Vizio VW42L hdtv10a No Picture

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  • pfgallo
    Member
    • Dec 2012
    • 17
    • usa

    #1

    Vizio VW42L hdtv10a No Picture

    Hi All,

    I have read many of the Posts on this Tv problem - cannot find one on what I am seeing or what to test further.

    I gave the Yellow Standby and then White light on with the Front of TV.

    Checked all Cap's nothing looks bad or nothing else sticks out as bad.

    No 12 or 24 V on the Power Supply so looks like not coming on.

    On the Main Board I have on Fuse F2 5.1 volts, on Fuse F1 no voltage at all on either side on this fuse.

    I figure should see something on at least one side if Fuse was Blown.

    So the Question is - Where to look next ?? or link to a post that can help

    Thank you
  • johnboy1313
    Badcaps Legend
    • Nov 2012
    • 1959
    • USA

    #2
    Re: Vizio VW42L hdtv10a No Picture

    Please post good clear pictures of your boards, each connector on the board, and one of the entire assembly. We can't really help if we don't know what you're working on.

    Comment

    • budm
      Badcaps Legend
      • Feb 2010
      • 40746
      • USA

      #3
      Re: Vizio VW42L hdtv10a No Picture

      F1 is fed by the switched 12V from the power supply board, it will be present when the power supply board gets the PS-ON signal to turn on the power supply.
      So you need to report the DCV readings of each pin of the power supply connector that goes to the main board, you MUST put pin name and pin numbers for each reading so will will know what are missing.
      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

      • pfgallo
        Member
        • Dec 2012
        • 17
        • usa

        #4
        Re: Vizio VW42L hdtv10a No Picture

        Here are some pictures

        The Power Board, Main Board and the Two Fuses F1 & F2

        If need more please let me know what your trying to see so can focus on that area.

        Thank you
        Attached Files

        Comment

        • pfgallo
          Member
          • Dec 2012
          • 17
          • usa

          #5
          Re: Vizio VW42L hdtv10a No Picture

          OK Measured from Power Board Connector

          PSON - 3.12v

          12v all -0 v

          SGND - all 0 v

          5v - 5.19 v all three

          A- 1.49 V

          B- 2.89V

          C - 0
          Attached Files
          Last edited by pfgallo; 02-04-2016, 01:27 PM. Reason: Add Picture

          Comment

          • budm
            Badcaps Legend
            • Feb 2010
            • 40746
            • USA

            #6
            Re: Vizio VW42L hdtv10a No Picture

            Originally posted by pfgallo
            OK Measured from Power Board Connector

            PSON - 3.12v

            12v all -0 v

            SGND - all 0 v

            5v - 5.19 v all three

            A- 1.49 V

            B- 2.89V

            C - 0
            OK, so you do have PS-ON, now we need to find out if the PFC Voltage booster is working or not since the 12V/24V power supply require Boosted Voltage to work.
            Check the DCV between the two legs of the main filter cap to see if it has close to 400VDC on that cap. Be careful you will be working in the deadly side of the circuits.
            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

            • pfgallo
              Member
              • Dec 2012
              • 17
              • usa

              #7
              Re: Vizio VW42L hdtv10a No Picture

              Yes - The Very Large Cap on top left has 400 v across it.

              Comment

              • budm
                Badcaps Legend
                • Feb 2010
                • 40746
                • USA

                #8
                Re: Vizio VW42L hdtv10a No Picture

                OK, we need the P/N of the SMD SMPS IC601 so we can look up the spec sheet to find out if it does have VCC to run it.

                Vizio 0500-0507-0450 (DPS-260HP A) Power Supply Unit.
                http://www.shopjimmy.com/vizio-0500-...wer-supply.htm

                Pictures provided by shopjimmy.
                Attached Files
                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

                • pfgallo
                  Member
                  • Dec 2012
                  • 17
                  • usa

                  #9
                  Re: Vizio VW42L hdtv10a No Picture

                  Find IC603 on the board upper top middle and three lower bottom middle.

                  Do not see a IC601.

                  Can you give me a idea where to look?

                  Comment

                  • pfgallo
                    Member
                    • Dec 2012
                    • 17
                    • usa

                    #10
                    Re: Vizio VW42L hdtv10a No Picture

                    Dla001d

                    917y736
                    Attached Files

                    Comment

                    • budm
                      Badcaps Legend
                      • Feb 2010
                      • 40746
                      • USA

                      #11
                      Re: Vizio VW42L hdtv10a No Picture

                      http://www.datasheetcafe.com/dla001d...controller-st/

                      Check the Voltage between pin 10 gnd and pin 12.
                      Attached Files
                      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

                      • pfgallo
                        Member
                        • Dec 2012
                        • 17
                        • usa

                        #12
                        Re: Vizio VW42L hdtv10a No Picture

                        To do this I need the board to be removed from Frame and hanging free.

