Vizio E470i no power

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  • AcGeorgiegirl
    Badcaps Veteran
    • Jun 2013
    • 202
    • USA

    #41
    Re: Vizio E470i no power

    Are the LCD strings generic, or are they proprietary to the model of the tv? I have 3 other Vizio and 2 Samsung tv's that may/may not be repairable(I'm in the process of taking a look at each). It's a shame how often, though, even the same brand and series aren't compatible in swapping stuff out. Panels, I understand, are pretty much never swappable except exact models, right?

    Comment

    • AcGeorgiegirl
      Badcaps Veteran
      • Jun 2013
      • 202
      • USA

      #42
      Re: Vizio E470i no power

      Yes, that's my board.

      Comment

      • AcGeorgiegirl
        Badcaps Veteran
        • Jun 2013
        • 202
        • USA

        #43
        Re: Vizio E470i no power

        Originally posted by newtothis
        Main is irrelevant to this now.

        You have the voltages all coming up yet still no backlight.
        Ok, just to clarify for me....the voltages for everything but the 2 standby's aren't there unless I jumper them...so doesn't this mean there's something up with here, as well?...they aren't getting powered through the correct paths(ie)?

        Comment

        • newtothis
          Badcaps Legend
          • Mar 2013
          • 1556
          • england

          #44
          Re: Vizio E470i no power

          Well there still could be an issue with the mainboard but you should of gotten backlights on from the tests we did indicating an issue.

          Plug your main back into the PSU and try switching it on... Observe the BL_ON and PS_ON voltages to see if they rise or not

          Comment

          • AcGeorgiegirl
            Badcaps Veteran
            • Jun 2013
            • 202
            • USA

            #45
            Re: Vizio E470i no power

            That makes sense.
            Ok. The Ps-on and BL-on are at 3.21 and 3.17v with Main connected and after hitting "on" button. The power does come on, but you wouldn't know(no sounds, glow) and for around 5 seconds I can see the "V" logo on the screen, using a flashlight. I've never been able to see this before. I did replace the small-sized fuse on the board yesterday, because I found that it had no continuity. Maybe that's the difference in getting a picture. Also, the logo stayed as long as that proverbial little blue light was lit. It fades to nothing and so does screen. The v's are present as long as it seems the tv is on, even after the 5 seconds of logo showing using flashlight. I tested by hitting the "on" button, and then get 0 v's again.

            Comment

            • newtothis
              Badcaps Legend
              • Mar 2013
              • 1556
              • england

              #46
              Re: Vizio E470i no power

              It is confirming what we suspect atm.

              Let budm trace the circuits and he will advice you further

              Your main is OK btw

              Comment

              • AcGeorgiegirl
                Badcaps Veteran
                • Jun 2013
                • 202
                • USA

                #47
                Re: Vizio E470i no power

                ...to correct what I last wrote...the logo's fading isn't related to the little blue light fading, as I assumed. I pressed the menu button after the logo gone and blue light gone, and could see the menu on screen with a flashlight. I can now see whatever I put onto the screen with physical buttons(input choices, etc) with the flashlight as long as tv is turned on.

                Comment

                • AcGeorgiegirl
                  Badcaps Veteran
                  • Jun 2013
                  • 202
                  • USA

                  #48
                  Re: Vizio E470i no power

                  Originally posted by newtothis
                  It is confirming what we suspect atm.

                  Let budm trace the circuits and he will advice you further

                  Your main is OK btw
                  You guys are my new best friends

                  Comment

                  • newtothis
                    Badcaps Legend
                    • Mar 2013
                    • 1556
                    • england

                    #49
                    Re: Vizio E470i no power

                    Off topic but are you female? Just your username indicates it

                    Comment

                    • budm
                      Badcaps Legend
                      • Feb 2010
                      • 40746
                      • USA

                      #50
                      Re: Vizio E470i no power

                      So it has two LED driver circuits for two sets of the string, more likely one string for left edge and one string for the right edge of the LCD panel.
                      You need to monitor the Anode of the LED string 1 and string 2 to see what DCV you get when you first turn on the TV, I am looking for the Voltage to jump up high and then settle down to the lower Voltage, I also need to know for sure if you do see the backlights flash on for second or not.
                      BTW, what is the DC Voltage rating of those two filter caps I marked?
                      Pictures provided by SHOPJIMMY.
                      Attached Files
                      Last edited by budm; 05-28-2015, 10:31 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

                      • AcGeorgiegirl
                        Badcaps Veteran
                        • Jun 2013
                        • 202
                        • USA

                        #51
                        Re: Vizio E470i no power

                        Originally posted by newtothis
                        Off topic but are you female? Just your username indicates it
                        Yes.

