Old Vizio E470VA, new problem

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  • EMD_Driver
    Member
    • Aug 2017
    • 13
    • USA

    #1

    Old Vizio E470VA, new problem

    Hello everyone,

    I did a job for someone and she gave me a Vizio E470VA. She said lightning had struck and the TV no longer worked. Before throwing it away, I decided to test it and see what I could find.

    When the set is plugged in, the word Vizio below the screen lights up. It will then go off again. I can turn the set on with the remote, but I can see the entire screen flashing. It will go light and immediately dark. The flashing is very rhythmic and alternates about every second. I did an extensive search and could find no similar conditions. Also, while the screen is flashing, the Vizio logo below the screen does a very similar type of alternating between light and dim.

    I pulled the PSU and tested it today. I got proper voltage on each of the pins, but they fluctuated a bit. I also noticed a faint clicking around the lower corner of the board. That clicking has the exact same rhythm as the flashing I described before. I'm attaching two pics of the board, in the hopes that someone might be able to help me figure out where the clicking is coming from and whether I should replace the entire board. If I can replace a component, I would rather do that.

    Thanks!
    Gary

    Edit: I also uploaded a pic of the sticker on the board. The center pic is of the corner of the board where the faint clicking is coming from.
    Attached Files
    Last edited by EMD_Driver; 08-22-2017, 02:57 PM.
  • budm
    Badcaps Legend
    • Feb 2010
    • 40746
    • USA

    #2
    Re: Old Vizio E470VA, new problem

    https://www.badcaps.net/forum/attach...2&d=1503435331
    We need to know what the DCV for all those pins of the two white connectors on the left side of the board. Make sure to put down the pin name first and follow by the Voltage reading for each pin, take the two sets of readings: one set when the TV is plugged in another set when the power switch is activated.
    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

    • EMD_Driver
      Member
      • Aug 2017
      • 13
      • USA

      #3
      Re: Old Vizio E470VA, new problem

      I'll be happy to get those measurements for you tomorrow.

      One question..

      Would I get the voltages you need with the PSU out of the set and the PSON jumpered to one of the 5v terminals, or should the readings be taken with everything hooked up?

      Gary

      Comment

      • williej
        Member
        • May 2005
        • 10
        • USA

        #4
        Re: Old Vizio E470VA, new problem

        Test it out of the set,5vsb to pson and read the voltage.
        Last edited by williej; 08-22-2017, 08:20 PM.

        Comment

        • attainteddragon
          Badcaps Veteran
          • Apr 2013
          • 764
          • australia

          #5
          Re: Old Vizio E470VA, new problem

          you need everything hooked up as normal. we need to see if you have command signals.
          WHY CAN'T PHILIPS USE PHILLIPS HEAD SCREWS?

          Comment

          • EMD_Driver
            Member
            • Aug 2017
            • 13
            • USA

            #6
            Re: Old Vizio E470VA, new problem

            I took the measurements both ways. With the PSU installed and on the bench, with the PS_ON jumpered. For the purpose of this post, I flipped the image and cropped it to highlight the connectors.

            The upper connector is labeled: CN903
            I will list the pins and the voltages obtained beside each one, while the board is installed and the power on.

            24v - 24.32-24.34v fluctuating.
            24v - 24.32v
            24v - 24.32v
            24v - 24.32v
            24v - 24.32v
            Gnd
            Gnd
            Gnd
            Gnd
            Gnd
            ENAELE - Unused
            On/Off - 0.11v
            Din - 3.37v

            The lower connector is labeled CN905.
            Same as above.. Board installed, power on.

            On/Off - 0v
            Dim - 0v
            12v - 11.89v
            12v - 11.89v
            Gnd
            Gnd
            Gnd
            24v - 24.32v
            24v - 24.33v
            PS_ON - 4.75v
            5v - 5.2v
            5v - 5.2v

            With the board on the bench, I got the following voltages:

            Connector CN903

            24v - 23.02-24.03v
            24v - 23.61-24.03v
            24v - 23.51-24.06v
            24v - 23.8-24.02v
            24v - 23.4 - 24.03v
            Gnd
            Gnd
            Gnd
            Gnd
            Gnd
            ENAELE - Unused
            On/Off - 0v
            Dim - 0v

            Connector CN905:

            On/off - 0v
            Dim - 0v
            12v - 12.02-12.04v
            12v - 12.02-12.08v
            Gnd
            Gnd
            Gnd
            24v - 23.8-24.09v
            24v - 23.4-24.02v
            PS_ON - 0v
            5v - 5.2v
            5v - 5.2v

            With the board on the bench, the fluctuating voltages corresponded to the clicking heard on the board. Could this be due to the lack of a load? If these voltages all look good, should I suspect the inverter, or the main board next?

            Thanks for the help!
            Gary
            Attached Files

            Comment

            • EMD_Driver
              Member
              • Aug 2017
              • 13
              • USA

              #7
              Re: Old Vizio E470VA, new problem

              I made a little 5 second video of what the TV is doing when powered on. Perhaps this will explain it a bit better than I could.