                        To get to the back IC

                        Is this OK to do powered up?? Board not grounded then to frame

                        Also the picture I sent of the IC which Letters are those pins near.

                        Want to make sure I measure correct ones

                        Thanks

                        Comment

                        • budm
                          Badcaps Legend
                          • Feb 2010
                          • 40746
                          • USA

                          #13
                          Re: Vizio VW42L hdtv10a No Picture

                          You can solder two wires to the pads and connect the wire to the dcV meter, you should leave the board mounting in place and you will need to have the main board connected to the power supply board.
                          Or you can use 470~1K resistor 1/4W (or larger does not matter) resistor between 5VSTBY and the PS-ON pin to force on the power supply so you can test the board by itself without having other boards connected to it and without mounting the board to the chassis.
                          You will be making the measurement in the HOT side so do not touch anything with your hands or body.
                          Attached Files
                          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

                          • pfgallo
                            Member
                            • Dec 2012
                            • 17
                            • usa

                            #14
                            Re: Vizio VW42L hdtv10a No Picture

                            Ok

                            Your saying I connect wires to pin 10 and 12 and remount board with wires out back so can measure them.

                            For the ground can I touch any ground point or has to be the one you marked so then would need three wires out back

                            Comment

                            • pfgallo
                              Member
                              • Dec 2012
                              • 17
                              • usa

                              #15
                              Re: Vizio VW42L hdtv10a No Picture

                              Looking at the IC its going to be hard to solder wires to it being so small

                              I got a 1 k Resistor and can do the second one.

                              So what is exactly you want me to do.

                              Connect resistor between 5VSTBY and the PS-ON pin and then ??

                              Comment

                              • budm
                                Badcaps Legend
                                • Feb 2010
                                • 40746
                                • USA

                                #16
                                Re: Vizio VW42L hdtv10a No Picture

                                Originally posted by pfgallo
                                Ok

                                Your saying I connect wires to pin 10 and 12 and remount board with wires out back so can measure them.

                                For the ground can I touch any ground point or has to be the one you marked so then would need three wires out back
                                Pin 10 is the GND pin for your black probe, pin 12 is the VCC for your Red probe.
                                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

                                • pfgallo
                                  Member
                                  • Dec 2012
                                  • 17
                                  • usa

                                  #17
                                  Re: Vizio VW42L hdtv10a No Picture

                                  Hi

                                  Maybe did not read my last message ---

                                  Looking at the IC its going to be hard to solder wires to it being so small

                                  I got a 1 k Resistor and can do the second one point you said.

                                  So what is exactly you want me to do.

                                  Connect resistor between 5VSTBY and the PS-ON pin and then ??

                                  Comment

                                  • budm
                                    Badcaps Legend
                                    • Feb 2010
                                    • 40746
                                    • USA

                                    #18
                                    Re: Vizio VW42L hdtv10a No Picture

                                    Originally posted by pfgallo
                                    Hi

                                    Maybe did not read my last message ---

                                    Looking at the IC its going to be hard to solder wires to it being so small

                                    I got a 1 k Resistor and can do the second one point you said.

                                    So what is exactly you want me to do.

                                    Connect resistor between 5VSTBY and the PS-ON pin and then ??
                                    If it is hard for you to solder the wires so you can check the DCV between pin 10 and pin 12 then what else do you think you can do to accomplish that.
                                    Once you install the resistor to simulate the PS-ON signal (so you can run the board by itself without having it connected to other board) then you apply AC power to the board and see what DCV you have between pin 10 and pin 12 of the IC for it to work.
                                    Or instead of wasting time you can buy a replacement 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

                                    • pfgallo
                                      Member
                                      • Dec 2012
                                      • 17
                                      • usa

                                      #19
                                      Re: Vizio VW42L hdtv10a No Picture

                                      Hi

                                      I replaced the Power Supply Board and still did come on.

                                      So today replaced the Main Board and again still does not come on.

                                      Anyone any ideas??

                                      Thank you

                                      Comment

                                      • budm
                                        Badcaps Legend
                                        • Feb 2010
                                        • 40746
                                        • USA

                                        #20
                                        Re: Vizio VW42L hdtv10a No Picture

                                        Recheck and see if all the DCV and the command signals are present from the new boards.
                                        i hope you bought the boards from good seller.
                                        Last edited by budm; 02-12-2016, 03:49 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

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