sony tcon t400hw01 v3 no picture

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  • freakaftr8
    Badcaps Legend
    • Oct 2012
    • 3743
    • USA

    #1

    sony tcon t400hw01 v3 no picture

    so I have found another one of these boards and even though my working board works in this TV this one produces no picture good backlight. The first thing that comes to mind is a dead as15 IC. Can this IC cause no image?
    Did I leave the soldering iron on?
  • budm
    Badcaps Legend
    • Feb 2010
    • 40746
    • USA

    #2
    Re: sony tcon t400hw01 v3 no picture

    I would see if it has voltage test points, VGMA Gamma test points, etc to see what you get. Fuse is good, right? Since you do have working board to do comparison test which will makes it a lot easier.
    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

    • freakaftr8
      Badcaps Legend
      • Oct 2012
      • 3743
      • USA

      #3
      Re: sony tcon t400hw01 v3 no picture

      Yes fuse is good. Vgamma 1 starts at 14v. steadily declined as I go up And then vgamma 11 and 12 which are the last on the list show 0v
      Did I leave the soldering iron on?

      Comment

      • budm
        Badcaps Legend
        • Feb 2010
        • 40746
        • USA

        #4
        Re: sony tcon t400hw01 v3 no picture

        Are there any voltage test points on the board? I.E. 3V3. 1V8, etc.
        Pictures 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

        • freakaftr8
          Badcaps Legend
          • Oct 2012
          • 3743
          • USA

          #5
          Re: sony tcon t400hw01 v3 no picture

          Nevermind

          Vgamma1 14.8v
          Vgamma2 1.8v
          Vgamma3 10.0
          Vgamma4 9.44
          Vgamma5 9.361
          Vgamma6 7.081
          Vgamma7 6.096
          Vgamma8 4.558
          Vgamma9 4.188
          Vgamma10 3.4
          Vgamma11 2.2
          Vgamma12 0.3

          I might add that after two or three minutes of the TV being on it shuts down with a 12 blink Code
          Did I leave the soldering iron on?

          Comment

          • freakaftr8
            Badcaps Legend
            • Oct 2012
            • 3743
            • USA

            #6
            Re: sony tcon t400hw01 v3 no picture

            looking for voltage test points now
            Did I leave the soldering iron on?

            Comment

            • freakaftr8
              Badcaps Legend
              • Oct 2012
              • 3743
              • USA

              #7
              Re: sony tcon t400hw01 v3 no picture

              What's with vgamma 2 having a low voltage?
              Also noticed it's fluctuating all over the place between 1.2 and 1.4v.
              Last edited by freakaftr8; 12-09-2014, 12:07 AM.
              Did I leave the soldering iron on?

              Comment

              • freakaftr8
                Badcaps Legend
                • Oct 2012
                • 3743
                • USA

                #8
                Re: sony tcon t400hw01 v3 no picture

                Here the board and but seem to be getting 1.8 2.5 3.3 12 volts and other various voltages but I have noticed that if you look at the picture the very lowest Coil there's nothing. It would be at the bottom of the board. Sorry the pictures are upside down

                also I noticed if I leave one side the panel unplugged it turns white so obviously its getting voltage of some type
                Attached Files
                Last edited by freakaftr8; 12-09-2014, 12:09 AM.
                Did I leave the soldering iron on?

                Comment

                • budm
                  Badcaps Legend
                  • Feb 2010
                  • 40746
                  • USA

                  #9
                  Re: sony tcon t400hw01 v3 no picture

                  Those 3 coils are for switching power supplies. There should be VGL (-), VGH (+) test points on the board some where which I do not remember what they should be.
                  You can look up the spec sheet for U201, 202, and 203 to see how they function.
                  Last edited by budm; 12-09-2014, 12:15 AM.
                  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

                  • freakaftr8
                    Badcaps Legend
                    • Oct 2012
                    • 3743
                    • USA

                    #10
                    Re: sony tcon t400hw01 v3 no picture

                    Vgl1 is reading -5.999vdc
                    Vgh1 is reading 30.0vdc
                    Did I leave the soldering iron on?

