JVC LT-32A61SU bad picture

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  • coojoe_213
    Senior Member
    • Nov 2015
    • 105
    • bulgaria

    #1

    JVC LT-32A61SU bad picture

    Hi all.
    I have this tv, when i turn on tv without signal, everything is perfect /i have perfect blue screen, perfect ''menu panel''/.
    When i put the cable for tv, or then i connect dvd or blu ray player, the picture is.....some of solarized or ... i don't know...., but the menu panel is still perfect.

    I thing..., may be chip AS15-F on the t-con, but i don't have this chip on the t-con.
    On the t-con i have 32 pin chip MAXIM1518E.
    Should I check the Tcon or the Mainboard first?
    Attached Files
    Last edited by coojoe_213; 08-31-2016, 02:52 PM.
  • dick_barton
    Badcaps Legend
    • Aug 2015
    • 6642
    • Wales

    #2
    Re: JVC LT-32A61SU bad picture

    Post a phoro of your circuit boards.
    Willing to help but I'm no expert.

    Comment

    • Andrew F. Ali
      Badcaps Legend
      • Jan 2014
      • 2450
      • Trinidad & Tobago

      #3
      Re: JVC LT-32A61SU bad picture

      Let's see pics of your symptom please.

      Comment

      • coojoe_213
        Senior Member
        • Nov 2015
        • 105
        • bulgaria

        #4
        Re: JVC LT-32A61SU bad picture

        Pics 4, 5 and 6 of first post is a pictures with symptoms /bad pictures/.

        Here is a serv. maunal:
        Attached Files
        Last edited by coojoe_213; 08-31-2016, 03:53 PM.

        Comment

        • dick_barton
          Badcaps Legend
          • Aug 2015
          • 6642
          • Wales

          #5
          Re: JVC LT-32A61SU bad picture

          it does look like a Tcon fault but better to see what others think. There are various voltage points on the Tcon board which you could measure the volatges at.
          V3D3, V5V, VGHC, VGH, V2D5 etc.
          Willing to help but I'm no expert.

          Comment

          • coojoe_213
            Senior Member
            • Nov 2015
            • 105
            • bulgaria

            #6
            Re: JVC LT-32A61SU bad picture

            All GAMMA voltages is no more than 1.30V (0.98, 1.13, 1.26, 0.18 V etc), this is may be bad.

            Here is voltage on my T-con:

            2VS/DC- 4.91V
            VGHC-26.1V
            VGH-26.6
            VGL-6.1V
            VCOM2-6.1V
            COMF2-6.1V
            VIN-3.31V
            V2D5-2.5V
            AVDD-13.6V
            V5V-5.0V
            V3D3-3.3V
            ASYC RST-3.3V
            LVDS- 3.23V
            VGMA- 12.91V
            V2REF1 - 2.5V
            REF/F1-12.86V
            Attached Files
            Last edited by coojoe_213; 09-01-2016, 06:28 AM.

            Comment

            • dick_barton
              Badcaps Legend
              • Aug 2015
              • 6642
              • Wales

              #7
              Re: JVC LT-32A61SU bad picture

              The supply voltages look reasonable and the reference voltages appear to be there. Looks like you may be right and the gamma chip is faulty.
              Willing to help but I'm no expert.

              Comment

              • coojoe_213
                Senior Member
                • Nov 2015
                • 105
                • bulgaria

                #8
                Re: JVC LT-32A61SU bad picture

                Thanks for reply, i'll buy this one from aliexpress
                http://www.aliexpress.com/item/MAX15...e-b1b118556ea8

                Comment

                • dick_barton
                  Badcaps Legend
                  • Aug 2015
                  • 6642
                  • Wales

                  #9
                  Re: JVC LT-32A61SU bad picture

                  That center area of the chip will be soldered onto the pcb. Do you have the equipment to remove it?
                  Willing to help but I'm no expert.

                  Comment

                  • coojoe_213
                    Senior Member
                    • Nov 2015
                    • 105
                    • bulgaria

                    #10
                    Re: JVC LT-32A61SU bad picture

                    Yes, i know. I find in Bulgaria this chip. Saturday will be here. I'll post a pics.

                    Comment

                    • coojoe_213
                      Senior Member
                      • Nov 2015
                      • 105
                      • bulgaria

                      #11
                      Re: JVC LT-32A61SU bad picture

                      The problem is on main board. I find worked t-con, and when i replaced t-con, the problem was the same. Thanks all for help.

                      Comment

                      • kc8adu
                        Super Moderator
                        • Nov 2003
                        • 8832
                        • U.S.A!

                        #12
                        Re: JVC LT-32A61SU bad picture

                        not sure how mainboard can do that.thats a gamma regulator issue.
                        i suspect your replacement tcon is bad too.

                        Comment

                        • coojoe_213
                          Senior Member
                          • Nov 2015
                          • 105
                          • bulgaria

                          #13
                          Re: JVC LT-32A61SU bad picture

                          No, i told you. I find anather one, which work, absolutly same number part, and the problem was same. What you thing about AV Processor on main board?

                          Comment

                          • Kilroys
                            Senior Member
                            • Feb 2014
                            • 70
                            • Sweden

                            #14
                            Re: JVC LT-32A61SU bad picture

                            Or could it be noise in the picture as the service informations said
                            Attached Files

                            Comment

                            • coojoe_213
                              Senior Member
                              • Nov 2015
                              • 105
                              • bulgaria

                              #15
                              Re: JVC LT-32A61SU bad picture

                              Originally posted by Kilroys
                              Or could it be noise in the picture as the service informations said
                              Thanks a lot. Excellent information!!!

                              Comment

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