Broken RCA L40FHD41YX9

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  • Spork Schivago
    Badcaps Legend
    • Mar 2012
    • 4734
    • United States of America

    #1

    Broken RCA L40FHD41YX9

    Hello,

    I have an RCA L40FHD41YX9 that isn't working. I tore it open and two caps were physically buldging on the PSU. I replaced them and a good cap with some Panasonic FR series caps. I thought maybe that'd fix it. I hook up a video signal and I get nothing. It's like the backlighting isn't kicking on. I see a wire going to the inverter board that has a bunch of pins. A good amount of them in a row are labeled 24v, the other ones are labeled (in a row) gnd. The 24v's all seem to check out and measure around 24v. I pulled the cover off the inverter and checked the four caps. They seem okay.

    Does anyone have any suggestions on what I should check? I can post nicer pictures. I was just hoping someone might be familiar with this system and just be like oh, you should check the blah pins and see if you get blah voltage, if not, check the blah and see if it's broke!

    Thanks!
    Attached Files
    -- Law of Expanding Memory: Applications Will Also Expand Until RAM Is Full
  • budm
    Badcaps Legend
    • Feb 2010
    • 40746
    • USA

    #2
    Re: Broken RCA L40FHD41YX9

    So you have 24V to power the inverter board, now you need to find if it is getting the BL-ON from the main board.
    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

    • Spork Schivago
      Badcaps Legend
      • Mar 2012
      • 4734
      • United States of America

      #3
      Re: Broken RCA L40FHD41YX9

      I knew it! Thanks Budm! So, I'm going to show pictures of the main board and maybe you can help me figure out which signal is the BL_ON. I had found where it was listed on the silkscreen or whatever it's called but I couldn't figure out which pin it actually was.

      It's hard to see, but on this pin, on the PSU, there's actually two layers. I'm sure you know that though. I can't figure out how the labeling on the board goes. Is it the pins in the back or the pins in the front? If that doesn't make second, I can try to explain more with more pictures.
      Attached Files
      -- Law of Expanding Memory: Applications Will Also Expand Until RAM Is Full

      Comment

      • CapLeaker
        Leaking Member
        • Dec 2014
        • 8133
        • Canada

        #4
        Re: Broken RCA L40FHD41YX9

        Measure the DC V of BL_ON.

        Comment

        • Spork Schivago
          Badcaps Legend
          • Mar 2012
          • 4734
          • United States of America

          #5
          Re: Broken RCA L40FHD41YX9

          Originally posted by CapLeaker
          Measure the DC V of BL_ON.
          Right, but which pin is the BL_ON? I tried that last night but there's a back row of pins there. And I can't figure out if it's the front row or the back. The printing on the board isn't exactly clear there.
          -- Law of Expanding Memory: Applications Will Also Expand Until RAM Is Full

          Comment

          • budm
            Badcaps Legend
            • Feb 2010
            • 40746
            • USA

            #6
            Re: Broken RCA L40FHD41YX9

            May be it will be easier to see if there is label on the inverter board.
            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

            • Spork Schivago
              Badcaps Legend
              • Mar 2012
              • 4734
              • United States of America

              #7
              Re: Broken RCA L40FHD41YX9

              Besides the connector that has the 24v and GND connections, there's a 4 pin wire on the inverter. It lists four connections, SYNC, N.C, N.C, GND. Would that be it?

              For the main board, I can measure the front pin and the back. Maybe we can assume because BL_ON is listed last, it's going to be either the last pin in the front row or the last pin in the back row there...
              -- Law of Expanding Memory: Applications Will Also Expand Until RAM Is Full

              Comment

              • budm
                Badcaps Legend
                • Feb 2010
                • 40746
                • USA

                #8
                Re: Broken RCA L40FHD41YX9

                Can we see the pictures of the inverter board? Is there more then one connectors on the board?
                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

                  #9
                  Re: Broken RCA L40FHD41YX9

                  https://www.badcaps.net/forum/attach...9&d=1464795581

                  P5 BL-ON.
                  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

                  • Spork Schivago
                    Badcaps Legend
                    • Mar 2012
                    • 4734
                    • United States of America

                    #10
                    Re: Broken RCA L40FHD41YX9

                    Originally posted by budm
                    Dang, I was looking at the wrong one! I thought for sure the other one that had the BL_ON it was it. I thought the words were just mashing together.