                    Comment

                    • budm
                      Badcaps Legend
                      • Feb 2010
                      • 40746
                      • USA

                      #11
                      Re: sony tcon t400hw01 v3 no picture

                      Tom66 can tell you more as to what they should be.
                      According to this, your Voltage is about right:
                      https://cdn.badcaps-static.com/pdfs/...6c316493a3.pdf
                      Last edited by budm; 12-09-2014, 12:37 AM.
                      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

                      • budm
                        Badcaps Legend
                        • Feb 2010
                        • 40746
                        • USA

                        #12
                        Re: sony tcon t400hw01 v3 no picture

                        BTW, what did you find as far as the voltage comparison readings between the two boards?
                        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

                        • freakaftr8
                          Badcaps Legend
                          • Oct 2012
                          • 3743
                          • USA

                          #13
                          Re: sony tcon t400hw01 v3 no picture

                          Hard to tell. This board is a different version that is interchangeable in this sony. I bought it off eBay cheap. there are two different boards that were supplied with this TV the one that you see now is the earlier of the two boards then there was a change in the model year and they supplied the other board and I'm having a problem with but I thought I'd give a go at this kind of board Since I'm waiting on my voltage regulators for the other t-con board
                          Did I leave the soldering iron on?

                          Comment

                          • freakaftr8
                            Badcaps Legend
                            • Oct 2012
                            • 3743
                            • USA

                            #14
                            Re: sony tcon t400hw01 v3 no picture

                            So is vgamma 2 supposed to be low and bouncing around a few tenths of a volt?
                            Did I leave the soldering iron on?

                            Comment

                            • freakaftr8
                              Badcaps Legend
                              • Oct 2012
                              • 3743
                              • USA

                              #15
                              Re: sony tcon t400hw01 v3 no picture

                              Well looked all over the forums about gamma ics and it seems that when there's a dead spot in the readings it most certainly is bad. Just want to get a perspective before replacing it just in case there's a chance this is normal.

                              Just to recap. .

                              I have no picture just backlights on this tcon. Shuts down with error 12. Tv is fine. Works well with other tcon.

                              Tv model is kdl-46xbr6.
                              Did I leave the soldering iron on?

                              Comment

                              • freakaftr8
                                Badcaps Legend
                                • Oct 2012
                                • 3743
                                • USA

                                #16
                                Re: sony tcon t400hw01 v3 no picture

                                Well replaced AS15-F. Still no picture. Oddly all my gamma readings are now correct. Any ideas? Looks like voltages are all there except the coil on the very bottom.
                                Did I leave the soldering iron on?

                                Comment

                                • freakaftr8
                                  Badcaps Legend
                                  • Oct 2012
                                  • 3743
                                  • USA

                                  #17
                                  Re: sony tcon t400hw01 v3 no picture

                                  does anyone have spec sheets on this board? I believe it's sending voltage to the panel because I can pull one ribbon cable off in the other side turns white unlike a completely dead t-con. So obviously the video signal is blanked out
                                  Did I leave the soldering iron on?

                                  Comment

                                  • budm
                                    Badcaps Legend
                                    • Feb 2010
                                    • 40746
                                    • USA

                                    #18
                                    Re: sony tcon t400hw01 v3 no picture

                                    You need to locate the spec sheets of those 3 ICs to see what they are and how they function.
                                    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

                                    • freakaftr8
                                      Badcaps Legend
                                      • Oct 2012
                                      • 3743
                                      • USA

                                      #19
                                      Re: sony tcon t400hw01 v3 no picture

                                      Bud are you talking about u201 u202 and u203? (Seen in first picture in post number 8)
                                      Did I leave the soldering iron on?

                                      Comment

                                      • freakaftr8
                                        Badcaps Legend
                                        • Oct 2012
                                        • 3743
                                        • USA

                                        #20
                                        Re: sony tcon t400hw01 v3 no picture

                                        Here's what I got on the IC. Does it make sense to you? I understand is a bias supply voltage ic. Texas instrument Tps65161
                                        Attached Files
                                        Did I leave the soldering iron on?

                                        Comment

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