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    Samsung Le40a456c2d previous image stuck on screen

    hi guys

    just need to confirm if this Tcon board is faulty

    T400XW01 V5 40T01-C00

    VGamma 1 6.86V
    VGamma 6 7.28V
    VGamma 9 7.37V
    VGamma 10 7.55V
    VGamma 11 7.57V
    VGamma 12 6.63V
    VGamma 14 4.89V
    VGamma 17 4.16V
    VGamma 22 0.33V

    Thanks
    Last edited by sordids999; 11-11-2017, 01:47 PM.

    #2
    Re: Samsung Le40a456c2d previous image stuck on screen

    Why some gamma are missing?

    Comment


      #3
      Re: Samsung Le40a456c2d previous image stuck on screen

      and a picture of the screen. I wonder if the problem is on the whole screen, or just an affected area. Usually a faulty Gamma IC just friggs around with the color, solarization etc.
      Last edited by CapLeaker; 11-11-2017, 02:56 PM.

      Comment


        #4
        Re: Samsung Le40a456c2d previous image stuck on screen

        These are the only gamma voltages on the board I can find
        Image uploaded
        Attached Files

        Comment


          #5
          Re: Samsung Le40a456c2d previous image stuck on screen

          I was told the tv was losing colour and sometimes an image is stuck when the picture changes just like plasma burn in but at the moment I can't get the tv to show any faults

          Thanks

          Comment


            #6
            Re: Samsung Le40a456c2d previous image stuck on screen

            check all the pins around the AS15-F. Clean the ribbon cables going to and coming from the TCon.
            Last edited by CapLeaker; 11-11-2017, 03:04 PM.

            Comment


              #7
              Re: Samsung Le40a456c2d previous image stuck on screen

              also attach one ribbon from the t-con at a time and see if it has lag on 1 half only.

              more gamma readings would of been handy. who designs these boards, :P
              but your vgamma 1 is out of sequence, so you may still have an as chip issue.
              WHY CAN'T PHILIPS USE PHILLIPS HEAD SCREWS?

              Comment


                #8
                Re: Samsung Le40a456c2d previous image stuck on screen

                Have you changed already? AS-15 ? if not change it,many problems with gama with as15.

                Comment


                  #9
                  Re: Samsung Le40a456c2d previous image stuck on screen

                  picture of the fault would be better but no fault no fix

                  the few voltages you have given dont look right noting the number 1 value

                  there are repair services for the AS15 gamma chip on ebay if you dont fancy doing it your self

                  Comment


                    #10
                    Re: Samsung Le40a456c2d previous image stuck on screen

                    "check all the pins around the AS15-F" it's risky to measure directly on the chip..
                    the missing gamma testpoints can be on the bottom side..

                    Comment


                      #11
                      Re: Samsung Le40a456c2d previous image stuck on screen

                      Check the negative voltage generator on the TCON.

                      Comment


                        #12
                        Re: Samsung Le40a456c2d previous image stuck on screen

                        If you cannot/don't have tools and skill to change the AS15 Chip on the T-CON Bd. You could probably get one on-line for a reasonable price. Replace the T-CON Bd.

                        Comment


                          #13
                          Re: Samsung Le40a456c2d previous image stuck on screen

                          update ## As15 chip replaced
                          Tv all working again luckily spotted some solarization and brightness issues so changed the chip
                          Thanks

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