              Gary
              Attached Files

              Comment

              • budm
                Badcaps Legend
                • Feb 2010
                • 40746
                • USA

                #8
                Re: Old Vizio E470VA, new problem

                On/Off - 0.11v
                Din - 3.37v

                Those two above signals are from the main board, they are fed into one connector and out to another connector to go the Inverter board.
                Right now you do not have ON/OFF (BL-ON) signal from the main board to turn on the backlights circuit. You should verify that DIM signal again because you do have 3.37V on the input connector but not at the output connector that goes to the inverter board. You have problem on the main board some where, you can start by checking the Voltages of the Regulator ICs first.
                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

                • maxvalutech
                  Badcaps Veteran
                  • Dec 2014
                  • 804
                  • australia

                  #9
                  Re: Old Vizio E470VA, new problem

                  I have a couple of sets not same but similar make and note that at turn on the backlights come on bright then dim right down until picture time. Perhaps your set caught in this early bright/dim loop.

                  Comment

                  • EMD_Driver
                    Member
                    • Aug 2017
                    • 13
                    • USA

                    #10
                    Re: Old Vizio E470VA, new problem

                    Originally posted by budm
                    On/Off - 0.11v
                    Din - 3.37v

                    Those two above signals are from the main board, they are fed into one connector and out to another connector to go the Inverter board.
                    Right now you do not have ON/OFF (BL-ON) signal from the main board to turn on the backlights circuit. You should verify that DIM signal again because you do have 3.37V on the input connector but not at the output connector that goes to the inverter board. You have problem on the main board some where, you can start by checking the Voltages of the Regulator ICs first.
                    Thanks for the tip! I'll get those ICs checked and report back!

                    Gary

                    Comment

                    • EMD_Driver
                      Member
                      • Aug 2017
                      • 13
                      • USA

                      #11
                      Re: Old Vizio E470VA, new problem

                      I finally got to test the voltages on the ICs and here's what I got.. I checked each terminal twice, to be sure. I also attached two pictures of the ICs in question. I only found four on the board.

                      U103
                      M271
                      G9084
                      3.80
                      5.04
                      9.57

                      U608
                      17089
                      06 11
                      11.87
                      0.7
                      9.02

                      U704
                      M272
                      1117-18
                      0.8
                      1.794
                      3.301

                      U706M-153
                      1117-33
                      0.8
                      3.3
                      5.14

                      Hopefully, one of you guys will be able to decode all this and help me out.

                      Thanks for looking!
                      Gary
                      Attached Files

                      Comment

                      • Th3_uN1Qu3
                        Believe in
                        • Jul 2010
                        • 6031
                        • Romania

                        #12
                        Re: Old Vizio E470VA, new problem

                        Readings on U704 and U706M look fine. Unsure on the other two, i'm too sleepy and inebriated to look them up, wait for assistance from other members
                        Originally posted by PeteS in CA
                        Remember that by the time consequences of a short-sighted decision are experienced, the idiot who made the bad decision may have already been promoted or moved on to a better job at another company.
                        A working TV? How boring!

                        Comment

                        • EMD_Driver
                          Member
                          • Aug 2017
                          • 13
                          • USA

                          #13
                          Re: Old Vizio E470VA, new problem

                          Guess I didn't hit enter hard enough..

                          U706M-153
                          1117-33
                          0.8
                          3.3
                          5.14

                          Should read:

                          U706
                          M-153
                          1117-33
                          0.8
                          3.3
                          5.14

                          Comment

                          • attainteddragon
                            Badcaps Veteran
                            • Apr 2013
                            • 764
                            • australia

                            #14
                            Re: Old Vizio E470VA, new problem

                            i don't know what u608 is, but all of the other ldo's are good.
                            WHY CAN'T PHILIPS USE PHILLIPS HEAD SCREWS?

                            Comment

                            • EMD_Driver
                              Member
                              • Aug 2017
                              • 13
                              • USA

                              #15
                              Re: Old Vizio E470VA, new problem

                              Originally posted by attainteddragon
                              i don't know what u608 is, but all of the other ldo's are good.

                              Sorry about that..

                              U608 is a 17809

                              Comment

                              • attainteddragon
                                Badcaps Veteran
                                • Apr 2013
                                • 764
                                • australia

                                #16
                                Re: Old Vizio E470VA, new problem

                                found the data sheet, and the output is good.
                                WHY CAN'T PHILIPS USE PHILLIPS HEAD SCREWS?

                                Comment

                                • EMD_Driver
                                  Member
                                  • Aug 2017
                                  • 13
                                  • USA

                                  #17
                                  Re: Old Vizio E470VA, new problem

                                  Originally posted by attainteddragon
                                  found the data sheet, and the output is good.
                                  So if all four mainboard ICs are showing good, where should I look next? What would cause the On/Off of CN903 to read 0.11v?

                                  Thanks,
                                  Gary

                                  Comment

                                  • attainteddragon
                                    Badcaps Veteran
                                    • Apr 2013
                                    • 764
                                    • australia

                                    #18
                                    Re: Old Vizio E470VA, new problem

                                    it could be a bad cap, bad solder joint under the bga processor, or potentially any other surface mounted device.

                                    you know for sure that you have a main board issue, so you can replace it, or you could trace back from the bl/on signal pin and try to find what may of failed. main boards are not easy.
                                    WHY CAN'T PHILIPS USE PHILLIPS HEAD SCREWS?

                                    Comment

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