Wide Black Vertical Line Samsung Plasma NOT Panel

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  • mmartell
    Badcaps Legend
    • Oct 2013
    • 3189
    • Canada

    #1

    Wide Black Vertical Line Samsung Plasma NOT Panel

    Before I repaired the ymain and buffers on this set (hp-t5054) I broke two caps off the e-buffer when removing the mainboard assembly to get to the control board. I just replaced the two caps and the problem remains.

    The line is where I would guess the addressing begins (on the left) but the broken caps were on the center right of the address board when looking at the screen. In other words not in the direct vicinity of the fault.

    Is the affected E-Buffer to blame for this or can the Control Board cause this as that was replaced as well ?

    (Hard to see the affected area because it blends with the black frame but the light is shining on it in the second pic)
    Attached Files
  • tom66
    EVs Rule
    • Apr 2011
    • 32560
    • UK

    #2
    Re: Wide Black Vertical Line Samsung Plasma NOT Panel

    If you broke the caps could you have damaged the PCB?
    Can still be panel .... unlikely though as you mention, would be a bad coincidence. Did you have it working before?
    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

    • tw2005
      Badcaps Legend
      • Oct 2011
      • 6458
      • Australia

      #3
      Re: Wide Black Vertical Line Samsung Plasma NOT Panel

      Be careful with the power lead to those bottom buffers. this is the panel i killed reconnecting that , large arc and destroyed the TV due to residual voltage.

      Pictures of the board? There are buffer ICs on tha board. i have the F buffer in front of me and they're mounted midway. maybe one of those is damaged. The drive signal pass through those.


      HB541(SN74AHCT541) very common, find on main boards, buffer boards, y and maybe x if you wanted to experiment changing one. Not a bad size to work with
      Last edited by tw2005; 10-04-2014, 04:34 AM.

      Comment

      • tw2005
        Badcaps Legend
        • Oct 2011
        • 6458
        • Australia

        #4
        Re: Wide Black Vertical Line Samsung Plasma NOT Panel

        Isn't it the F buffer that drives the left side you say has the black lines?

        Comment

        • mmartell
          Badcaps Legend
          • Oct 2013
          • 3189
          • Canada

          #5
          Re: Wide Black Vertical Line Samsung Plasma NOT Panel

          I want to say it wasn't always like that but can't be sure. Though with the Y buffers in and out of the set I think I would have noticed the bar if it were there.

          Can a control board fail in this fashion ? When I get some time I will have a closer look at the E Buffer.

          Comment

          • mmartell
            Badcaps Legend
            • Oct 2013
            • 3189
            • Canada

            #6
            Re: Wide Black Vertical Line Samsung Plasma NOT Panel

            Exactly my point. I thought each of the address buffers was responsible for a half of the screen and the faults are opposite !

            Comment

            • tw2005
              Badcaps Legend
              • Oct 2011
              • 6458
              • Australia

              #7
              Re: Wide Black Vertical Line Samsung Plasma NOT Panel

              Originally posted by mmartell
              Exactly my point. I thought each of the address buffers was responsible for a half of the screen and the faults are opposite !
              I don't understand

              The black bar is on the left?(I can't make it)

              The F buffer drives the left?

              I don't think the E or those caps would have anything to do with it.

              If the buffer was spiked , could produce a black bar, that is what happened to me but mine was not at the very edge.

              I guess missing signals anywhere along the path could do it. Never traced these I guess an oscilloscope would be needed.

              I'll take the back seat on this one
              Last edited by tw2005; 10-04-2014, 05:05 AM.

              Comment

              • mmartell
                Badcaps Legend
                • Oct 2013
                • 3189
                • Canada

                #8
                Re: Wide Black Vertical Line Samsung Plasma NOT Panel

                Right. My assumption is that the address buffers work similar to the Y buffers in that a fault would be localized to the area served by the buffer which is not the case here. Perhaps the address buffers don't work that way.

                I don't remember disconnecting the connector to the F buffer as I had no reason to do so.

