Vizio - XVT472SV

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  • jasenpeters
    Senior Member
    • Sep 2015
    • 53
    • USA

    #1

    Vizio - XVT472SV

    Make : Vizio
    Model Number : XVT472SV
    Serial Number : LSPGMAK5301127

    ---------------------------------------
    Symptoms
    ---------------------------------------
    Plugged In - Visio Logo is Amber/Orange
    Power On - Visio Logo is White, Back lighting is on, No picture, menu, etc.

    ---------------------------------------
    Module ID's
    --------------------------------------
    LG Display : LC470WUL (SB)(M3)
    Main Logic Board : 0171-2272-2896, 3647-0282-0150(6b)
    Power Board : 0500-0507-0710, Delta DPS-286BP
    T-CON Board : KLS-470WLTD CI(3)

    ---------------------------------------
    Main Logic Board
    --------------------------------------
    -- Fuses
    F1 - 5.95v
    F2 - 14.1v

    -- LDO Voltage Regulators (small package)
    Chip Package Markings
    1st Line: L271
    2nd Line: G9117

    Code:
     Pin  3    2    1
        In  Out/Tab  Adjust  Diff(1-2)
     ---------------------------------------
     U2  5.88  3.81   2.38   1.43
     U4  3.90  1.46   0.00   1.46
     U6 13.95  9.42   7.97   1.45
     U7  5.90  3.83   2.38   1.45
    -- Voltage Regulators (large package)
    Chip Package Markings
    1st Line: L391
    2nd Line: G1084

    Code:
     Tab Up, Left to Right
     Pin  1   2/Tab   3
     -----------------------------
     U3  2.45  3.93  5.97
     U5  2.39  3.87  5.97
    ---------------------------------------
    Power Board
    --------------------------------------
    -- Voltages at Connectors
    Code:
     Label  Voltage (DC) Notes
     ------ ------------ --------------------
     A    0.00 / 3.75  Pwr Off / Pwr On
     B    0.00 / 2.95  Pwr Off / Pwr On
     PSON  0.06 / 3.80  Pwr Off / Pwr On
     +5VSB  5.95 / 5.95  Pwr Off / Pwr On
     12V   0.00 / 14.1  Pwr Off / Pwr On
     18V   0.00 / 21.5  Pwr Off / Pwr On
     24V   0.00 / 27.5  Pwr Off / Pwr On
     SGND  0.00
     SGND2  0.00
     SGND3  0.00
    ---------------------------------------
    T-CON Board
    --------------------------------------
    -- Fuses
    F1 - 27.5v
    F2 - 27.5v

    -- LED D302 is flashing red 1/sec


    Other information:
    Voltages seemed to creep up higher at about 1mV per second and then level off at about 1 volt above beginning voltage.
    For example: +5VSB started at about 5.35v then crept up to about 6.05v over a 10 minute period, then leveled off afterwards.

    The Vref on the G9117 LDO's seems a bit high ~1.50v versus standard 1.25v
    Voltages at the Power Board, +5VSB, 12, 18, and 24, seem to be a few volts higher as well.

    Any ideas?

    Thanks in Advance

    NOTE: I used the "CODE" keyword to format the Voltage Data
    Attached Files
  • budm
    Badcaps Legend
    • Feb 2010
    • 40746
    • USA

    #2
    Re: Vizio - XVT472SV

    You should check your meter's batteries first, the readings are high which tends to mean the battery is low.
    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

    • jasenpeters
      Senior Member
      • Sep 2015
      • 53
      • USA

      #3
      Re: Vizio - XVT472SV

      I will check the battery for the DVM.
      Any idea on the submitted values?
      or Should I re-read the voltages?

      Symptom: Back light on, no Image, Video, Menu, etc.

      Comment

      • budm
        Badcaps Legend
        • Feb 2010
        • 40746
        • USA

        #4
        Re: Vizio - XVT472SV

        "or Should I re-read the voltages?" Yes, so far the control Voltages are present, you probably check to see if you do dcv at both ends of the fuse on the t-con board with ref to the chassis GND.
        Also up load the pictures of the whole back side of the TV so we can see 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

        • jasenpeters
          Senior Member
          • Sep 2015
          • 53
          • USA

          #5
          Re: Vizio - XVT472SV

          Make : Vizio
          Model Number : XVT472SV
          Serial Number : LSPGMAK5301127

          ---------------------------------------
          Symptoms
          ---------------------------------------
          Plugged In - Visio Logo is Amber/Orange
          Power On - Visio Logo is White, Back lighting is on, No picture, menu, etc.

