Sony KDL-40S2000 Chassis 40WAX2

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  • budm
    Badcaps Legend
    • Feb 2010
    • 40746
    • USA

    #21
    Re: Sony KDL-40S2000 Chassis 40WAX2

    Ah, so close!
    Never stop learning
    Basic LCD TV and Monitor troubleshooting guides.
    http://www.badcaps.net/forum/showthr...956#post305956

    Voltage Regulator (LDO) testing:
    http://www.badcaps.net/forum/showthr...999#post300999

    Inverter testing using old CFL:
    http://www.badcaps.net/forum/showthr...er+testing+cfl

    Tear down pictures : Hit the ">" Show Albums and stories" on the left side
    http://s807.photobucket.com/user/budm/library/

    TV Factory reset codes listing:
    http://www.badcaps.net/forum/showthread.php?t=24809

    Comment

    • kevinm34232
      Badcaps Legend
      • May 2012
      • 1884
      • USA

      #22
      Re: Sony KDL-40S2000 Chassis 40WAX2

      So I picked up same model with broken screen today out of curiosity, and tested voltages

      Here are voltage readings at CN7009

      (original tv that shuts down)

      Off - On
      Pin 1 - 0 - 1.6v
      Pin 2 - 0 - 3.2v (when backlight breifly comes on)
      Pin 3 - 0 - 1.7v
      Pin 4 - 0 - 3.3v
      Pin 5 - 2.3v - 0
      Pin 6 - 0 - 3.3v
      Pin 7 - GRD

      (New TV that does not shut down)

      Off - On
      Pin 1 - 0 - 2.3v
      Pin 2 - 0 - 3.1v
      Pin 3 - 0 - 1.6v
      Pin 4 - 0 - 3.3v
      Pin 5 - 2.3v - 0
      Pin 6 - 0 - 3.3v
      Pin 7 - GRD

      So the difference I see Bud is pin 1 (DIMMER). What do you think and what can I try while I have both these sets sitting here open?

      Should I switch inverter boards and see what voltages I get?
      Last edited by kevinm34232; 07-10-2012, 08:42 PM. Reason: Thought

      Comment

      • kevinm34232
        Badcaps Legend
        • May 2012
        • 1884
        • USA

        #23
        Re: Sony KDL-40S2000 Chassis 40WAX2

        Switched inverter boards now Im confused, Tv shut off but pin 1 voltage was now the same 2.3v. Switch back and Tv stays on. Seems inverter board is bad but I feel Im missing something.

        Comment

        • budm
          Badcaps Legend
          • Feb 2010
          • 40746
          • USA

          #24
          Re: Sony KDL-40S2000 Chassis 40WAX2

          The Dimming control pin i just for dimming the backlights, some set will use 0v for lowest light output, 5V will be for maximum light output, so it is variable between 0 and 5V, some other brand may have it opposite.
          The input signal for controlling the inverter will usually be, BL_ON (BACKLIGHT ON, or ON), Dimming (analog dimming will use variable voltage 0~5V, or PWM dimming control, which will be fix frequency with variable pulse width), so your dimming signal is OK.
          So the TV with broken screen uses the same two inverter boards setup? and you install the inverter board from the TV that we were troubleshooting into another TV and it caused the other TV to shutdown?
          Never stop learning
          Basic LCD TV and Monitor troubleshooting guides.
          http://www.badcaps.net/forum/showthr...956#post305956

          Voltage Regulator (LDO) testing:
          http://www.badcaps.net/forum/showthr...999#post300999

          Inverter testing using old CFL:
          http://www.badcaps.net/forum/showthr...er+testing+cfl

          Tear down pictures : Hit the ">" Show Albums and stories" on the left side
          http://s807.photobucket.com/user/budm/library/

          TV Factory reset codes listing:
          http://www.badcaps.net/forum/showthread.php?t=24809

          Comment

          • kevinm34232
            Badcaps Legend
            • May 2012
            • 1884
            • USA

            #25
            Re: Sony KDL-40S2000 Chassis 40WAX2

            Yes that's correct, I will do it again tomorrow and check all pin voltages, shouldn't there be one feedback pin that should trigger it?