                Comment

                • tom66
                  EVs Rule
                  • Apr 2011
                  • 32560
                  • UK

                  #9
                  Re: Wide Black Vertical Line Samsung Plasma NOT Panel

                  It is possible for the control board to cause this fault on some earlier panels. Not sure about this one. On newer panels it's very unlikely. Picture of the control board?
                  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

                  • mmartell
                    Badcaps Legend
                    • Oct 2013
                    • 3189
                    • Canada

                    #10
                    Re: Wide Black Vertical Line Samsung Plasma NOT Panel

                    Right here, tom.

                    http://www.shopjimmy.com/media/catal...bn9606522a.jpg

                    Comment

                    • tom66
                      EVs Rule
                      • Apr 2011
                      • 32560
                      • UK

                      #11
                      Re: Wide Black Vertical Line Samsung Plasma NOT Panel

                      That's a newer generation (no logic buffer ICs) so I'd say that wouldn't cause the fault.
                      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

                      • mmartell
                        Badcaps Legend
                        • Oct 2013
                        • 3189
                        • Canada

                        #12
                        Re: Wide Black Vertical Line Samsung Plasma NOT Panel

                        Ok so E or F buffer. Is each buffer responsible for one half of the screen or do they not work like that ?

                        Comment

                        • tom66
                          EVs Rule
                          • Apr 2011
                          • 32560
                          • UK

                          #13
                          Re: Wide Black Vertical Line Samsung Plasma NOT Panel

                          Yes they are responsible for each half but they really are only data buffers. They do not process the video in any way. Just provide power (Va ~60VDC, Vcc ~5VDC/~3.3VDC), clock, data and reset signals..
                          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

                          • mmartell
                            Badcaps Legend
                            • Oct 2013
                            • 3189
                            • Canada

                            #14
                            Re: Wide Black Vertical Line Samsung Plasma NOT Panel

                            But I clobbered the caps on the E buffer and the picture fault is on the opposite side so to boil it down I have a problem with my F Buffer or I may in fact have a bad panel.

                            Comment

                            • tom66
                              EVs Rule
                              • Apr 2011
                              • 32560
                              • UK

                              #15
                              Re: Wide Black Vertical Line Samsung Plasma NOT Panel

                              I think F-buffer or panel at fault here. Probably unrelated damage.
                              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

                              • mmartell
                                Badcaps Legend
                                • Oct 2013
                                • 3189
                                • Canada

                                #16
                                Re: Wide Black Vertical Line Samsung Plasma NOT Panel

                                I went to remove the F-Buffer but found the panel ribbons bonded to the buffers instead of terminating into connectors. Buggers!

                                I called the thread "...NOT Panel" that may have been premature. How can I probe or scope that ribbon on the address board to see if the signals are indeed there ?
                                Attached Files

                                Comment

                                • tom66
                                  EVs Rule
                                  • Apr 2011
                                  • 32560
                                  • UK

                                  #17
                                  Re: Wide Black Vertical Line Samsung Plasma NOT Panel

                                  Huh? Those look like they terminate into connectors...? What am I missing?
                                  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

                                  • tw2005
                                    Badcaps Legend
                                    • Oct 2011
                                    • 6458
                                    • Australia

                                    #18
                                    Re: Wide Black Vertical Line Samsung Plasma NOT Panel

                                    Originally posted by mmartell
                                    I went to remove the F-Buffer but found the panel ribbons bonded to the buffers instead of terminating into connectors. Buggers!

                                    I called the thread "...NOT Panel" that may have been premature. How can I probe or scope that ribbon on the address board to see if the signals are indeed there ?
                                    No , that's not right, std lever action connector and ribbon

                                    Comment

                                    • tw2005
                                      Badcaps Legend
                                      • Oct 2011
                                      • 6458
                                      • Australia

                                      #19
                                      Re: Wide Black Vertical Line Samsung Plasma NOT Panel

                                      whatever you do, don't run the tv without the metal strip heatsink across those ribbons.

                                      Comment

                                      • mmartell
                                        Badcaps Legend
                                        • Oct 2013
                                        • 3189
                                        • Canada

                                        #20
                                        Re: Wide Black Vertical Line Samsung Plasma NOT Panel

                                        Sorry I should have clarified... that is a Shopjimmy pic of the buffer I thought I had until I disassembled my tv to find NO connectors. That board was just for illustration as I think everything else is the same.

                                        Comment

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