Dynex DX-LCD32-09 No Picture

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  • landyboy
    Badcaps Veteran
    • Apr 2013
    • 443
    • USA

    #1

    Dynex DX-LCD32-09 No Picture

    I picked a freebie on this one. Tested Power Board and all appropriate voltages are present. There is no picture, the person I got it off of said it had sound but I am not really sure of that as I can not hook up a source to it. Any thoughts? Tcon? The power light on the front is Red and when I push the power button it turns green.
    Attached Files
  • landyboy
    Badcaps Veteran
    • Apr 2013
    • 443
    • USA

    #2
    Re: Dynex DX-LCD32-09 No Picture

    I went ahead and tested the test point on the tcon and here is what I get

    VDDA 8.20k 3.350v
    VDDD 7.03K 15.20v
    VGL 20.1k -6.2v
    VGH OL 20.94

    Comment

    • cheapie
      null
      • Jul 2010
      • 849
      • USA

      #3
      Re: Dynex DX-LCD32-09 No Picture

      Holding a flashlight against the panel in a dark room, is there an image? If so, then you need to look at the backlight inverter. If there isn't, then you should check the other boards.

      Comment

      • landyboy
        Badcaps Veteran
        • Apr 2013
        • 443
        • USA

        #4
        Re: Dynex DX-LCD32-09 No Picture

        There does not appear to be a picture

        Comment

        • budm
          Badcaps Legend
          • Feb 2010
          • 40746
          • USA

          #5
          Re: Dynex DX-LCD32-09 No Picture

          So the backlights are not on?
          Pictures of the backlights Inverter board?
          Last edited by budm; 05-07-2013, 11:40 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

          • landyboy
            Badcaps Veteran
            • Apr 2013
            • 443
            • USA

            #6
            Re: Dynex DX-LCD32-09 No Picture

            I don't believe so, I can see no lights. I turned the set on green indicator light hit menu button since I do not have a source and can not see anything in a dark room with a flashlight.

            Comment

            • budm
              Badcaps Legend
              • Feb 2010
              • 40746
              • USA

              #7
              Re: Dynex DX-LCD32-09 No Picture

              So we need to get the backlights to come on. Cannot do much until we see the pictures of the boards and all the voltage labellings on the connectors.
              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

              • landyboy
                Badcaps Veteran
                • Apr 2013
                • 443
                • USA

                #8
                Re: Dynex DX-LCD32-09 No Picture

                From top of board to bottom

                PON 2.503
                GND
                5v 5.179
                G
                G
                16v 15.56
                16v 15.56
                G
                5v 5.108
                G
                9v 9.05
                G
                32v 32.35




                PON 4.827
                PWM 3.277
                G
                G
                G
                24v 23.93
                24v 23.93





                PON 4.826
                PWN 3.277
                G
                G
                G
                G
                G
                24 (5 of them all 23.93)
                Attached Files

                Comment

                • budm
                  Badcaps Legend
                  • Feb 2010
                  • 40746
                  • USA

                  #9
                  Re: Dynex DX-LCD32-09 No Picture

                  So the inverter board is getting the PON (BL_ON) of 4.827, and alos getting the needed 24v (23.93V) if I read the post correctly?
                  If that is the case, I will need good clear pictures of 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

                  • landyboy
                    Badcaps Veteran
                    • Apr 2013
                    • 443
                    • USA

                    #10
                    Re: Dynex DX-LCD32-09 No Picture

                    Yes I believe the inverter is getting the proper voltages. I will post a pic of the inverter soon.

                    Comment

                    • budm
                      Badcaps Legend
                      • Feb 2010
                      • 40746
                      • USA

                      #11
                      Re: Dynex DX-LCD32-09 No Picture

                      There are more than one version of this TV model, as you can see, there are more thna one type of inverter board.
                      http://www.shopjimmy.com/catalogsear...ex+DX-LCD32-09
                      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

                      • landyboy
                        Badcaps Veteran
                        • Apr 2013
                        • 443
                        • USA

                        #12
                        Re: Dynex DX-LCD32-09 No Picture

                        Here are the pics of the inverter board
                        Attached Files

                        Comment

                        • budm
                          Badcaps Legend
                          • Feb 2010
                          • 40746
                          • USA

                          #13
                          Re: Dynex DX-LCD32-09 No Picture

                          Check the black F1 fuse with '20' on it, more likely to be blown.
                          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

                          • landyboy
                            Badcaps Veteran
                            • Apr 2013
                            • 443
                            • USA

                            #14
                            Re: Dynex DX-LCD32-09 No Picture

                            I see a f201 ans a f301 but I'm not seing a F1 with a 20 on it although I may be blind and am just overlooking it.

                            Comment

                            • landyboy
                              Badcaps Veteran
                              • Apr 2013
                              • 443
                              • USA

                              #15
                              Re: Dynex DX-LCD32-09 No Picture

                              Ok I did find it it is testing 15K ohms across the fuse. If i'm correct it should read 0 ohms?

                              Comment

                              • retiredcaps
                                Badcaps Legend
                                • Apr 2010
                                • 9271

                                #16
                                Re: Dynex DX-LCD32-09 No Picture

                                Originally posted by landyboy
                                Ok I did find it it is testing 15K ohms across the fuse. If i'm correct it should read 0 ohms?
                                F1 is bad. A good fuse should measure less than 1.0 ohms.
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                                Comment

                                • landyboy
                                  Badcaps Veteran
                                  • Apr 2013
                                  • 443
                                  • USA

                                  #17
                                  Re: Dynex DX-LCD32-09 No Picture

                                  Are they hard to solder in? I have done caps and diodes but this seems a little smaller. Can it be bypassed temporarily to prove that it is the only fault? Thanks!

                                  Comment

                                  • retiredcaps
                                    Badcaps Legend
                                    • Apr 2010
                                    • 9271

                                    #18
                                    Re: Dynex DX-LCD32-09 No Picture

                                    Originally posted by landyboy
                                    Are they hard to solder in?
                                    Like anything, practice helps. See

                                    http://www.youtube.com/watch?v=3NN7UGWYmBY

                                    Can it be bypassed temporarily to prove that it is the only fault?
                                    Personally, I would not jumper a fuse for any reason. It is there for a reason. A component around it could be shorted or bad causing the fuse to blow. Sometimes a fuse does go bad on its own.
                                    --- begin sig file ---

                                    If you are new to this forum, we can help a lot more if you please post clear focused pictures (max resolution 2000x2000 and 2MB) of your boards using the manage attachments button so they are hosted here. Information and picture clarity compositions should look like this post.

                                    We respectfully ask that you make some time and effort to read some of the guides available for basic troubleshooting. After you have read through them, then ask clarification questions or report your findings.

                                    Please do not post inline and offsite as they slow down the loading of pages.

                                    --- end sig file ---

                                    Comment

                                    • landyboy
                                      Badcaps Veteran
                                      • Apr 2013
                                      • 443
                                      • USA

                                      #19
                                      Re: Dynex DX-LCD32-09 No Picture

                                      Ok, I will give it a try. One last question. Is the 20 a reference to 20 amps or 20 ma? Digikey?

                                      Comment

                                      • landyboy
                                        Badcaps Veteran
                                        • Apr 2013
                                        • 443
                                        • USA

                                        #20
                                        Re: Dynex DX-LCD32-09 No Picture

                                        I made a temp 1a fuse assembly and it appears the back lighting comes on. I have read you can solder the new fuse on top of the old one, is that recommended?

                                        Comment

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