            Comment

            • budm
              Badcaps Legend
              • Feb 2010
              • 40746
              • USA

              #26
              Re: Sony KDL-40S2000 Chassis 40WAX2

              That panel_det pin3 of CN7009 should should be high >3VDC if the inverter is OK. 0V should mean the inverter circuit is bad, that was we were going to check before the board was damaged.
              Never stop learning
              Basic LCD TV and Monitor troubleshooting guides.
              http://www.badcaps.net/forum/showthr...956#post305956

              Voltage Regulator (LDO) testing:
              http://www.badcaps.net/forum/showthr...999#post300999

              Inverter testing using old CFL:
              http://www.badcaps.net/forum/showthr...er+testing+cfl

              Tear down pictures : Hit the ">" Show Albums and stories" on the left side
              http://s807.photobucket.com/user/budm/library/

              TV Factory reset codes listing:
              http://www.badcaps.net/forum/showthread.php?t=24809

              Comment

              • kevinm34232
                Badcaps Legend
                • May 2012
                • 1884
                • USA

                #27
                Re: Sony KDL-40S2000 Chassis 40WAX2

                Well swapped inverter boards a couple of times, basically it seems the inverter board is bad, the one we were working on always shuts down the TV, the new one always stays on. The voltages are all the same but drop off when TV shuts down so no indication of what's actually wrong.

                Comment

                • budm
                  Badcaps Legend
                  • Feb 2010
                  • 40746
                  • USA

                  #28
                  Re: Sony KDL-40S2000 Chassis 40WAX2

                  Now we have to troubleshoot it down to component level, not sure how deep you will want get into it.
                  You can start by check the transformer resistance reading compared it to the working one.
                  The good thing is that you have good board as a reference.
                  Never stop learning
                  Basic LCD TV and Monitor troubleshooting guides.
                  http://www.badcaps.net/forum/showthr...956#post305956

                  Voltage Regulator (LDO) testing:
                  http://www.badcaps.net/forum/showthr...999#post300999

                  Inverter testing using old CFL:
                  http://www.badcaps.net/forum/showthr...er+testing+cfl

                  Tear down pictures : Hit the ">" Show Albums and stories" on the left side
                  http://s807.photobucket.com/user/budm/library/

                  TV Factory reset codes listing:
                  http://www.badcaps.net/forum/showthread.php?t=24809

                  Comment

                  • kevinm34232
                    Badcaps Legend
                    • May 2012
                    • 1884
                    • USA

                    #29
                    Re: Sony KDL-40S2000 Chassis 40WAX2

                    OK, how do I know which pins to check?
                    Attached Files

                    Comment

                    • mcrivers
                      New Member
                      • Jul 2014
                      • 5
                      • usa

                      #30
                      Re: Sony KDL-40S2000 Chassis 40WAX2

                      hello

                      Comment

                      • mcrivers
                        New Member
                        • Jul 2014
                        • 5
                        • usa

                        #31
                        Re: Sony KDL-40S2000 Chassis 40WAX2

                        same problem plz help

                        Comment

                        • mcrivers
                          New Member
                          • Jul 2014
                          • 5
                          • usa

                          #32
                          Re: Sony KDL-40S2000 Chassis 40WAX2

                          Comment

                          • mcrivers
                            New Member
                            • Jul 2014
                            • 5
                            • usa

                            #33
                            Re: Sony KDL-40S2000 Chassis 40WAX2

                            what pins

                            Comment

                            • mcrivers
                              New Member
                              • Jul 2014
                              • 5
                              • usa

                              #34
                              Re: Sony KDL-40S2000 Chassis 40WAX2

                              Comment

                              • budm
                                Badcaps Legend
                                • Feb 2010
                                • 40746
                                • USA

                                #35
                                Re: Sony KDL-40S2000 Chassis 40WAX2

                                Please provide good clear pictures of the bottom side of the board, the OP did not provide the pictures of the bottom side, only the top side.
                                Are you having the same problem and narrow it down to the inverter board?
                                Never stop learning
                                Basic LCD TV and Monitor troubleshooting guides.
                                http://www.badcaps.net/forum/showthr...956#post305956

                                Voltage Regulator (LDO) testing:
                                http://www.badcaps.net/forum/showthr...999#post300999

                                Inverter testing using old CFL:
                                http://www.badcaps.net/forum/showthr...er+testing+cfl

                                Tear down pictures : Hit the ">" Show Albums and stories" on the left side
                                http://s807.photobucket.com/user/budm/library/

                                TV Factory reset codes listing:
                                http://www.badcaps.net/forum/showthread.php?t=24809

                                Comment

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