Zenith Z50PJ240 Pixel StormHelp

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  • iaff284
    Member
    • May 2014
    • 29
    • USA

    #1

    Zenith Z50PJ240 Pixel StormHelp

    Hello all! I have a Zenith Z50PJ240 with an LG 50T1 main, Ysus, and Zsus boards. The TV powers on and functions normally but it has a pixel storm with pinkish pixels, pixel blackout in certain areas on occasion, and occasional image ghosting I have downloaded the repair manual and checked the voltages for VS, VY, VSC, and VZB. Everything is within spec. Anybody have any ideas on where to check next? Thanks in advance!
  • dick_barton
    Badcaps Legend
    • Aug 2015
    • 6642
    • Wales

    #2
    Re: Zenith Z50PJ240 Pixel StormHelp

    Check for poor or cracked solder joints around the coils on the boards and make good.
    Willing to help but I'm no expert.

    Comment

    • iaff284
      Member
      • May 2014
      • 29
      • USA

      #3
      Re: Zenith Z50PJ240 Pixel StormHelp

      Thanks for the help Dick, can you give me an idea of which parts are the coils?

      Comment

      • dick_barton
        Badcaps Legend
        • Aug 2015
        • 6642
        • Wales

        #4
        Re: Zenith Z50PJ240 Pixel StormHelp

        This is where photo's, clear and in focus of your boards come in handy.
        Willing to help but I'm no expert.

        Comment

        • iaff284
          Member
          • May 2014
          • 29
          • USA

          #5
          Re: Zenith Z50PJ240 Pixel StormHelp

          Sorry, here are the pics
          Attached Files

          Comment

          • dick_barton
            Badcaps Legend
            • Aug 2015
            • 6642
            • Wales

            #6
            Re: Zenith Z50PJ240 Pixel StormHelp

            The two coils I can see are marked but you meed to check all the solder joint around the boards and make sure they look good.
            Attached Files
            Willing to help but I'm no expert.

            Comment

            • Nick's Tvs
              Badcaps Veteran
              • Jan 2014
              • 621
              • USA

              #7
              Re: Zenith Z50PJ240 Pixel StormHelp

              This is what a typical cracked solder joint would look like on those coils

              http://www.nickstvs.com/uploads/5/0/..._i8_w2560.jpeg

              As dick Barton stated, there is a chance that you could have an issue with the cracked solder joints, but if you are unable to find any, it is possible you could have one transistor that is not fully but only partially shorted and causing the pixelation and ghosting you are describing. We have seen the pixelation come from the Y-sustain in the past, but the ghosting you have described does make it seem like a Z-sus issue.

              Comment

              • iaff284
                Member
                • May 2014
                • 29
                • USA

                #8
                Re: Zenith Z50PJ240 Pixel StormHelp

                Ok guys, I checked the coil joints and one joint on each of them may have had a crack so I resoldered those joints. Nick, how do I test the transistors?

                Comment

                • dick_barton
                  Badcaps Legend
                  • Aug 2015
                  • 6642
                  • Wales

                  #9
                  Re: Zenith Z50PJ240 Pixel StormHelp

                  If you still have the same pink problem after making good the solder joints then search Youtube for video's on testing mosefts, transistors and diodes. Easier than trying to explain.
                  Willing to help but I'm no expert.

                  Comment

                  • iaff284
                    Member
                    • May 2014
                    • 29
                    • USA

                    #10
                    Re: Zenith Z50PJ240 Pixel StormHelp

                    OK, will do!

                    Comment

                    • iaff284
                      Member
                      • May 2014
                      • 29
                      • USA

                      #11
                      Re: Zenith Z50PJ240 Pixel StormHelp

                      Well, just put everything back together and no change....looks like its off to a self study program on zener diodes and transisters......

                      Comment

                      • iaff284
                        Member
                        • May 2014
                        • 29
                        • USA

                        #12
                        Re: Zenith Z50PJ240 Pixel StormHelp

                        Ok, I checked the transistors on the Ysus and Zsus with + to Drain and - to Source and none of them are shorted. Anybody have any other ideas?

                        Comment

                        • Andrew F. Ali
                          Badcaps Legend
                          • Jan 2014
                          • 2450
                          • Trinidad & Tobago

                          #13
                          Re: Zenith Z50PJ240 Pixel StormHelp

                          This appears to be a Z-sus Bd issue. Replace the Z-sus Bd and you issue will go away.

                          Comment

                          • iaff284
                            Member
                            • May 2014
                            • 29
                            • USA

                            #14
                            Re: Zenith Z50PJ240 Pixel StormHelp

                            The Z-sus board has been replaced and the issue is gone!! You guys rock! Thank you all for your help!!!

                            Comment

                            • iaff284
                              Member
                              • May 2014
                              • 29
                              • USA

                              #15
                              Re: Zenith Z50PJ240 Pixel StormHelp

                              Correction, the image ghosting and pixel blackout is gone however the pixel storm is still present. I verified the VY, VSC, and VSB voltages and all are exactly where they should be. There is a green light on the control board that is blinking in a set pattern. Any idea if it would indicate a fault. Anybody have any other ideas on where to check for the pixel storm problem?

                              Comment

                              • iaff284
                                Member
                                • May 2014
                                • 29
                                • USA

                                #16
                                Re: Zenith Z50PJ240 Pixel StormHelp

                                So the pixel storm is still present but has moved from the center of the screen with ghosting to the edges of the screen with no ghosting. I am thinking about replacing the Ysus board but dont want to just throw parts at it. Anyone have any advice?

                                Comment

                                • iaff284
                                  Member
                                  • May 2014
                                  • 29
                                  • USA

                                  #17
                                  Re: Zenith Z50PJ240 Pixel StormHelp

                                  Anybody??????

                                  Comment

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