs_det = 2.5v

          Comment

          • Hamie
            Badcaps Legend
            • Apr 2014
            • 1383
            • UK

            #6
            Re: 60PB5600 no picture

            Remove buffer and recheck vy and vsc.

            Comment

            • Srtech
              Member
              • Jan 2017
              • 19
              • Canada

              #7
              Re: 60PB5600 no picture

              I am not sure where vy is accessible as I don't see a clear identification on the y-sus board.

              However at GR 170 = 84.7v
              And at GR250 = 271v, since they are marked as vy - and vy+ respectively, I assume vy is the difference of 187v. It is the same with the buffer disconnected.

              With buffer connected vsc = 235.3v measured at P152, but with the buffer disconnected vsc = 0v at P152.

              Comment

              • Hamie
                Badcaps Legend
                • Apr 2014
                • 1383
                • UK

                #8
                Re: 60PB5600 no picture

                No

                black probe to -
                Red probe to +

                Comment

                • ReeceyBurger123
                  Never Give Up !
                  • May 2014
                  • 7325
                  • Britain

                  #9
                  Re: 60PB5600 no picture

                  Originally posted by Hamie
                  No

                  black probe to -
                  Red probe to +
                  Good patients bud lol
                  Please Do Not PM My Page Asking For Help Badcaps Is The Place For Advise, Page Linked For Business Reasons Only. Anyone Doing So Will Be Banned Instantly !

                  https://www.facebook.com/Telford-Tel...7894576335359/

                  Comment

                  • Srtech
                    Member
                    • Jan 2017
                    • 19
                    • Canada

                    #10
                    Re: 60PB5600 no picture

                    Ok the vy voltage reads 187v DC and is the same with both buffers disconnected.

                    Comment

                    • Srtech
                      Member
                      • Jan 2017
                      • 19
                      • Canada

                      #11
                      Re: 60PB5600 no picture

                      Like this?
                      Attached Files

                      Comment

                      • Hamie
                        Badcaps Legend
                        • Apr 2014
                        • 1383
                        • UK

                        #12
                        Re: 60PB5600 no picture

                        Edit:

                        OK y-sus is probably OK.

                        When you first turn on the tv do you get a brief flash of the screen? Or does it always remain pitch black?
                        Last edited by Hamie; 02-08-2017, 10:59 AM.

                        Comment

                        • Hamie
                          Badcaps Legend
                          • Apr 2014
                          • 1383
                          • UK

                          #13
                          Re: 60PB5600 no picture

                          Do you see where the top buffer connects to the bottom buffer. (white flat cable)

                          There are some smd capacitors, can you tell if any are shorted?

                          Comment

                          • Srtech
                            Member
                            • Jan 2017
                            • 19
                            • Canada

                            #14
                            Re: 60PB5600 no picture

                            Yes I get the flash (prime as I have learned)

                            Comment

                            • Srtech
                              Member
                              • Jan 2017
                              • 19
                              • Canada

                              #15
                              Re: 60PB5600 no picture

                              Yes I see three caps and measure two at 0.01uf (shorted I assume) and one at 35uf. One is blown apart also!
                              Attached Files

                              Comment

                              • Hamie
                                Badcaps Legend
                                • Apr 2014
                                • 1383
                                • UK

                                #16
                                Re: 60PB5600 no picture

                                No probs, check those smd caps, that may be your only problem and you can fix this for practically nothing.

                                Comment

                                • Hamie
                                  Badcaps Legend
                                  • Apr 2014
                                  • 1383
                                  • UK

                                  #17
                                  Re: 60PB5600 no picture

                                  Too quick for me.

                                  No for this test put your meter in ohm.

                                  See if they are low resistance.

                                  I'm pretty sure the top one should be 4uf.
                                  Can't remember though I'll need to check.

                                  Comment

                                  • Srtech
                                    Member
                                    • Jan 2017
                                    • 19
                                    • Canada

                                    #18
                                    Re: 60PB5600 no picture

                                    Sounds good Hamie, thanks for spending some of your evening on this. What values should those smd caps be?

                                    Comment

                                    • Srtech
                                      Member
                                      • Jan 2017
                                      • 19
                                      • Canada

                                      #19
                                      Re: 60PB5600 no picture

                                      So for resistance two are open (C873 & C975) and C956 measures 5k.
                                      C873 is broken also.

                                      Comment

                                      • Hamie
                                        Badcaps Legend
                                        • Apr 2014
                                        • 1383
                                        • UK

                                        #20
                                        Re: 60PB5600 no picture

                                        Yeah I though it was just your photography that c873 is actually split in 2!

                                        The other 2 are probably OK.

                                        OK so change it out, give me few minutes I need to get the exact value.

                                        Comment

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