          ---------------------------------------
          Module ID's
          --------------------------------------
          LG Display : LC470WUL (SB)(M3)
          Main Logic Board : 0171-2272-2896, 3647-0282-0150(6b)
          Power Board : 0500-0507-0710, Delta DPS-286BP
          T-CON Board : KLS-470WLTD CI(3)

          ---------------------------------------
          Main Logic Board
          --------------------------------------
          -- Fuses
          Code:
              Pwr Off    Pwr On 
             In  Out   In  Out
          F1 - 5.18 5.18  5.14 5.12 <- Diff = 0.02
          F2 - 0.0  0.0  12.09 12.09
          -- LDO Voltage Regulators (small package)
          Chip Package Markings
          1st Line: L271
          2nd Line: G9117

          Code:
           Tab Up, Left to Right
           Pin  1     2    3
             Adjust  Out/Tab  In  Diff(1-2)
           ---------------------------------------
           U2  2.06   3.31   5.12 1.25
           U4  0.00   1.25   3.34 1.25
           U6  6.87   8.13   12.08 1.25
           U7  2.04/2.05 3.29   5.08 1.25 <-- Adj Fluctuated
          -- Voltage Regulators (large package)
          Chip Package Markings
          1st Line: L391
          2nd Line: G1084

          Code:
           Tab Up, Left to Right
           Pin  1   2/Tab   3   Diff(1-2)
           -------------------------------------
           U3  2.09  3.34  5.08  1.25
           U5  2.03  3.28  5.08  1.25
          ---------------------------------------
          Power Board
          --------------------------------------
          -- Voltages at Connectors

          Code:
           Label  Voltage (DC)   
           ------ ------------------
               Pwr Off  Pwr On
           A    0.00   2.62
           B    0.00   3.26
           PSON   0.0571  12.09/12.10 <- Fluctuated
           +5VSB  5.18   5.18
           12V   0.00   12.10
           18V   0.00   18.22
           24V   0.00   23.60
           SGND   0.00   -0.01
           SGND2  0.00   +0.01
           SGND3  0.00   -0.01
          ---------------------------------------
          T-CON Board
          --------------------------------------
          -- Fuses
          Code:
              Pwr Off   Pwr On 
             In  Out  In  Out
          F1 - 0.0  0.0  23.50 23.40 <-- Diff = 0.1
          F2 - 0.0  0.0  23.40 23.40
          -- LED D302 is flashing red 1/sec

          Other information:
          Code:
           Symptom: Back light on, no Image, Video, Menu, etc. 
          
           Using a fresh battery on the DVM, resulted in better readings.
           All VR's Vref = 1.25v
           Main Board Fuse 1: Difference on In/Out with Pwr On = 0.02v
           Main Board U7: Fluctuates on Adjust = 0.01v
           Power Board PSON: Fluctuates = 0.01v
          Thanks in Advance

          NOTE: I used the "CODE" keyword to format the Voltage Data

          Comment

          • jasenpeters
            Senior Member
            • Sep 2015
            • 53
            • USA

            #6
            Re: Vizio - XVT472SV

            Here is the Rear Side of the TV, all boards visible.

            I already included in the earlier post the Main Board, the Power Board and a partial of the TCON board.

            Did you want a specific board?
            Attached Files

            Comment

            • budm
              Badcaps Legend
              • Feb 2010
              • 40746
              • USA

              #7
              Re: Vizio - XVT472SV

              The Voltages are fine now with good running meter so you need to check the Voltage on the SMD fuse of the T-CON board next.

              'T-CON Board : KLS-470WLTD CI(3)' is NOT T-CON board. It is LED driver board: http://www.shopjimmy.com/vizio-6917l...iver-board.htm
              T-CON board is under the metal shield with two cables going to the main board.

              http://www.shopjimmy.com/catalogsear...Vizio+XVT472SV
              Last edited by budm; 09-28-2015, 10:56 PM.
              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

              • jasenpeters
                Senior Member
                • Sep 2015
                • 53
                • USA

                #8
                Re: Vizio - XVT472SV

                Okay, I understand now.
                I'll take a look.

                Thanks for the picture.
                I found it.

                T-CON Board
                Fuse 1 : 0.25 / 0.25 In/Out
                Last edited by jasenpeters; 09-28-2015, 11:06 PM.

                Comment

                • budm
                  Badcaps Legend
                  • Feb 2010
                  • 40746
                  • USA

                  #9
                  Re: Vizio - XVT472SV

                  There is a white SMD fuse on the 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

                  • jasenpeters
                    Senior Member
                    • Sep 2015
                    • 53
                    • USA

                    #10
                    Re: Vizio - XVT472SV

                    It is white with gold ends.