                        Comment

                        • AcGeorgiegirl
                          Badcaps Veteran
                          • Jun 2013
                          • 202
                          • USA

                          #52
                          Re: Vizio E470i no power

                          Originally posted by budm
                          You need to monitor the Anode of the LED string 1 and string 2 to see what DCV you get when you first turn on the TV
                          Ok, I see where you marked for measuring a LED string, but I'm not sure there's supposed to be two of these...one for each string?
                          Last edited by AcGeorgiegirl; 05-29-2015, 09:27 AM. Reason: More info needed

                          Comment

                          • AcGeorgiegirl
                            Badcaps Veteran
                            • Jun 2013
                            • 202
                            • USA

                            #53
                            Re: Vizio E470i no power

                            I don't "get" strings, I think, is what's tripping me up. Are the 2 circles at the ends of the line you're pointing to the anodes for string 1 and 2?

                            Comment

                            • AcGeorgiegirl
                              Badcaps Veteran
                              • Jun 2013
                              • 202
                              • USA

                              #54
                              Re: Vizio E470i no power

                              ...also, with testing the filter caps, I'm not certain my DMM will give nearly accurate reading unless I desolder/disconnect one lead. Is that true? Mine doesn't read capacitance or ESR...just ac/dc volts, diodes, amps, and ohms.
                              Last edited by AcGeorgiegirl; 05-29-2015, 10:16 AM. Reason: wrong info

                              Comment

                              • budm
                                Badcaps Legend
                                • Feb 2010
                                • 40746
                                • USA

                                #55
                                Re: Vizio E470i no power

                                Originally posted by AcGeorgiegirl
                                Ok, I see where you marked for measuring a LED string, but I'm not sure there's supposed to be two of these...one for each string?
                                I hope you know what the Diode symbol is to be able to tell what is Anode and what is Cathode, please look it up. You will put the meter in DCV, BLACK probe on the chassis, the RED probe on the Anode of the the LED string #1, turn on the TV and observe the readings, then turn off the TV, then do the same on the ANODE of the LED string #2. You see that I drew Diode symbol on the connector that goes to the LED strings of the panel.
                                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

                                • AcGeorgiegirl
                                  Badcaps Veteran
                                  • Jun 2013
                                  • 202
                                  • USA

                                  #56
                                  Re: Vizio E470i no power

                                  Originally posted by budm
                                  I hope you know what the Diode symbol is
                                  I attached a pic with marks I made to show you where I am looking. Yes, the anode side is the part that looks like an arrow. I just don't know where each string's anode is, on the board. I see where you drew the diode symbol for each string, and the only other symbols I see are the ones I circled in blue, which are two that look the same...do I touch the probe to the anodes of each of these? I also circled the area that originally I was focused on, the "Need Verification". I was thinking this was one of the string's area you wanted me to test, but didn't know how to locate the anode portion(!). I am looking for a soldered post that's an anode side of a "string", though not understanding, I think, what a string looks like. Maybe I'm thinking wrongly...that it is similar to a cap's connectors or a resistor's. Sorry I'm so confused!
                                  Attached Files

                                  Comment

                                  • budm
                                    Badcaps Legend
                                    • Feb 2010
                                    • 40746
                                    • USA

                                    #57
                                    Re: Vizio E470i no power

                                    Please see the attached picture.
                                    BTW, you can take the measurement on the top side of the board right at the connector pins.
                                    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

                                    • newtothis
                                      Badcaps Legend
                                      • Mar 2013
                                      • 1556
                                      • england

                                      #58
                                      Re: Vizio E470i no power

                                      ***EDIT***

                                      budm got there while my image was uploading
                                      Attached Files

                                      Comment

                                      • AcGeorgiegirl
                                        Badcaps Veteran
                                        • Jun 2013
                                        • 202
                                        • USA

                                        #59
                                        Re: Vizio E470i no power

                                        Thanks, guys- You were telling me this, but I didn't get it! Quick question...should the psboard be connected to the other boards for this test, or just to the ac?

                                        Comment

                                        • newtothis
                                          Badcaps Legend
                                          • Mar 2013
                                          • 1556
                                          • england

                                          #60
                                          Re: Vizio E470i no power

                                          Plug all boards in when doing the test

                                          Comment

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