Sony Bravia 40" LCD Model KDL40s4100

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  • jimb0b
    Member
    • Oct 2012
    • 17
    • Canada

    #1

    Sony Bravia 40" LCD Model KDL40s4100

    Picked up a non-working Sony Bravia 40" LCD Model KDL40S4100 today FOC. Cleaned it up, checked for physical damage, and then powered it up: power light came on, snow on screen for a couple of seconds followed by blank screen and standby light flashing twice. I haven't opened it up yet but wondering if anyone has any ideas on the best way to short circuit (!!!) the fault finding process. Thanks in advance. This is my first LCD TV although I have done a few computer monitors in the past. And this is my first post here so take pity on me
  • budm
    Badcaps Legend
    • Feb 2010
    • 40746
    • USA

    #2
    Re: Sony Bravia 40" LCD Model KDL40s4100

    Service manual:

    The bad part for this model: from page 11 of the service manual

    IMPORTANT:
    The units in this manual DO NOT contain a self-diagnostic function. If an error occurs, the TV will not stay on. It is our
    is required for this set, the technician should bring both the A Board and the G Board to the customer location.
    Last edited by budm; 10-17-2012, 12:15 AM.
    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

    • jimb0b
      Member
      • Oct 2012
      • 17
      • Canada

      #3
      Re: Sony Bravia 40" LCD Model KDL40s4100

      Originally posted by budm
      .....
      The bad part for this model: from page 11 of the service manual

      IMPORTANT:
      The units in this manual DO NOT contain a self-diagnostic function. If an error occurs, the TV will not stay on. It is our
      is required for this set, the technician should bring both the A Board and the G Board to the customer location.
      Yes, I saw that unfortunately. When I first searched, I came across references to the self-diagnostic function of similar models (Sony, 40", LCD with CCFL) which suggested that two flashes of the Standby LED was a inverter board problem. So I thought, great - that will be an easy replacement!

      Oh well, I guess I'll know more when I open her up I've never worked on anything that needs this much bench space before.

      Comment

      • tom66
        EVs Rule
        • Apr 2011
        • 32560
        • UK

        #4
        Re: Sony Bravia 40" LCD Model KDL40s4100

        I believe me/Sienoki have this same model with bust screen, but all parts working.
        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

        • jimb0b
          Member
          • Oct 2012
          • 17
          • Canada

          #5
          Re: Sony Bravia 40" LCD Model KDL40s4100

          Are you referring to Sienoki who posts on this site?
          Last edited by jimb0b; 10-17-2012, 10:25 AM.

          Comment

          • tom66
            EVs Rule
            • Apr 2011
            • 32560
            • UK

            #6
            Re: Sony Bravia 40" LCD Model KDL40s4100

            Yes. I can't remember if it's "S" or "W" we've got, but the boards may be good for either.
            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

            • jimb0b
              Member
              • Oct 2012
              • 17
              • Canada

              #7
              Re: Sony Bravia 40" LCD Model KDL40s4100

              So finally got some time to take the back off and start looking around. No obvious capacitor issues or burned out components or previous repair attempts. I'm going to do some voltage and continuity checks shortly and check the inverter board. In the meanwhile, here are a few "interior" shots.
              Attached Files

              Comment

              • Village Electronics
                OldPro
                • Apr 2011
                • 118

                #8
                Re: Sony Bravia 40" LCD Model KDL40s4100

                Originally posted by jimb0b
                Picked up a non-working Sony Bravia 40" LCD Model KDL40S4100 today FOC. Cleaned it up, checked for physical damage, and then powered it up: power light came on, snow on screen for a couple of seconds followed by blank screen and standby light flashing twice. I haven't opened it up yet but wondering if anyone has any ideas on the best way to short circuit (!!!) the fault finding process. Thanks in advance. This is my first LCD TV although I have done a few computer monitors in the past. And this is my first post here so take pity on me
                My guess is that you have a bad ccfl. That is inside the LCD panel itself. They can be changed but it is not easy.

                Comment

                • budm
                  Badcaps Legend
                  • Feb 2010
                  • 40746
                  • USA

                  #9
                  Re: Sony Bravia 40" LCD Model KDL40s4100

                  I would remove the balancer board and look real close at the sockets where the board is attached to the lamps, see if the black sockets have any sign of over heat or blister, look and clean the fingers of the board also, insert the board back in and see if the lamp will stay on.
                  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

                  • jimb0b
                    Member
                    • Oct 2012
                    • 17
                    • Canada

                    #10
                    Re: Sony Bravia 40" LCD Model KDL40s4100

                    I checked the voltages on the test points behind the transformers and they ranged from 0.1V to 0.4V except one which was 9.1V (see picture). So I figure I have the problem. The next question: is it the transformer or the ccfl? Any ideas on how to figure that out?
                    Attached Files
                    Last edited by jimb0b; 10-24-2012, 08:23 PM.

