Panasonic Plasma TX-P50XT50B strange horizontal two lines

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • Damtom
    Senior Member
    • Dec 2014
    • 57
    • UK

    #1

    Panasonic Plasma TX-P50XT50B strange horizontal two lines

    hi all

    I finally managed to fix this Panasonic plasma , in the end A board was shorted and keep burning PSU, after two 2 PSS boards and one A board, i managed to start TV.

    before I connected new A board and PSS Board , I checked also SN board and C1 and C2 boards, i disconnected all ribbons, after visual check I connected back, tv started normal, I had few horizontal black lines but I reseated all ribbons cables and black lines are gone but something else is there - two thick (brighter than rest of screen) horizontal lines on top and on the bottom, please see picture attached.

    anyone knows what's going on, is there setting to be changed in service mode after changing A board ???
    Attached Files
  • tw2005
    Badcaps Legend
    • Oct 2011
    • 6458
    • Australia

    #2
    Re: Panasonic Plasma TX-P50XT50B strange horizontal two lines

    have you run a picture through it yet? looks like after image, i think if you use the Tv normally the picture will be fine or go into serv menu and use aging to generate test patterns like full white or scrolling white bar.

    A board blowing the PSS, that's interesting.

    Comment

    • Damtom
      Senior Member
      • Dec 2014
      • 57
      • UK

      #3
      Re: Panasonic Plasma TX-P50XT50B strange horizontal two lines

      I connected laptop through HDMI and if you look very carefully you can see different colours in this part of screen, but from close distance.

      I went through two PSS boards and I just recalled what tom66 said in other thread that A board can cause problem so I decided to buy A board , but once I connected new A board the old PSS didn't work anymore , bought another one and TV started

      Comment

      • mmartell
        Badcaps Legend
        • Oct 2013
        • 3189
        • Canada

        #4
        Re: Panasonic Plasma TX-P50XT50B strange horizontal two lines

        Yep looks like burn-in likely from improper aspect ratio setting.

        Comment

        • Alastair E
          Chief Womble
          • Mar 2013
          • 1963
          • U.K.

          #5
          Re: Panasonic Plasma TX-P50XT50B strange horizontal two lines

          I had a 50" Panasonic that had image-retention --from a BOSE home-theatre system.

          It faded after several hours use, but I did notice that it was still there when the panel was viewed --Outside, In The Sun! while the set was off....

          You would have thought an alleged 'quality maker' such as BOSE would have not made a system that would effectively destroy a TV set over time, by using a so-called, 'screen-saver'/splash screen that IR or burns the screens!

          --They should have stuck to making speakers with plastic tubes attached, instead of making things that Cause troubles.
          --Many years ago, they were the subject of a Consumer Trade issue as they were selling what was effectively just a cheapo transistor radio and their plastic tube speakers in a box (Folded horn)--for many hundreds of pounds--Cheap plastic crap with huge price-tag, mail-order only!
          TELEFIX

          How PLASMA SCREENS WORK, X-SUS and Y-SUS what they do--
          http://www.irf.com/technical-info/appnotes/an-1088.pdf
          PLEASE DO NOT EMAIL ME PRIVATELY FOR REPAIR ADVICE. QUESTIONS BELONG ON THE FORUM!

          Comment

          • Damtom
            Senior Member
            • Dec 2014
            • 57
            • UK

            #6
            Re: Panasonic Plasma TX-P50XT50B strange horizontal two lines

            @mmartell I tried different aspect ratio .

            @Alastair did you fix in the end ? And what did you change , A board ?

            Comment

            • mmartell
              Badcaps Legend
              • Oct 2013
              • 3189
              • Canada

              #7
              Re: Panasonic Plasma TX-P50XT50B strange horizontal two lines

              Originally posted by Damtom
              @mmartell I tried different aspect ratio .
              That is not what I mean. The previous owner (whom I assume is not you?) looks to have watched program material with black bars at the top and bottom of the screen for an extended period of time causing what you are seeing now. You can only hope it is retention which will go away eventually because burn will not.

              Comment

              • Damtom
                Senior Member
                • Dec 2014
                • 57
                • UK

                #8
                Re: Panasonic Plasma TX-P50XT50B strange horizontal two lines

                @mmartell so screen itself ??


                Another picture attached
                Attached Files

                Comment

                • Damtom
                  Senior Member
                  • Dec 2014
                  • 57
                  • UK

                  #9
                  Re: Panasonic Plasma TX-P50XT50B strange horizontal two lines

                  Mmartell could this happen with over year old TV ??

                  Comment

                  • Alastair E
                    Chief Womble
                    • Mar 2013
                    • 1963
                    • U.K.

                    #10
                    Re: Panasonic Plasma TX-P50XT50B strange horizontal two lines

                    Image-Retention IR can happen with any age or type TV set, Plasma is more prone than LCD, but LCD can still suffer.