                    I measured it, 4.01VDC.
                    -- Law of Expanding Memory: Applications Will Also Expand Until RAM Is Full

                    Comment

                    • Spork Schivago
                      Badcaps Legend
                      • Mar 2012
                      • 4734
                      • United States of America

                      #11
                      Re: Broken RCA L40FHD41YX9

                      Do you still want pictures of the inverter board? I'm thinking if it's getting the 4.01V BL_ON, then maybe the inverter board isn't working right. What do you think?
                      -- Law of Expanding Memory: Applications Will Also Expand Until RAM Is Full

                      Comment

                      • budm
                        Badcaps Legend
                        • Feb 2010
                        • 40746
                        • USA

                        #12
                        Re: Broken RCA L40FHD41YX9

                        Originally posted by Spork Schivago
                        Do you still want pictures of the inverter board? I'm thinking if it's getting the 4.01V BL_ON, then maybe the inverter board isn't working right. What do you think?
                        Since you have BL-ON then we do need to see the inverter board and also the whole backside of the TV that shows all the boards.
                        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

                        • ReeceyBurger123
                          Never Give Up !
                          • May 2014
                          • 7325
                          • Britain

                          #13
                          Re: Broken RCA L40FHD41YX9

                          Them bad caps probably blew the fuse on the inverter. Get us some images of the inverter please.
                          Please Do Not PM My Page Asking For Help Badcaps Is The Place For Advise, Page Linked For Business Reasons Only. Anyone Doing So Will Be Banned Instantly !

                          https://www.facebook.com/Telford-Tel...7894576335359/

                          Comment

                          • Spork Schivago
                            Badcaps Legend
                            • Mar 2012
                            • 4734
                            • United States of America

                            #14
                            Re: Broken RCA L40FHD41YX9

                            Originally posted by ReeceyBurger123
                            Them bad caps probably blew the fuse on the inverter. Get us some images of the inverter please.
                            Do you guys still want pics of the boards? ReeceyBurger123 was right. I didn't think any fuses would be on the inverter board but sure enough, two 1808 SMD 125V 7A and one of them has infinite continuity. I'm going to order a couple.

                            Should I replace them and then test it or keep testing stuff and when I get everything tested, place an order?
                            -- Law of Expanding Memory: Applications Will Also Expand Until RAM Is Full

                            Comment

                            • ReeceyBurger123
                              Never Give Up !
                              • May 2014
                              • 7325
                              • Britain

                              #15
                              Re: Broken RCA L40FHD41YX9

                              Possibly shorted mosfets too. Can we have images please ?
                              Please Do Not PM My Page Asking For Help Badcaps Is The Place For Advise, Page Linked For Business Reasons Only. Anyone Doing So Will Be Banned Instantly !

                              https://www.facebook.com/Telford-Tel...7894576335359/

                              Comment

                              • Spork Schivago
                                Badcaps Legend
                                • Mar 2012
                                • 4734
                                • United States of America

                                #16
                                Re: Broken RCA L40FHD41YX9

                                I found a 125V 5A, same make. Could I temporarily use that to test the inverter and see if it fixes the TV? And if it does, just order a new replacement and nothing else? Or would that be a bad idea?
                                -- Law of Expanding Memory: Applications Will Also Expand Until RAM Is Full

                                Comment

                                • Spork Schivago
                                  Badcaps Legend
                                  • Mar 2012
                                  • 4734
                                  • United States of America

                                  #17
                                  Re: Broken RCA L40FHD41YX9

                                  Here's some pics...it's a bit awkward to take pics of this. I can send zoomed in clear pics of any area that you guys want. Just let me know if you want anything special.

                                  The way it goes is the first five go together, they make up the whole board. Then you see one part of the back, where it looks really burnt. Then you see the front area, around where the burned mark would be, if the burned mark was on the front...
                                  Attached Files
                                  -- Law of Expanding Memory: Applications Will Also Expand Until RAM Is Full

                                  Comment

                                  • Spork Schivago
                                    Badcaps Legend
                                    • Mar 2012
                                    • 4734
                                    • United States of America

                                    #18
                                    Re: Broken RCA L40FHD41YX9

                                    I wanted to apologize for not responding right away. We're in the process of looking for a house to buy as well. So when I'm waiting for a response, we start looking and then we forget! I hope that's okay. I don't want you guys to think I don't appreciate your help.
                                    -- Law of Expanding Memory: Applications Will Also Expand Until RAM Is Full

                                    Comment

                                    • budm
                                      Badcaps Legend
                                      • Feb 2010
                                      • 40746
                                      • USA

                                      #19
                                      Re: Broken RCA L40FHD41YX9

                                      Get the new board:
                                      http://www.shopjimmy.com/catalogsear...CA+L40FHD41YX9

                                      That burnt mark is the clue, it is another of those SAMSUNG board,
                                      Samsung LJ97-02098A
                                      Last edited by budm; 06-01-2016, 07:54 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

                                      • Spork Schivago
                                        Badcaps Legend
                                        • Mar 2012
                                        • 4734
                                        • United States of America

                                        #20
                                        Re: Broken RCA L40FHD41YX9

                                        Originally posted by budm
                                        Get the new board:
                                        http://www.shopjimmy.com/catalogsear...CA+L40FHD41YX9

                                        That burnt mark is the clue, it is another of those SAMSUNG board,
                                        Samsung LJ97-02098A
                                        They're out of the Samsung LJ97-02098A but they have a rebuild kit, which I don't really want. Can I use the LJ97-02098B? They're out of the 02098B as well. They also sell a repair kit for that. I'd like to know so I can check on other sites. Thanks!
                                        -- Law of Expanding Memory: Applications Will Also Expand Until RAM Is Full

                                        Comment

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