samsung UN46D6450UF - no picture. Test TCON?

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  • digitalscorpion
    Member
    • Mar 2012
    • 37
    • USA
    #1

    samsung UN46D6450UF - no picture. Test TCON?

    Model: UN46D6450UF
    I'm at a point where i'm attempting to determine failure as TCON or bad panel.

    TCON part#: LJ94-23176E (SH120PMB4SV0.3, LSJ460HW01-S)

    I have tested fuse on tcon (12v) and have tested some voltages at test points near the LVDS input (~1.5-1.8v). I have tested some voltages at the panel flex cable connectors on the tcon (less than 1v on most except for like the last 2 pins ~1.5-1.8v).
    I have also done the flex cable removal to see if the half image shows and there is no change regardless of 1 cable, both cables, zero cables, etc.
    Unfortunately i can't find a schematic (people even use those anymore??) of the TCON board so i'm not sure if my end voltages before the panel are legit.

    Any tips?
    Tags: None
    • nomoresonys
      Badcaps Legend
      • Jan 2013
      • 12075
      • U.S.
      #2
      Re: samsung UN46D6450UF - no picture. Test TCON?

      Test: with tv unplugged from power, unhook cable from powerboard to mainboard, leave unhooked, plug power cord back into powerboard, see if backlights come on and stay on, test is for if you don't have backlights working.

        Comment

        • digitalscorpion
          Member
          • Mar 2012
          • 37
          • USA
          #3
          Re: samsung UN46D6450UF - no picture. Test TCON?

          Originally posted by nomoresonys
          Test: with tv unplugged from power, unhook cable from powerboard to mainboard, leave unhooked, plug power cord back into powerboard, see if backlights come on and stay on, test is for if you don't have backlights working.
          I didn't do this exact test, but my backlights are functioning properly. I'm getting no video display (no picture, no OSD). Backlights stay on at power up.

            Comment

            • nomoresonys
              Badcaps Legend
              • Jan 2013
              • 12075
              • U.S.
              #4
              Re: samsung UN46D6450UF - no picture. Test TCON?

              Ok, wasn't sure if you had backlights, try shining flashlight on screen maybe hit menu button see if you see any text or anything going on.

                Comment

                • budm
                  Badcaps Legend
                  • Feb 2010
                  • 40746
                  • USA
                  #5
                  Re: samsung UN46D6450UF - no picture. Test TCON?

                  Can we get high res straight shot pictures of YOUR T-CON board so we can see the test points?
                  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

                    • nomoresonys
                      Badcaps Legend
                      • Jan 2013
                      • 12075
                      • U.S.
                      #6
                      Re: samsung UN46D6450UF - no picture. Test TCON?

                      .

                        Comment

                        • digitalscorpion
                          Member
                          • Mar 2012
                          • 37
                          • USA
                          #7
                          Re: samsung UN46D6450UF - no picture. Test TCON?

                          Originally posted by budm
                          Can we get high res straight shot pictures of YOUR T-CON board so we can see the test points?


                          sorry it was faster for me to snag pic from jimmy. So I have voltages coming in and some voltages at test points going into panel flex cables. Just not sure if those voltages are good or what they should even be.

                            Comment

                            • budm
                              Badcaps Legend
                              • Feb 2010
                              • 40746
                              • USA
                              #8
                              Re: samsung UN46D6450UF - no picture. Test TCON?

                              I see at least these test points:
                              VONE =
                              VOFFE =
                              VCC12 =
                              VDDMHL =
                              AVDD =
                              VIN_12V =
                              VCC33 =
                              VCC18 =
                              Also need the P/N of the LCD bias power supply ICD1 (on the left side of 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

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