                    It depends on how bad the IR is as to whether it will fade with time or is permanent.

                    In the case of my Pan 50" it was fading and getting unnoticable when I sold it. Probably long gone now.

                    Its a shame that its not that well known, leaving stationary images--particularly very bright or computer/games images stationary on the screen for hours on end will make a lasting record of that image on the panel....

                    When the Military scrap their monitors, or TV sets --both types, LCD or Plasma-- they destroy the panels to prevent possible data recovery by the unauthorised....
                    TELEFIX

                    How PLASMA SCREENS WORK, X-SUS and Y-SUS what they do--
                    http://www.irf.com/technical-info/appnotes/an-1088.pdf
                    PLEASE DO NOT EMAIL ME PRIVATELY FOR REPAIR ADVICE. QUESTIONS BELONG ON THE FORUM!

                    Comment

                    • mmartell
                      Badcaps Legend
                      • Oct 2013
                      • 3189
                      • Canada

                      #11
                      Re: Panasonic Plasma TX-P50XT50B strange horizontal two lines

                      Originally posted by Damtom
                      Mmartell could this happen with over year old TV ??
                      Takes a whole lot less time to burn-in an image than that ! So yes, depending on how it was used and for how long it's extremely possible.

                      Remember:

                      Image Retention = Temporary
                      Image Burn-In = Permanent

                      I would try exercising the pixels with "snow" and see if it improves.

                      Comment

                      • mmartell
                        Badcaps Legend
                        • Oct 2013
                        • 3189
                        • Canada

                        #12
                        Re: Panasonic Plasma TX-P50XT50B strange horizontal two lines

                        Originally posted by Alastair E
                        Image-Retention IR can happen with any age or type TV set, Plasma is more prone than LCD, but LCD can still suffer.

                        It depends on how bad the IR is as to whether it will fade with time or is permanent.

                        In the case of my Pan 50" it was fading and getting unnoticable when I sold it. Probably long gone now.

                        Its a shame that its not that well known, leaving stationary images--particularly very bright or computer/games images stationary on the screen for hours on end will make a lasting record of that image on the panel....

                        When the Military scrap their monitors, or TV sets --both types, LCD or Plasma-- they destroy the panels to prevent possible data recovery by the unauthorised....
                        This last part is fascinating. I believe it was tom66 who had mentioned the sane thing not long ago and I had not heard it until then. I would never have thought to glean info from a used panel but I guess spies might !

                        Comment

                        • Damtom
                          Senior Member
                          • Dec 2014
                          • 57
                          • UK

                          #13
                          Re: Panasonic Plasma TX-P50XT50B strange horizontal two lines

                          Hi. Panasonic has anti image retention function in setting, is called ' scrolling bar'. Is this good enough ?

                          I'm using it for last 3 days , can't see any difference to be honest

                          Comment

                          • freakaftr8
                            Badcaps Legend
                            • Oct 2012
                            • 3743
                            • USA

                            #14
                            Re: Panasonic Plasma TX-P50XT50B strange horizontal two lines

                            then it's obvious that your panel has suffered a significant amount of use In letterbox format. or whatever the format is called where the top and bottom bars are not used but the middle of the screen is.

                            what you're seeing is heavily used panel. I had an LG like that once. It was so bad that the middle of the screen that was used Inside of the bars so badly burned that you could see the whites were kind of like a muddy brownish color and there were a lot of sparkles And mal discharge that was not curable but the top and bottom of the screen look perfect
                            Last edited by freakaftr8; 02-11-2015, 02:29 AM.
                            Did I leave the soldering iron on?

                            Comment

                            • Damtom
                              Senior Member
                              • Dec 2014
                              • 57
                              • UK

                              #15
                              Re: Panasonic Plasma TX-P50XT50B strange horizontal two lines

                              If I put white screen on whole screen I can see TV stations logos.

                              This TV hasn't been used for 3 months, so can we honestly say this is not image retention but a burn-in ???

                              Comment

                              • tw2005
                                Badcaps Legend
                                • Oct 2011
                                • 6458
                                • Australia

                                #16
                                Re: Panasonic Plasma TX-P50XT50B strange horizontal two lines

                                Originally posted by Damtom
                                If I put white screen on whole screen I can see TV stations logos.

                                This TV hasn't been used for 3 months, so can we honestly say this is not image retention but a burn-in ???
                                it would be interesting to go into serv mode, then serv tool and bring up hrs on use for the TV. It may have been used commercially on the one channel 24/7?

                                Comment

                                • tom66
                                  EVs Rule
                                  • Apr 2011
                                  • 32560
                                  • UK

                                  #17
                                  Re: Panasonic Plasma TX-P50XT50B strange horizontal two lines

                                  Retention usually only fades when the set is in use, when off it does not fade. I had my Kuro off for over 2 months and it had IR from Windows desktop, the Kuros are pretty good for IR so it faded within a few minutes use.

