Samsung LNT3242H with display issues

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  • ozone
    New Member
    • Apr 2014
    • 7
    • USA

    #1

    Samsung LNT3242H with display issues

    I bought this TV years ago and it never gave any trouble until just a few weeks ago. It's probably just a coincidence, but it only started after the TV was moved to an upstairs bedroom (No, I didn't drop it ;-P). Anyway, the problem started out as intermittent and now seems to be continuous. I'll describe it as best I can and refer to some pics I took. The picture now appears very bright and the black level looks greenish instead of black. The picture also looks oversaturated and has very high contrast. I was afraid of burning out the lamp or display, so I quit using it. I took the back off the unit the other day and did a visual inspection. I cannot see any bulging caps or cracked solder joints, nor can I see anything that looks as though it might have overheated or leaked. I have yet to check components or any voltage levels with my multimeter. Because of the preponderance of bad caps around these days, I originally thought it might have been something on the PS board that was sending an overvoltage to the display. But now I am not so sure. The pictures were taken of a DVD image on pause (over-the-air transmissions exhibit the same symptoms). The first picture is from our 60” LG which is working fine. The second shows the same image on the 32” Samsung. The third picture is a close-up of the same Samsung image showing the greenish “black” background and what appear to be dead pixels but really aren't. Any suggestions as to what could be causing this and where to start looking?
    Attached Files
  • tom66
    EVs Rule
    • Apr 2011
    • 32560
    • UK

    #2
    Re: Samsung LNT3242H with display issues

    First I would check LVDS cable is properly seated; this is internal to the unit, running between the main board and T-con board. If it is, I would then ask for a picture of the T-con as there is a common fault called a "gamma reference fault" which can sometimes cause this problem.
    Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
    For service manual, schematic, boardview (board view), datasheet, cad - use our search.

    Comment

    • budm
      Badcaps Legend
      • Feb 2010
      • 40746
      • USA

      #3
      Re: Samsung LNT3242H with display issues

      It looks like GAMMA voltage problem on the T-CON board. What does the pictures like with pictures that has more lighter back ground?
      If your TV uses this T-CON board, it does have the famous AS15 GAMMA ICs that are failing like flies.
      http://www.shopjimmy.com/media/catal...bn8101868a.jpg
      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

      • ozone
        New Member
        • Apr 2014
        • 7
        • USA

        #4
        Re: Samsung LNT3242H with display issues

        OK, here's where I'm at now. The LVDS cable was removed from the signal processor side yesterday when I did a visual of that board and I don't see a connector issue on that side. I located the T-con board at the top of the TV and removed the LVDS cable from the T-con side. Looked fine. I also removed two ribbon cables at the top of the board. Those look fine as well. I removed the board and did a visual inspection which told me nothing new. Is this the board that has issues? (see pic). If I still need to shoot a pic of the screen with a whiter background, I'll have to reassemble everything first. Just let me know.

        p.s. Thanks guys for a prompt reply to this.
        Attached Files

        Comment

        • budm
          Badcaps Legend
          • Feb 2010
          • 40746
          • USA

          #5
          Re: Samsung LNT3242H with display issues

          See those small square copper pads on the T-CON board with GMxx? Take the DC Voltage readings, black probe on the chassis.
          By CN1 you can see GM1, GM2, GM3, GM4.
          By CN2 you can see GM5~GM14.
          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

          • ozone
            New Member
            • Apr 2014
            • 7
            • USA

            #6
            Re: Samsung LNT3242H with display issues

            OK, I reinstalled the T-con board (without metal cover) and took the GM1-GM14 voltage readings (Fluke DMM). This was with an image on the TV that was whiter than the previous pics. Here's what I got:

            GM1 13.06 VDC
            GM2 10.66 VDC
            GM3 11.84 VDC
            GM4 11.98 VDC
            GM5 8.98 VDC
            GM6 7.53 VDC
            GM7 7.07 VDC
            GM8 10.29 VDC
            GM9 6.512 VDC
            GM10 5.07 VDC
            GM11 4.526 VDC
            GM12 3.818 VDC
            GM13 3.028 VDC
            GM14 0.008 VDC

            It's getting late so I'll check back tomorrow sometime to see your response. Thanks again.

            Comment

            • budm
              Badcaps Legend
              • Feb 2010
              • 40746
              • USA

              #7
              Re: Samsung LNT3242H with display issues

              The voltages are bad. You need new T-CON 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

              • audiofreak19
                Badcaps Veteran
                • Apr 2013
                • 556
                • usa

                #8
                Re: Samsung LNT3242H with display issues

                I got one if u need one. Pm me if interested.

                Comment

                • photon8
                  New Member
                  • Sep 2014
                  • 1
                  • usa

                  #9
                  Re: Samsung LNT3242H with display issues

                  Having the same problem on my Samsung (same model). Did the TCON board work? I'm a new member to this forum (just found it via searching). Audiofreak19 I'm interested in a TCON board, but don't appear to be able to access your profile yet to PM you.

                  Comment

                  • jbar2016
                    New Member
                    • Oct 2014
                    • 1
                    • United States

                    #10
                    Re: Samsung LNT3242H with display issues

                    i am having this same issue, and looking for a replacement tcon

                    Comment

                    • budm
                      Badcaps Legend
                      • Feb 2010
                      • 40746
                      • USA

                      #11
                      Re: Samsung LNT3242H with display issues

                      Did you try shopjimmy.com?
                      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

                      • Sue1Bugs2
                        New Member
                        • Sep 2016
                        • 1
                        • USA

                        #12
                        Re: Samsung LNT3242H with display issues

                        I have a Samsung LN-T3242H, I'm wondering if the t-con replacement would fix the problem I'm having. There is 'shadowing' over the center (similar to the initial poster's center picture), it's getting a little dark on one edge (kinda spotty) and a 'ghosty' lighter vertical line, about 3" wide on the opposite side of the screen. I'd post a picture but, I'm new here so I can't! Any input will be greatly appreciated!

                        Comment

                        • noledud
                          Badcaps Veteran
                          • Dec 2013
                          • 413
                          • united kingdom

                          #13
                          Re: Samsung LNT3242H with display issues

                          In regards to the AS15 fault i just used someone off ebay, there are a few sellers offering a service to replace the IC.

                          I just search for AS15 repair or the TCON part number

                          Comment

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