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    Another Samsung Another Audio-But-No-Display Issue

    I am beginning to think I have a SamSung curse.. Every time I touch one, it won't fix...

    Samsung LN46C600....

    At first I thought it was a plasma because it's A)Heavy and 2) Has metal back...

    But, nope.. It's an LED/LCD...

    I get sound, but no display... Read thru available LN46C600 threads...

    https://www.badcaps.net/forum/search...archid=4308173

    Strong flashlight shows display is present, so it's a backlight issue...

    One post from BudM stood out...

    BN44-00341B from TOM66. This board has pull-up resistors, so if you unplug the cable between power supply and the main board, the backlights should come on when you plug TV into the AC outlet.

    On this set, I unplug the main board from the power board and plug in.. Don't get any kind of light, flicker or anything....

    Before I tear into the unit down to the bare backlights, I was hoping there was something else I can check first...

    In reading thru the afore mentioned threads, I read about the guy who invoked the wrath of Zues when checking the large caps...

    Want to avoid that if at all possible..

    T minus 5 days until my Rigol DS1074Z arrives
    Attached Files

    #2
    Re: Another Samsung Another Audio-But-No-Display Issue

    Originally posted by Michale32086 View Post
    In reading thru the afore mentioned threads, I read about the guy who invoked the wrath of Zues when checking the large caps...

    Want to avoid that if at all possible..

    T minus 5 days until my Rigol DS1074Z arrives

    For this I have something special. I took an clip lead, cut it in half and soldered it to a 5W 100 Ohm ceramic wire wound resistor. Put that on the caps, wait a few seconds and there shall be no more
    Then I proceed with my LCR meter.

    Comment


      #3
      Re: Another Samsung Another Audio-But-No-Display Issue

      OK, without cable between the main board and the power supply board, check to see if you do have standby A5V, if you do then check and see if you do have >360VDC (you need to have this Voltage) on the main filter cap (check the DCV right at the two legs of the cap), if you do, then check the fuse FS802S.
      Attached Files
      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


        #4
        Re: Another Samsung Another Audio-But-No-Display Issue

        Originally posted by budm View Post
        OK, without cable between the main board and the power supply board, check to see if you do have standby A5V, if you do then check and see if you do have >360VDC (you need to have this Voltage) on the main filter cap (check the DCV right at the two legs of the cap), if you do, then check the fuse FS802S.
        FS802S checks out...

        I do get 5v on the standby A5V when the cable between the main board and the power board is disconnected..

        I am working up the courage to check the big 450V capacitor..

        Comment


          #5
          Re: Another Samsung Another Audio-But-No-Display Issue

          just do not touch anything with your hands or body, and do not let the probes slip out on you.
          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


            #6
            Re: Another Samsung Another Audio-But-No-Display Issue

            Originally posted by budm View Post
            just do not touch anything with your hands or body, and do not let the probes slip out on you.
            That's my plan..

            OK... With my son's help... After he finished laughing his arse at my skittish-ness....

            393V +/-
            Attached Files
            Last edited by Michale32086; 01-05-2015, 12:27 PM.

            Comment


              #7
              Re: Another Samsung Another Audio-But-No-Display Issue

              get some alligator clips for those probes, problem solved!

              Comment


                #8
                Re: Another Samsung Another Audio-But-No-Display Issue

                Yea, already ordered..

                Nice Pomona clips with good insulation.. Checking voltages always scares me the crap...

                Going into town tomorrow and picking up some generic ones to tide me over..

                Comment


                  #9
                  Re: Another Samsung Another Audio-But-No-Display Issue

                  Originally posted by Michale32086 View Post
                  That's my plan..

                  OK... With my son's help... After he finished laughing his arse at my skittish-ness....

                  393V +/-
                  OK, PFC is working, now I need to look at the inverter circuit section next.
                  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


                    #10
                    Re: Another Samsung Another Audio-But-No-Display Issue

                    Originally posted by budm View Post
                    OK, PFC is working, now I need to look at the inverter circuit section next.
                    OK,which section is that?? Looking at the schematic, I can't find that labeled..

                    Comment


                      #11
                      Re: Another Samsung Another Audio-But-No-Display Issue

                      OK, check CI818 capacitance, it is 0.47uF 450V Poly cap.
                      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


                        #12
                        Re: Another Samsung Another Audio-But-No-Display Issue

                        Originally posted by budm View Post
                        OK, check CI818 capacitance, it is 0.47uF 450V Poly cap.
                        I assume that the arrow points to the Negative??

                        The access to the pads is somewhat limited... Is there any special trick to checking it??
                        Attached Files

                        Comment


                          #13
                          Re: Another Samsung Another Audio-But-No-Display Issue

                          It is non-polarized cap. You will have to remove it to check the capacitance.
                          BTW, you never did see the backlights even flash on for second?
                          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


                            #14
                            Re: Another Samsung Another Audio-But-No-Display Issue

                            Originally posted by budm View Post
                            It is non-polarized cap. You will have to remove it to check the capacitance.
                            OK, just to clarify.. I need to remove that cap and then check the capacitance on the empty pads??


                            Originally posted by budm View Post
                            BTW, you never did see the backlights even flash on for second?
                            I confirmed.. I darkened the room and plugged it in.. No light whatsoever...

                            Comment


                              #15
                              Re: Another Samsung Another Audio-But-No-Display Issue

                              "OK, just to clarify.. I need to remove that cap and then check the capacitance on the empty pads??"
                              Check the capacitance of the cap you removed.
                              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


                                #16
                                Re: Another Samsung Another Audio-But-No-Display Issue

                                OK That's where I think I am going to be tripped up.. I don't have a meter that checks capacitance....
                                Attached Files

                                Comment


                                  #17
                                  Re: Another Samsung Another Audio-But-No-Display Issue

                                  On the other hand, I pulled the cap off and there is a slight pimple/bulge on either side of the cap...
                                  Attached Files

                                  Comment


                                    #18
                                    Re: Another Samsung Another Audio-But-No-Display Issue

                                    It looks bad. Check the capacitance.
                                    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


                                      #19
                                      Re: Another Samsung Another Audio-But-No-Display Issue

                                      Originally posted by Michale32086 View Post
                                      OK That's where I think I am going to be tripped up.. I don't have a meter that checks capacitance....
                                      May be its time to get Cap meter that can do capacitance and ESR testing if you are going to do more repair works.
                                      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


                                        #20
                                        Re: Another Samsung Another Audio-But-No-Display Issue

                                        I'd be replacing it anyway...

                                        Comment

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