                                  As for your fault, TBH it looks more like burn in but I'd run it for a few days and see. Sometimes increasing Vsus will hide burn in artefacts.
                                  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

                                  • Damtom
                                    Senior Member
                                    • Dec 2014
                                    • 57
                                    • UK

                                    #18
                                    Re: Panasonic Plasma TX-P50XT50B strange horizontal two lines

                                    This TV was used by my friends. Which option in service menu state used time ??
                                    Attached Files

                                    Comment

                                    • tw2005
                                      Badcaps Legend
                                      • Oct 2011
                                      • 6458
                                      • Australia

                                      #19
                                      Re: Panasonic Plasma TX-P50XT50B strange horizontal two lines

                                      Originally posted by Damtom
                                      This TV was used by my friends. Which option in service menu state used time ??
                                      press 1 to scrool through until srv-tool comes up, hit ok to enter , then use arrows to highlight bottom right box opposite to ptct , then hold mute button on remote until it populates info

                                      Comment

                                      • tw2005
                                        Badcaps Legend
                                        • Oct 2011
                                        • 6458
                                        • Australia

                                        #20
                                        Re: Panasonic Plasma TX-P50XT50B strange horizontal two lines

                                        just realised, you've replaced the A board, so all we'll see is whatever the TV it came out of

                                        Comment

                                        Related Topics

                                        Collapse

                                        • Ihandyrepair
                                          Samsung QN70Q6DTA Ghost or horizontal lines after tape fix horizontal line
                                          by Ihandyrepair
                                          Hi guys

                                          I just started fixing 4k TV few months ago. so I am still learning a lot
                                          I got this tv from friend complaint is ghosting or horizontal lines on image.

                                          never saw the original symptom but I took the tv back home. the funny part is that after bringing to home, the tv worked fine no issue for 3 weeks.
                                          then it started to show the ghosting white image.
                                          I started using the tape method, but this tv does not have a T con board and it has only 1 ribbon cable from main board to the tv panel.
                                          it has 3 thin small boards at the bottom of the...
                                          12-05-2022, 04:18 PM
                                        • busted&disgusted
                                          Panasonic Plasma TC-P50ST30 Horizontal Black Lines
                                          by busted&disgusted
                                          I have a 2011 Panasonic Plasma HD 3D Viera model notorious for the SC board failure. As per a Google for the dreaded 14 blink code I discovered from info on this forum about isolating suspect boards by disconnecting the power cables and using an ohmmeter on the power terminals and this led me to the SC board. I had it repaired by a nearby technician who replaced the shorted transistors and before I got the board back I wondered if any of the buffer boards are damaged and a YouTube showed how to test these by using the ohmmeter and removing the copper colored ribbon cables to the display and use...
                                          10-05-2019, 09:51 AM
                                        • ggil44
                                          Sony XBR-65X750D Horizontal lines bottom of screen
                                          by ggil44
                                          Hi, I have a Sony XBR-65X750D that has horizontal lines at the bottom 6 inches of the screen. These lines appear to be every other line because the picture is still quite visible behind those lines. The lines appear all the time with a few other lines above and below the 6 inch level blinking on and off at about 2 second intervals. I'm not sure if this is a panel issue or power supply/main board problem. I did replace the T-Con board without any change in the problem. Any suggestions you might have would be greatly appreciated. Thanks,
                                          05-30-2023, 07:51 PM
                                        • CyberNinja
                                          Samsung plasma 50" TV, model PN50C540G3F, has black horizontal lines
                                          by CyberNinja
                                          First, the black horizontal lines even overlay the TV's menu. Does this behavior indicate that it's the plasma panel that's defective? If not for the black lines, the TV works just fine. I've cleaned the 6 connectors between the panel and the Y-buffer board, causing no change in the black lines. Visually, the 12 ICs on the Y-buffer look brand new (no holes, etc.). I put my fluke meter in continuity mode and tried to perform the "short" test on the 6 panel ports and found many shorts. But I don't think I'm doing the "short" test correctly and I'm hoping someone can provide guidance....
                                          01-10-2021, 09:38 PM
                                        • jm1234
                                          Panasonic plasma TX-P42ST50 - 6 blinks
                                          by jm1234
                                          Hi,
                                          anyone able to provide the service manual for old plasma Panasonic TX-P42ST50E?
                                          It turns off almost immediately (0~5 seconds after pressing the on/off button) and starts flashing the red diode 6 times.
                                          I disconnected the left-hand side board (SC?, both the ribbon cable and the power cable to it) and also another ribbon going to bottom left board. Then the led signal is 8 flashes. According to service guide to another Panasonic plasma it would mean the left-hand side board is faulty. But I'm not sure it 100% applies to my model.
                                          I checked that board for any obvious faults...
                                          05-22-2024, 06:59 AM
                                        • Loading...
                                        • No more items.
                                        Working...