Vizio E371VA Power Problem?

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  • Mark355
    Member
    • Apr 2012
    • 24
    • USA

    #21
    Re: Vizio E371VA Power Problem?

    Will do as soon as I'm home from work. The second pic is to find out if that orange cap is the one that could fail without it showing anything physically.

    Thanks for the continued suggestions,

    Mark

    Comment

    • selldoor
      Slow Learner
      • Dec 2010
      • 7870

      #22
      Re: Vizio E371VA Power Problem?

      Something weird going on with pictures- it is there and was there before your post tom
      as I looked at it. - its an ELITE UGGH!! 16v 330uF
      Please upload pictures using attachment function when ask for help on the repair
      http://www.badcaps.net/forum/showthread.php?t=39740

      Comment

      • tom66
        EVs Rule
        • Apr 2011
        • 32560
        • UK

        #23
        Re: Vizio E371VA Power Problem?

        Originally posted by selldoor
        Something weird going on with pictures- it is there and was there before your post tom
        as I looked at it. - its an ELITE UGGH!! 16v 330uF
        Elite caps suck, they are like Capxon... I have too many of them to count in my bad caps bag...
        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

        • Mark355
          Member
          • Apr 2012
          • 24
          • USA

          #24
          Re: Vizio E371VA Power Problem?

          OK folks, the 12's read 12.2, the 5's read 5.3 and the 24's read 24.8. If by chance the Elite is bad, wouldn't it show in these readings? Probably a stupid question, but hey it's my first rodeo!

          Thanks,

          Mark

          Comment

          • Mark355
            Member
            • Apr 2012
            • 24
            • USA

            #25
            Re: Vizio E371VA Power Problem?

            Here's something weird. Sometimes coming from standby, to power on via the power button. I can hear a faint very high pitched whine just before the screen starts to flash on and off. The whine quits after the screen (backlight) starts to flash. Also there is a blue led light on the board on the far left that flashes with the screen. Didn't know if that was any help or not.

            Thanks,

            Mark

            Comment

            • budm
              Badcaps Legend
              • Feb 2010
              • 40746
              • USA

              #26
              Re: Vizio E371VA Power Problem?

              You have correct voltages, but it sounds like you may have problem in the inverter board (bottom left). I would take that out and do some close up inspection and also take good pictures of it.
              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

              • Mark355
                Member
                • Apr 2012
                • 24
                • USA

                #27
                Re: Vizio E371VA Power Problem?

                Thanks Budm, will do when I get home from work.

                Mark

                Comment

                • Mark355
                  Member
                  • Apr 2012
                  • 24
                  • USA

                  #28
                  Re: Vizio E371VA Power Problem?

                  Here are the pics of the inverter board. Nothing looked out of place to me. But if it is the general opinion that this is the culprit, I'm glad to see that this board is only $42.00.

                  Thanks for your suggestions and advise,

                  Mark
                  Attached Files

                  Comment

                  • Mr Bill
                    Badcaps Veteran
                    • Nov 2011
                    • 648
                    • USA

                    #29
                    Re: Vizio E371VA Power Problem?

                    Looking at your inverter board it appears Q1, Q3, Q4, Q5 are MDD1752. If that is the correct number then its a N channel mosfet.

                    One might be shorted out. To check for shorts set your multimeter to ohms and probe the pins per below. (i uploaded a pic of mdd1752 to help identify what each pin is)

                    G-S
                    G-D
                    D-S

                    If anyone of the measurments is under 30 ohms it may be shorted causing the backlight to flicker on and off.

                    EDIT:
                    Also check the transformers for any cold solder joints. Can you post the numbers from the 2 transformers?
                    Attached Files
                    Last edited by Mr Bill; 04-10-2012, 07:52 PM.

                    Comment

                    • Mark355
                      Member
                      • Apr 2012
                      • 24
                      • USA

                      #30
                      Re: Vizio E371VA Power Problem?

                      Thanks Mr. Bill,
                      Here's what I found:

                      All G-S readings were 9.1

                      Q1: D-G = 133.1 D-S = 116.1
                      Q3: Open
                      Q4: D-G = 134.9 D-S = 117.7
                      Q5: Open

                      Transformer No.: L2-EF37-H108228-KD

                      I hope I read everything correctly.

                      Thanks,

                      Mark

                      Comment

                      • budm
                        Badcaps Legend
                        • Feb 2010
                        • 40746
                        • USA

                        #31
                        Re: Vizio E371VA Power Problem?

                        What Ohm scale did you use on the meter?
                        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

                        • Mark355
                          Member
                          • Apr 2012
                          • 24
                          • USA

                          #32
                          Re: Vizio E371VA Power Problem?

                          This scale Budm.......how did I screw it up? lol

                          Thanks,

                          Mark
                          Attached Files

                          Comment

                          • budm
                            Badcaps Legend
                            • Feb 2010
                            • 40746
                            • USA

                            #33
                            Re: Vizio E371VA Power Problem?

                            OK, 200KOhm range, so the MOSFETs are OK.
                            There is one thing you can do is to check the two yellow caps ESR and the capacitance or juts replace them.
                            You may have bad inverter board or bad lamp assembly. So you can take a chance on the caps first or try new inverter 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

                            • Mark355
                              Member
                              • Apr 2012
                              • 24
                              • USA

                              #34
                              Re: Vizio E371VA Power Problem?

                              Thanks Bud. I'll check those caps tonight. What range should they read?

                              Thanks,

                              Mark

                              Comment

                              • selldoor
                                Slow Learner
                                • Dec 2010
                                • 7870

                                #35
                                Re: Vizio E371VA Power Problem?

                                Here is the data sheet for that series. Varying reports on Samyoung.
                                Attached Files
                                Please upload pictures using attachment function when ask for help on the repair
                                http://www.badcaps.net/forum/showthread.php?t=39740

                                Comment

                                • Mark355
                                  Member
                                  • Apr 2012
                                  • 24
                                  • USA

                                  #36
                                  Re: Vizio E371VA Power Problem?

                                  I just ordered the inverter board. I hope that's it! I'll let everyone know the results.

                                  Thanks for the help,

                                  Mark

                                  Comment

                                  • Mark355
                                    Member
                                    • Apr 2012
                                    • 24
                                    • USA

                                    #37
                                    Re: Vizio E371VA Power Problem?

                                    Well, the board arrived today, didn't take long to determine that that didn't fix it.....bummer. Same flashing backlight and dimming of the Vizio logo. Anything else, or is it to the trash?

                                    Thanks,

                                    Mark

                                    Comment

                                    • budm
                                      Badcaps Legend
                                      • Feb 2010
                                      • 40746
                                      • USA

                                      #38
                                      Re: Vizio E371VA Power Problem?

                                      Well, back to drawing 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

                                      • Mark355
                                        Member
                                        • Apr 2012
                                        • 24
                                        • USA

                                        #39
                                        Re: Vizio E371VA Power Problem?

                                        Any suggestions?

                                        Thanks,

                                        Mark

                                        Comment

                                        • budm
                                          Badcaps Legend
                                          • Feb 2010
                                          • 40746
                                          • USA

                                          #40
                                          Re: Vizio E371VA Power Problem?

                                          Not yet, it just does not make sense yet since you do have the 24v for the inverters and PS_ON, BL_ON signals.
                                          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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