2Sec to black repeat issues

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  • artoodeestu
    Member
    • May 2014
    • 13
    • Australia

    #1

    2Sec to black repeat issues

    Hi guys,

    Just to preface this, I've read and followed the sticky guide on this.

    I've got a samsung Syncmaster 2443BW, and it had the 2 sec to black issue. I replaced most of the caps, and it worked fr about 2 and a half hours before reverting back to 2 sec to black.
    Anyone know why this happens, and if there is a fix for it?
    The fact it was working then stopped again leads me to believe it wasn't the caps.
    I can take other photos if need be.
    Cheers
    Attached Files
  • Rtech
    Badcaps Legend
    • Jul 2010
    • 1095

    #2
    Re: 2Sec to black repeat issues

    the three most likely areas are the Inverter transformer,one or more of the 6 large Black diodes,and more probably the failure of one or more of the Backlights/Backlight wiring.

    Comment

    • artoodeestu
      Member
      • May 2014
      • 13
      • Australia

      #3
      Re: 2Sec to black repeat issues

      Ah, rightio.
      How would I go about checking them?
      Thanks

      Comment

      • Rtech
        Badcaps Legend
        • Jul 2010
        • 1095

        #4
        Re: 2Sec to black repeat issues

        Sorry,but I'm away for a week now, but I'm sure you will get some help.Good luck.

        Comment

        • stj
          Great Sage 齊天大聖
          • Dec 2009
          • 30953
          • Albion

          #5
          Re: 2Sec to black repeat issues

          start by resoldering the invertor transformers.

          Comment

          • artoodeestu
            Member
            • May 2014
            • 13
            • Australia

            #6
            Re: 2Sec to black repeat issues

            Which ones are those? I'm pretty new to all this stuff, but thanks for the help

            Comment

            • budm
              Badcaps Legend
              • Feb 2010
              • 40746
              • USA

              #7
              Re: 2Sec to black repeat issues

              The one with TM-09176 printed on top. So you did not replace all the caps, especially the ones for the inverter circuits two close to the inverter transformer. You should at least check the capacitance and the ESR to eliminate the possibility, it is always better to replace the cap as set.
              You can also have bad connection on the lamps ends inside the LCD panel.
              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

              • artoodeestu
                Member
                • May 2014
                • 13
                • Australia

                #8
                Re: 2Sec to black repeat issues

                I replaced the two just above the TM-09176, to check the capacitance and ESR can I use a multimeter?

                Comment

                • budm
                  Badcaps Legend
                  • Feb 2010
                  • 40746
                  • USA

                  #9
                  Re: 2Sec to black repeat issues

                  You need ESR meter to check ESR, Capacitance meter to check capacitance, or you can buy meter that can do both.
                  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

                  • budm
                    Badcaps Legend
                    • Feb 2010
                    • 40746
                    • USA

                    #10
                    Re: 2Sec to black repeat issues

                    You can build two of these for testing inverter function.
                    https://www.badcaps.net/forum/showthread.php?t=19987
                    BTW, we need the pictures of the bottom side of the board so we can show you where to test the inverter transformer winding resistances.
                    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

                    • 0imel
                      New Member
                      • Oct 2014
                      • 1
                      • Germany

                      #11
                      Re: 2Sec to black repeat issues

                      Can anyone of you tell me the correct resistance values for the TM-09176 Inverter?

                      My samsung Syncmaster 2443BW also switches off after 2sec. Shining light on it you can still see the image on the screen.
                      The Elkos look good and I measured the resistance of the TM-09176. The two secondary coils both got 1100 Ohm and the primary got only 0.2 Ohm which seems too little for me.

                      Thanks.

                      Comment

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