Plasma LG 50PS60 Screen Problem

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  • Brutis4555
    Member
    • Jun 2014
    • 20
    • United States

    #1

    Plasma LG 50PS60 Screen Problem

    My 50" plasma LG TV's color goes out after having it on for a few minutes. It turns to light color with pink or purple hew. I know from reading other threads that I need to test the voltage on the different boards but I need help knowing where to test it and how much it should read.

    Thank you in advance for your help!
    Attached Files
    Last edited by Brutis4555; 06-12-2014, 10:02 PM.
  • Caleb
    Smokin IC's
    • Feb 2013
    • 645
    • USA

    #2
    Re: Plasma LG 50PS60 Screen Problem

    Concentrate on that board on the far right side. Known as the xsustain, failure will often appear as pink hue across screen.
    Liberating magic smoke one part at a time

    Comment

    • Brutis4555
      Member
      • Jun 2014
      • 20
      • United States

      #3
      Re: Plasma LG 50PS60 Screen Problem

      How do I test it?

      Comment

      • Caleb
        Smokin IC's
        • Feb 2013
        • 645
        • USA

        #4
        Re: Plasma LG 50PS60 Screen Problem

        you might check the inductors down the center for poor soldering (on the bottom of the board), I recall lg had a problem with this previously.
        Liberating magic smoke one part at a time

        Comment

        • Brutis4555
          Member
          • Jun 2014
          • 20
          • United States

          #5
          Re: Plasma LG 50PS60 Screen Problem

          I have looked at that and I didn't find anything that looked out of place. Also I can leave the TV off for a long period of time and then it will work for a bit and then it goes bad again. Usually I turn the screen on and it is normal but goes bad within a minute.

          Comment

          • tom66
            EVs Rule
            • Apr 2011
            • 32560
            • UK

            #6
            Re: Plasma LG 50PS60 Screen Problem

            Do you have a digital volt meter available to do tests with?
            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

            • Brutis4555
              Member
              • Jun 2014
              • 20
              • United States

              #7
              Re: Plasma LG 50PS60 Screen Problem

              Yes.

              Comment

              • tom66
                EVs Rule
                • Apr 2011
                • 32560
                • UK

                #8
                Re: Plasma LG 50PS60 Screen Problem

                Do you notice any variation in how long it takes to go pink if the picture content is different?

                For example, on the no signal display - does it last ages - and then on analog snow (not tuned) or normal TV it goes quickly?

                For voltage checks, can you start by testing the Vs and Va voltages from the power supply. You can test directly at the connector. The negative lead of your multimeter can be connected to the chassis, and the positive lead should touch a Vs or Va test point, or on the connectors going to Y-sustain or Z-sustain (sometimes called X-sustain.)
                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

                • Brutis4555
                  Member
                  • Jun 2014
                  • 20
                  • United States

                  #9
                  Re: Plasma LG 50PS60 Screen Problem

                  Can you dumb down what you are saying to check? I am not sure what you mean by those terms and I can't find any of my friends who do either.

                  Comment

                  • tom66
                    EVs Rule
                    • Apr 2011
                    • 32560
                    • UK

                    #10
                    Re: Plasma LG 50PS60 Screen Problem

                    Can you post a picture of your multimeter?
                    I just fixed a 50PS3000 with this fault. Same panel design as yours, minus a few features. It was a bad Vzbias circuit on the Z-sustain.
                    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

                    • Brutis4555
                      Member
                      • Jun 2014
                      • 20
                      • United States

                      #11
                      Re: Plasma LG 50PS60 Screen Problem

                      Here you go. Thank you!
                      Attached Files

                      Comment

                      • tom66
                        EVs Rule
                        • Apr 2011
                        • 32560
                        • UK

                        #12
                        Re: Plasma LG 50PS60 Screen Problem

                        OK, you want to turn your multimeter to the 200 DCV range.
                        Then on the Z-sustain board, on the right hand side you will see a resistor marked VZBIAS

                        For guidance, see page 128 of this document
                        http://www.toms-service-manuals.com/...&Search=Submit
                        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

                        • Brutis4555
                          Member
                          • Jun 2014
                          • 20
                          • United States

                          #13
                          Re: Plasma LG 50PS60 Screen Problem

                          Should I have the TV plugged in and on when testing it? Do I wait to test it until it has been on for 10 minutes?

                          Comment

                          • tom66
                            EVs Rule
                            • Apr 2011
                            • 32560
                            • UK

                            #14
                            Re: Plasma LG 50PS60 Screen Problem

                            Plug it in. You don't have to wait 10 minutes.
                            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

                            • Brutis4555
                              Member
                              • Jun 2014
                              • 20
                              • United States

                              #15
                              Re: Plasma LG 50PS60 Screen Problem

                              Both rear 97.1 on the top and 97.2 on the bottom of them when it is plugged in but not turned on.

                              Comment

                              • tom66
                                EVs Rule
                                • Apr 2011
                                • 32560
                                • UK

                                #16
                                Re: Plasma LG 50PS60 Screen Problem

                                Sorry, meant plug it in and turn it on. See that it remains 97V. Then run it for some time, and when the tint occurs, see if the voltage drops.
                                Also check the Vs on the power supply.
                                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

                                • Brutis4555
                                  Member
                                  • Jun 2014
                                  • 20
                                  • United States

                                  #17
                                  Re: Plasma LG 50PS60 Screen Problem

                                  It went up to 180.

                                  Comment

                                  • Brutis4555
                                    Member
                                    • Jun 2014
                                    • 20
                                    • United States

                                    #18
                                    Re: Plasma LG 50PS60 Screen Problem

                                    The reading on the meter was 181.5 after the screen tint happened.

                                    Comment

                                    • tom66
                                      EVs Rule
                                      • Apr 2011
                                      • 32560
                                      • UK

                                      #19
                                      Re: Plasma LG 50PS60 Screen Problem

                                      Wow, yes, that is definitely bad! Interesting, that the voltage increased on yours, but either way is bad. I had essentially the same problem on my set after replacing two transistors though mine only went to 150V, it made all black level a dark-yellow colour. I never saw a pink tint though..

                                      Replace the transistor FQFP51N25 near the Vzbias point. I think it is Q13, but you should check. You need to replace it soon (and don't run the TV for too long), because if it continues for much longer, it will damage the other two transistors, complicating the repair.
                                      Last edited by tom66; 08-24-2014, 02:27 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

                                      • Brutis4555
                                        Member
                                        • Jun 2014
                                        • 20
                                        • United States

                                        #20
                                        Re: Plasma LG 50PS60 Screen Problem

                                        Ok, i see where it says Q13 but what do I need to change and where can I buy one?
                                        Attached Files

                                        Comment

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