                    Comment

                    • budm
                      Badcaps Legend
                      • Feb 2010
                      • 40746
                      • USA

                      #11
                      Re: Vizio - XVT472SV

                      Yes.
                      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

                      • jasenpeters
                        Senior Member
                        • Sep 2015
                        • 53
                        • USA

                        #12
                        Re: Vizio - XVT472SV

                        Ok, I read the fuse on the T-CON board:


                        T-CON Board
                        Fuse 1 : 0.25v / 0.25v In/Out

                        Any ideas?
                        What about the red flashing LED on the LED Driver board, D302?

                        Comment

                        • budm
                          Badcaps Legend
                          • Feb 2010
                          • 40746
                          • USA

                          #13
                          Re: Vizio - XVT472SV

                          Originally posted by jasenpeters
                          Ok, I read the fuse on the T-CON board:


                          T-CON Board
                          Fuse 1 : 0.25v / 0.25v In/Out

                          Any ideas?
                          What about the red flashing LED on the LED Driver board, D302?
                          The readings are done with the TV turned on? If that is the case then the main board is not supplying the DCV to for the T-CON to function.
                          This is not going to be easy since you will have to trace out which pin is the Voltage supply pin of one of the two connectors that go to the T-CON board fuse, then we need to locate the switched MOSFET that is used as a switch to supply that Voltage to the T-CON.
                          Picture is provided by SHOPJIMMY.
                          Attached Files
                          Last edited by budm; 09-29-2015, 01:59 PM.
                          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

                          • jasenpeters
                            Senior Member
                            • Sep 2015
                            • 53
                            • USA

                            #14
                            Re: Vizio - XVT472SV

                            Yes, power was on. And I too, figured that 0.25v at the fuse would be low.

                            Any suggestions on what device on the main board supplies that DCV and what voltage value should it be?

                            Thanks

                            Comment

                            • budm
                              Badcaps Legend
                              • Feb 2010
                              • 40746
                              • USA

                              #15
                              Re: Vizio - XVT472SV

                              It should have 12VDC to run the T-CON.
                              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

                              • vinceroger69
                                Badcaps Legend
                                • Mar 2012
                                • 6714
                                • uk

                                #16
                                Re: Vizio - XVT472SV

                                on the mainboard picture theres a white connector on the left which has two white fuses it maybe worth checking those to rule them out.

                                Comment

                                • budm
                                  Badcaps Legend
                                  • Feb 2010
                                  • 40746
                                  • USA

                                  #17
                                  Re: Vizio - XVT472SV

                                  Originally posted by vinceroger69
                                  on the mainboard picture theres a white connector on the left which has two white fuses it maybe worth checking those to rule them out.
                                  Those are OK, he already checked them, one is for the 5VSTBY VDC, and another one is for the switched 12VDC, he is getting both Voltages.
                                  Too bad the pictures from SHOPJIMMY is not good enough for me to do the reverse engineering.
                                  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

                                  • vinceroger69
                                    Badcaps Legend
                                    • Mar 2012
                                    • 6714
                                    • uk

                                    #18
                                    Re: Vizio - XVT472SV

                                    Its nice you take the time to actually upload the pictures rather than post a link. As you have probably gathered in the uk we cant click on your links as shopjimmys banned us from seeing them. we have to use a web proxy etc and copying and posting your links dont work, so you taking the time to upload pictures helps us in learning too as we can see what your on about etc and the layout.

                                    Comment

                                    • jasenpeters
                                      Senior Member
                                      • Sep 2015
                                      • 53
                                      • USA

                                      #19
                                      Re: Vizio - XVT472SV

                                      I'm tracing now, will have results soon, stand by.....with pix of course....

                                      Comment

                                      • jasenpeters
                                        Senior Member
                                        • Sep 2015
                                        • 53
                                        • USA

                                        #20
                                        Re: Vizio - XVT472SV

                                        On the T-CON Board:
                                        I traced the F1 Fuse to the CN1 Connector.

                                        From the TOP of the T-CON board the LAND goes from the F1 Fuse to
                                        the first 4 pins of CN1 Connector (See Picture)

                                        These pins correspond to the single (not twisted pair)
                                        wires: Purple, Blue, White, Gray

                                        These wires connect to the Main Board J9 Connector, pins:
                                        2-Blue
                                        4-Purple
                                        6-Gray
                                        8-White

                                        From the TOP of the Main Board the LAND goes from the J9 Connector toward
                                        U1 and U33. However the LAND ends at 4 through holes.
                                        (See Picture)

                                        I researched and find that U1 and U33, both having the same markings:
                                        4953GM <---- 1st Line
                                        938054 <---- 2nd Line

                                        These devices may be:
                                        Duplex P Channel Enhancement Mode Power MOSFET SO-8 Package
                                        (see datasheet attached)

                                        Getting closer
                                        Attached Files

                                        Comment

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