Needing confirmation Vizio E701i-A3

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  • sbeck
    Member
    • Mar 2013
    • 31
    • USA

    #1

    Needing confirmation Vizio E701i-A3

    Working on this for a friend.

    Tv will power up, LED backlight will flash on for a tenth of a second then stay off, if I shine a flashlight in the front of the panel the display is working, just no back light.

    I have tested power going from the power supply to the LEDs, but it is there only for that flash, then voltmeter reads zero.

    I theorize this means something on the power supply board has gone bad. Just looking for confirmation from some one who knows a little more.

    Thanks S
  • tom66
    EVs Rule
    • Apr 2011
    • 32560
    • UK

    #2
    Re: Needing confirmation Vizio E701i-A3

    There's probably a signal like BLON or LED_ON, check this. If this signal is disappearing when the LEDs go out, I'd look at the main board. But if it stays on then I'd look at the power supply.
    Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
    For service manual, schematic, boardview (board view), datasheet, cad - use our search.

    Comment

    • sbeck
      Member
      • Mar 2013
      • 31
      • USA

      #3
      Re: Needing confirmation Vizio E701i-A3

      Thanks tom66,

      I tested LEDON coming from main board to power supply, and have 3.3VDC, But still nothing on the LED+ going from power supply to LEDs.

      It seems no parts stores, online or otherwise, that I have contacted can get this board, how would I go about diagnosing the components of the board, is there a starting spot? Or do you have another option for a replacement? The number on the board is 1p-1129800-1011.

      Thanks again for the confirmation.

      S

      Comment

      • martyparish
        Badcaps Veteran
        • Dec 2012
        • 313
        • United States

        #4
        Re: Needing confirmation Vizio E701i-A3

        You may be able to repair the PSU. Please post clear high resolution photos of the PSU for starters. A shot of the whole chassis would be great too.

        Comment

        • sbeck
          Member
          • Mar 2013
          • 31
          • USA

          #5
          Re: Needing confirmation Vizio E701i-A3

          Thanks,
          The TV is so big, its hard to get the whole chasis in there, but if you need better, let me know. Also the Power supply board is large too, so if you need a better spot on it, let me know.

          S
          Attached Files

          Comment

          • ecking767
            Badcaps Veteran
            • Oct 2009
            • 492
            • USA

            #6
            Re: Needing confirmation Vizio E701i-A3

            Originally posted by sbeck
            Thanks,
            The TV is so big, its hard to get the whole chasis in there, but if you need better, let me know. Also the Power supply board is large too, so if you need a better spot on it, let me know.

            S
            good pictures
            Last edited by ecking767; 03-05-2013, 11:52 AM.

            Comment

            • martyparish
              Badcaps Veteran
              • Dec 2012
              • 313
              • United States

              #7
              Re: Needing confirmation Vizio E701i-A3

              Pics look good! To get more info, please test all pins on the same connector with LEDON and list all results.

              eg.

              T CON_ON: 3.3v
              12v T CON: 12.2v
              etc...

              Comment

              • sbeck
                Member
                • Mar 2013
                • 31
                • USA

                #8
                Re: Needing confirmation Vizio E701i-A3

                Top to bottom Tested to chassis ground
                tcon_on: 3.25
                12V T Con: 12.52
                -
                LED-BR: 2.72
                LED ON: 3.33
                BL ERR:-
                12V reg: 12.52
                12V reg: 12.52
                -
                -
                -
                12V Audio: 12.52
                PS ON: 3.33
                AC-DET: 3.49
                3.3V: 3.36

                Comment

                • tom66
                  EVs Rule
                  • Apr 2011
                  • 32560
                  • UK

                  #9
                  Re: Needing confirmation Vizio E701i-A3

                  And here I thought this was a 17", not a 70"! Blimey... that's very little for a 70" TV... I'm guessing it uses a Sharp panel, as Sharp are currently leading the field in big screen TV (especially LED backlit.)
                  Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                  For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                  Comment

                  • sbeck
                    Member
                    • Mar 2013
                    • 31
                    • USA

                    #10
                    Re: Needing confirmation Vizio E701i-A3

                    yes, it does have a sharp panel

                    Comment

                    • tom66
                      EVs Rule
                      • Apr 2011
                      • 32560
                      • UK

                      #11
                      Re: Needing confirmation Vizio E701i-A3

                      So, when it fires up, what do you measure across LED1+ and LED1-? No probe should be on the chassis.
                      Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                      For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                      Comment

                      • sbeck
                        Member
                        • Mar 2013
                        • 31
                        • USA

                        #12
                        Re: Needing confirmation Vizio E701i-A3

                        12V for a flash. I am using a digital meter, and it takes a bit for it to register, so I don't know exact.

                        Comment

                        • tom66
                          EVs Rule
                          • Apr 2011
                          • 32560
                          • UK

                          #13
                          Re: Needing confirmation Vizio E701i-A3

                          12V is far too low -- I'd expect hundreds of volts.
                          Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                          For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                          Comment

                          • sbeck
                            Member
                            • Mar 2013
                            • 31
                            • USA

                            #14
                            Re: Needing confirmation Vizio E701i-A3

                            Originally posted by tom66
                            12V is far too low -- I'd expect hundreds of volts.
                            It certainly could be, like I said it is there and just as quick it is gone.The LED's do flash on fully for that split second as well

                            Comment

                            • tom66
                              EVs Rule
                              • Apr 2011
                              • 32560
                              • UK

                              #15
                              Re: Needing confirmation Vizio E701i-A3

                              The LED ON signal is on continuously?
                              Can you remove the power board and get a picture of the underside?
                              Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                              For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                              Comment

                              • sbeck
                                Member
                                • Mar 2013
                                • 31
                                • USA

                                #16
                                Re: Needing confirmation Vizio E701i-A3

                                Yes while the set is on it has the 3 volts on LED_on

                                In the pictures, top is still top I have flipped it left to right
                                Attached Files

                                Comment

                                • budm
                                  Badcaps Legend
                                  • Feb 2010
                                  • 40746
                                  • USA

                                  #17
                                  Re: Needing confirmation Vizio E701i-A3

                                  From looking at the outputs that go to the LEDS, it looks like it will not be steady DC but pulsing DC output at high frequency with pulse width modulation. So if you use DC meter to read those outputs, it will not show correct DC voltge.
                                  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

                                  • sbeck
                                    Member
                                    • Mar 2013
                                    • 31
                                    • USA

                                    #18
                                    Re: Needing confirmation Vizio E701i-A3

                                    What do I need to do to get you what you need?

                                    Comment

                                    • budm
                                      Badcaps Legend
                                      • Feb 2010
                                      • 40746
                                      • USA

                                      #19
                                      Re: Needing confirmation Vizio E701i-A3

                                      Can you check the resistance between the backlights LED connectors' pins (unplug the connectors from the power supply board) and the chassis ground to see if it shows any reading?
                                      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

                                      • sbeck
                                        Member
                                        • Mar 2013
                                        • 31
                                        • USA

                                        #20
                                        Re: Needing confirmation Vizio E701i-A3

                                        It all shows infinite ohms between each other as well as each pin to chassis ground

                                        Comment

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