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Sony Bravia KDL-52S4100 No picture or Sound

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    Sony Bravia KDL-52S4100 No picture or Sound

    I am looking at my brothers TV he has a Sony Bravia KDL-52S4100 it has no sound or picture. When the power button is depressed the light located under the panel turns green. I removed the back and immediately checked the power supply for bad caps. There were none. I then proceeded to check all of the output voltages on the power supply. They were not perfect, but very close to nominal.

    I then removed CON3 from the power supply which connects to the main board and the back light illuminated. I think there might be a problem with the main board. I have checked to just try to purchase a main board (48.71H01.31), there are none to be found. I assume this must be a huge problem for this model.

    If you have any ideas on where I should start troubleshooting on the main board I would like to hear them.

    I'm looking for my digital camera once I find it I will take better pictures of the boards that in question.
    Attached Files

    #2
    Re: Sony Bravia KDL-52S4100 No picture or Sound

    The part number for the main board for this model is 185722711. I did find a few available but they are horribly expensive. (One site listed it for over $800.00 USD.) So the board replacement option is probably out.

    Comment


      #3
      Re: Sony Bravia KDL-52S4100 No picture or Sound

      Yeah I have even found the set for sale used for $900.00-$1200.00 which is what they were probably going to do is buy it and sell the board for $800.00

      Comment


        #4
        Re: Sony Bravia KDL-52S4100 No picture or Sound

        Did you check the voltage and the surface mounted fuse on the T-CON board yet? This model may use error signal from T-CON board to shutdown (BL_ON) if the T-CON is dead.
        Attached Files
        Last edited by budm; 12-02-2012, 07:05 PM.
        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


          #5
          Re: Sony Bravia KDL-52S4100 No picture or Sound

          I know this is an old post, but I have the exact same problem. I even changed out the motherboard with no improvement. Did you ever find the problem?

          Comment


            #6
            Re: Sony Bravia KDL-52S4100 No picture or Sound

            Originally posted by bumbling808 View Post
            I know this is an old post, but I have the exact same problem. I even changed out the motherboard with no improvement. Did you ever find the problem?
            When you say "motherboard", do you mean the power supply or the main board with all the inputs?
            LG Plasma Mal-Discharge Correction Service

            Comment


              #7
              Re: Sony Bravia KDL-52S4100 No picture or Sound

              I mean the main board. In desperation, I went ahead and ordered a replacement tcon board. Still same problem. I didn't think I needed to replace the power supply because the relay was still working during initial power up and the backlight would go on if I unplugged one of the wires that go to the main board. Should I go ahead an get a replacement power supply board now?
              Attached Files

              Comment


                #8
                Re: Sony Bravia KDL-52S4100 No picture or Sound

                You could have gotten a faulty replacement main board. When it comes to these Sony main boards, I prefer to have them repaired if possible rather than replacing them, or I'd buy from a highly reputable seller who offers a warranty. There are a lot of faulty main boards out there for Sonys. Where did you get the main board?

                http://www.ebay.com/itm/1-857-227-11...item27d34a8e85
                Last edited by capkid; 07-26-2013, 12:27 AM.
                LG Plasma Mal-Discharge Correction Service

                Comment


                  #9
                  Re: Sony Bravia KDL-52S4100 No picture or Sound

                  Yes on ebay, but not that listing. Here's the one I bought. Got the tcon board from the same guy. ebay listing

                  How can I verify which board is the problem?

                  Comment


                    #10
                    Re: Sony Bravia KDL-52S4100 No picture or Sound

                    The link I provided was for a repair service. I had a KDL-46S4100 that did the exact same thing - no backlight until I unplugged the connector. My issue was a bad main board. I don't know of many Sonys that suffer from power supply issues. If your part numbers match and you're still within the time window for returns, you may want to consider returning the main board and using that repair service. It's a bit expensive, but people have had good results using that seller.

                    Edit: I actually bought my main board from Tristate Module, but it doesn't appear to be in stock for your TV: http://www.tristatemodule.com/p-2556...l-52s4100.aspx
                    Last edited by capkid; 07-26-2013, 01:42 AM.
                    LG Plasma Mal-Discharge Correction Service

                    Comment


                      #11
                      Re: Sony Bravia KDL-52S4100 No picture or Sound

                      Old topic. But I now have the same TV with the same issue. I've disconnected the above cable with the same results. I've used a voltmeter to test the voltage. There's 5 volt on the b-on when cable is diconnected but loses it when cable is connected. I'd like to attempt to repair the main board instead of replacing it because it's a little pricey and hard to find in stock. If others can repair then I'm sure I could as well. besides replacing the board, has anyone figured out if an IC is causing this issue. Seems like it's grounding out or something.

                      Comment


                        #12
                        Re: Sony Bravia KDL-52S4100 No picture or Sound

                        Be warned mainboards are not easy to repair, Are you competent using a DMM, Scope and Soldering equipment? Do you have the available tools and materials?

                        If no to any of the above send it for repair

                        Comment


                          #13
                          Re: Sony Bravia KDL-52S4100 No picture or Sound

                          There could be an issue with a BGA, in which case I'd be out.
                          LG Plasma Mal-Discharge Correction Service

                          Comment


                            #14
                            Re: Sony Bravia KDL-52S4100 No picture or Sound

                            Originally posted by newtothis View Post
                            Be warned mainboards are not easy to repair, Are you competent using a DMM, Scope and Soldering equipment? Do you have the available tools and materials?

                            If no to any of the above send it for repair
                            Yes I have a DMM & soldering equipment. I can get my hands on an oscilloscope if needed. If I could find the proper schematic for the board it would help as well. I understand main boards aren't an easy task. I was just wondering what expertise we have available and if anyone has repaired this problem without replacing the board.

                            Comment


                              #15
                              Re: Sony Bravia KDL-52S4100 No picture or Sound

                              with a steady green light , you can try a firmware update, if you can find the firmware, in some cases it fixes the problem, maybe check sony's site for it.
                              Last edited by nomoresonys; 02-15-2015, 09:26 PM.

                              Comment


                                #16
                                Re: Sony Bravia KDL-52S4100 No picture or Sound

                                Firmware update is out of the question. Unfortunately I'm unable to see an image on the screen to attempt an update plus screen went out while watching TV. Can't be a firmware issue.

                                Comment


                                  #17
                                  Re: Sony Bravia KDL-52S4100 No picture or Sound

                                  thats the problem, everyones positive about everything, you dont need to see the screen with the kdl to do an update. bye now.

                                  Comment


                                    #18
                                    Re: Sony Bravia KDL-52S4100 No picture or Sound

                                    I'll just leave this here, just in case: https://www.badcaps.net/forum/showpo...9&postcount=59
                                    LG Plasma Mal-Discharge Correction Service

                                    Comment


                                      #19
                                      Re: Sony Bravia KDL-52S4100 No picture or Sound

                                      Originally posted by nomoresonys View Post
                                      thats the problem, everyones positive about everything, you dont need to see the screen with the kdl to do an update. bye now.
                                      As much as I don't want to admit I was wrong, that fixed the set. You sir are a god. I can't believe that's all it was. I would give you a great big hug if I could. I applaud you

                                      Comment


                                        #20
                                        Re: Sony Bravia KDL-52S4100 No picture or Sound

                                        it happens, ASSUMPTIONS have been screwing people up since time began, including me.
                                        Last edited by nomoresonys; 02-15-2015, 10:21 PM.

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