Samsung LN46D550K1FXZA No Image

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  • eagle00799
    Badcaps Veteran
    • May 2012
    • 322
    • USA
    #1

    Samsung LN46D550K1FXZA No Image

    I have sound and backlights but no image so I replaced the t-con board from ShopJimmy but the problem is the same. All voltages are checking out good, 13v,5v and 3.3v are there and the 12 volts on the t-con board is there. I have heard Samsung had some bad panels but I can't imagine it just stops working. When I power the tv on the red power light will flash 5 times then I can see a flash in the lower right of the screen, backlights will come on and sound will come on but no images. Unfortunately I do not have the remote for this tv.
    Attached Files
    Tags: None
    • budm
      Badcaps Legend
      • Feb 2010
      • 40746
      • USA
      #2
      Re: Samsung LN46D550K1FXZA No Image

      What happen if you have the ribbon cables between the LCD panel and the T-CON board connected one at a time?
      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

        • eagle00799
          Badcaps Veteran
          • May 2012
          • 322
          • USA
          #3
          Re: Samsung LN46D550K1FXZA No Image

          No change at all

            Comment

            • budm
              Badcaps Legend
              • Feb 2010
              • 40746
              • USA
              #4
              Re: Samsung LN46D550K1FXZA No Image

              Nest thing to do is to verify if the main board is sending the signals through the LVDS cables to the T-CON or not but you will need the scope to do that.
              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

                • eagle00799
                  Badcaps Veteran
                  • May 2012
                  • 322
                  • USA
                  #5
                  Re: Samsung LN46D550K1FXZA No Image

                  Budm, i replaced the main board as well with one from shopjimmy and no change.

                    Comment

                    • eagle00799
                      Badcaps Veteran
                      • May 2012
                      • 322
                      • USA
                      #6
                      Re: Samsung LN46D550K1FXZA No Image

                      Maybe i should test the cable itself.

                        Comment

                        • eagle00799
                          Badcaps Veteran
                          • May 2012
                          • 322
                          • USA
                          #7
                          Re: Samsung LN46D550K1FXZA No Image

                          On the P_DIM I get 2.05v , is that sufficient voltage?

                            Comment

                            • Diah
                              Badcaps Legend
                              • Feb 2013
                              • 6357
                              • Germany
                              #8
                              Re: Samsung LN46D550K1FXZA No Image

                              Originally posted by eagle00799
                              On the P_DIM I get 2.05v , is that sufficient voltage?
                              go down to the LCD and there are DUMY left and right side they are Fuse, check them and post here

                                Comment

                                • eagle00799
                                  Badcaps Veteran
                                  • May 2012
                                  • 322
                                  • USA
                                  #9
                                  Re: Samsung LN46D550K1FXZA No Image

                                  I don't see any fuse on those boards,
                                  Attached Files

                                    Comment

                                    • budm
                                      Badcaps Legend
                                      • Feb 2010
                                      • 40746
                                      • USA
                                      #10
                                      Re: Samsung LN46D550K1FXZA No Image

                                      Originally posted by eagle00799
                                      On the P_DIM I get 2.05v , is that sufficient voltage?
                                      That is the Backlights dimming control signal.
                                      I doubt that you will find SMD fuses of those tab bonding boards, it is not one of those LCD panel with integrated T-CON panel type.
                                      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

                                        • Diah
                                          Badcaps Legend
                                          • Feb 2013
                                          • 6357
                                          • Germany
                                          #11
                                          Re: Samsung LN46D550K1FXZA No Image

                                          Originally posted by eagle00799
                                          I don't see any fuse on those boards,
                                          picture 1 on the top right over the hole !!! ist DUMMY?
                                          Last edited by Diah; 03-03-2016, 01:49 AM.

                                            Comment

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