                    Comment

                    • jimb0b
                      Member
                      • Oct 2012
                      • 17
                      • Canada

                      #11
                      Re: Sony Bravia 40" LCD Model KDL40s4100

                      Success! I removed the transformer which showed the abnormal voltage, soldered in a jumper and up she came! Using OTA signal, it picked up 12 high def stations immediately. Now all I need to do is find a remote for it.

                      BTW, the efffect of removing that ccfl is practically nil. With any picture on the screen, you absolutely cannot see the difference. When there is a blank screen, it can be noticed from acute angles and then only if it is mentioned.

                      Here are pics of the final result (Craig Ferguson interviewing Susan Sarandon tonight) and a picture of the repair.

                      Tks everyone for your help and advice.
                      Attached Files

                      Comment

                      • budm
                        Badcaps Legend
                        • Feb 2010
                        • 40746
                        • USA

                        #12
                        Re: Sony Bravia 40" LCD Model KDL40s4100

                        Great job locating the cause of the problem. By the way, what resistance reading on the transformer you removed compared to the other transformer? It looks like the transformers are hooked up in series with each other.
                        Other person on the forum had the bad connection problem with the PCB sockets so you may also want to keep an eye on that. I will take some resistance reading of spare SONY balancer board's transformers.
                        Last edited by budm; 10-25-2012, 09:17 AM.
                        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

                        • tom66
                          EVs Rule
                          • Apr 2011
                          • 32560
                          • UK

                          #13
                          Re: Sony Bravia 40" LCD Model KDL40s4100

                          Norcal715 with similar problem on a Samsung: http://www.youtube.com/watch?v=oE6K4xBVweA&feature=plcp

                          I think he diagnosed it as a failed CCFL, not transformer.
                          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

                          • jimb0b
                            Member
                            • Oct 2012
                            • 17
                            • Canada

                            #14
                            Re: Sony Bravia 40" LCD Model KDL40s4100

                            Originally posted by budm
                            Great job locating the cause of the problem. By the way, what resistance reading on the transformer you removed compared to the other transformer? It looks like the transformers are hooked up in series with each other.
                            Other person on the forum had the bad connection problem with the PCB sockets so you may also want to keep an eye on that. I will take some resistance reading of spare SONY balancer board's transformers.
                            Thanks!
                            As I had no way to decide whether it was the transformer or the tube, I decided to pull the transformer to see if a) it would work at all and b) everything else is working. So far, everything else seems fine although I don't have a remote for it so it is a PITA to change settings etc. So that is the next job: find a remote Sony RM-YD025 or compatible model.

                            Comment

                            • jimb0b
                              Member
                              • Oct 2012
                              • 17
                              • Canada

                              #15
                              Re: Sony Bravia 40" LCD Model KDL40s4100

                              Originally posted by tom66
                              It was this video which helped me find the problem. I added a "like" and a comment.

                              Comment

                              • budm
                                Badcaps Legend
                                • Feb 2010
                                • 40746
                                • USA

                                #16
                                Re: Sony Bravia 40" LCD Model KDL40s4100

                                Ah, so the lamp is bad, not the transformer. Thanks for the link to the YouTube, learning something every day, 1200 hours and the lamp already failed, sad.
                                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

                                • jimb0b
                                  Member
                                  • Oct 2012
                                  • 17
                                  • Canada

                                  #17
                                  Re: Sony Bravia 40" LCD Model KDL40s4100

                                  Originally posted by budm
                                  Ah, so the lamp is bad, not the transformer. Thanks for the link to the YouTube, learning something every day, 1200 hours and the lamp already failed, sad.
                                  I don't for sure whether it was the ccfl or the transformer. Removing the transformer covered both possibilities.

                                  Is it possible to remove and replace a ccfl?

                                  Comment

                                  • RenoRJ
                                    New Member
                                    • Feb 2014
                                    • 2
                                    • USA

                                    #18
                                    Re: Sony Bravia 40" LCD Model KDL40s4100

                                    I had the same problem with my Sony KDL-40S4100. Go green then a couple seconds later Standby light would blink twice.

                                    I unplugged the main connector on the inverter board and left the smaller connector on the bottom connected. The tv came up and stayed on no pic just sound.
                                    I pulled the inverter board off very carefully using a plastic wedge tool on the outer side. I found that the third tube up from the bottom connection was broken off. At first I thought why would a circuit that is not drawing anything cause a shutdown. I checked all of the coils went back to that one and yep it spiked. I took a look at the video on U tube.pulled the board and removed the coil and jumped out the 2 outer pins.

                                    Picture came up and I cannot see the missing tube.

                                    Thanks for the info and the link to the video, it helped out a lot.

                                    RJ

                                    Comment

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