Sony Bravia KDL-40EX403 switch-on/off problem

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  • rogermoss
    New Member
    • Oct 2015
    • 8
    • UK
    #1

    Sony Bravia KDL-40EX403 switch-on/off problem

    I have a Sony Bravia KDL-40EX403 with a switch-on/off problem. It started by rapidly and eratically switching the picture on & off, then the whole TV on & off & on etc.
    In it's current state it is an intermittent fault as follows:-
    From cold & switched off: At switch on sometimes the picture and audio start up normally but only for about 20 seconds. After which either the ‘standby' or ‘on' light come on or both are off. Either way there is no picture or sound. Sometimes the ‘power on' button will bring the ‘standby' light on and then the ‘on' light, but never any picture or sound.
    I have no circuit diagrams so quite lost what to check. All I've managed to do is confirm that the 12 volt power disappears from the connector (CN6403) at the top of the PSU board. The PSU board is identified as APS-254, G2HE, 4-168-556-21 on the label (1-881-411-21 on the board!).
    The Main board (BAL) is 1-881-636-21.

    Help!!
    Tags: None
    • budm
      Badcaps Legend
      • Feb 2010
      • 40746
      • USA
      #2
      Re: Sony Bravia KDL-40EX403 switch-on/off problem

      I would check the DCV of the Standby Voltages and the PS-ON signals to see if they are stable or cycling up and down. Check and reseat the cables and board mounting screws.
      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

        • rogermoss
          New Member
          • Oct 2015
          • 8
          • UK
          #3
          Re: Sony Bravia KDL-40EX403 switch-on/off problem

          Thanks for quick response. I have tried the connector reseats & mounting screws, but no change. TV won't go off at the moment - Sod's law - It's been in the garage all night and it's cold in there. I don't know if that's masking a overheating problem.
          However I'm having difficulty finding relevant voltage monitoring points on the board (only have the board markings to go off and can't see any 5V markings). Can I use the chassis for the return or do I have to find the associated return?

            Comment

            • budm
              Badcaps Legend
              • Feb 2010
              • 40746
              • USA
              #4
              Re: Sony Bravia KDL-40EX403 switch-on/off problem

              When making measurement in the secondary side (cold side) you can use chassis for the meter Black probe.
              How about up loading the good clear pictures of the power supply board, and the closed up pictures of the connectors so we can see the pin labels?
              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

                • rogermoss
                  New Member
                  • Oct 2015
                  • 8
                  • UK
                  #5
                  Re: Sony Bravia KDL-40EX403 switch-on/off problem

                  OK. A few photos, general and connector close ups.

                  (Can't seem to attach more than one file at once, so here's the first one)
                  Attached Files

                    Comment

                    • rogermoss
                      New Member
                      • Oct 2015
                      • 8
                      • UK
                      #6
                      Re: Sony Bravia KDL-40EX403 switch-on/off problem

                      The second.
                      Attached Files

                        Comment

                        • rogermoss
                          New Member
                          • Oct 2015
                          • 8
                          • UK
                          #7
                          Re: Sony Bravia KDL-40EX403 switch-on/off problem

                          The third.
                          Attached Files

                            Comment

                            • rogermoss
                              New Member
                              • Oct 2015
                              • 8
                              • UK
                              #8
                              Re: Sony Bravia KDL-40EX403 switch-on/off problem

                              The fourth.
                              Attached Files

                                Comment

                                • rogermoss
                                  New Member
                                  • Oct 2015
                                  • 8
                                  • UK
                                  #9
                                  Re: Sony Bravia KDL-40EX403 switch-on/off problem

                                  The fifth & last
                                  Attached Files

                                    Comment

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