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Vizio XVT473SV: Need help with part number U33

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    #1

    Vizio XVT473SV: Need help with part number U33

    My TV has the no video/image but powers on. I understand the common problem is the U33 conductor on the main board, after reading this in may other forum posts. I ordered the U33 part from Digi-keys (Mfg P/N LD1117ASTR; Description IC REG LDO POS 1A ADJ); however this appears to be a different type of voltage regulator as the one I removed from the board is 8 pins, while the replacement from Digi-keys is 4 (3 on one side and 1 big pin on the other).

    Does someone know the U33 part number on the Vizio 47 inch XVT473SV?
    Tags: None
    #2
    Re: Vizio XVT473SV: Need help with part number U33

    U33 on one main board of different model of the TV will not be the same U33 as used in your TV.
    Do you have backlights. What DCV do you get on the connector of the power supply board that goes to the main board, and what DCV do you get on the command signals PS-ON, BL-ON, DIM?
    You need to do basic Voltages check first.
    Last edited by budm; 09-26-2015, 06:15 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

      #3
      Re: Vizio XVT473SV: Need help with part number U33

      No backlight, but I am a newbie at this and was hoping for a quick fix that even a novice with limited knowledge can fix. Thanks for the reply but that is way out of my skill set.

      Looks like i will need a new tv as there is no way to ensure that buying a new main board is the problem.

      Appreciate your response.

      Comment

        #4
        Re: Vizio XVT473SV: Need help with part number U33

        http://www.ernestos-electronics.com/...rmware-update/

        a known Common failure for this main board is firmware GOING BAD.

        datasheet for U33

        https://cdn.badcaps-static.com/pdfs/...2949d76ef2.pdf
        Last edited by ecking767; 09-27-2015, 09:32 AM.

        Comment

          #5
          Re: Vizio XVT473SV: Need help with part number U33

          Thanks for the info on the U33 chip; I have nothing to lose so will give this a shot. That replacement main board would have been great if I didn't already remove the original U33 chip from the board.

          We tried to make out the original writting on the chip, but the solder did make it hard to see (i was able to make out M461).

          Comment

            #6
            Re: Vizio XVT473SV: Need help with part number U33

            I can't find the G5692 for sale anywhere online. Anyone have any ideas of where to obtain this chip (U33)?

            Comment

              #7
              Re: Vizio XVT473SV: Need help with part number U33

              U33 doesn't control the back light on this main board. re-solder the U33 chip back on to the board

              Comment

                #8
                Re: Vizio XVT473SV: Need help with part number U33

                I no longer have the old chip, as one of the pins broke off during removal. If I can't buy a replacement U33, then I am afraid I need to scrap the TV as I am not sure if it's worth replacing the main board ($130) when I am not 100% certain that it is the issue

                Comment

                  #9
                  Re: Vizio XVT473SV: Need help with part number U33

                  Originally posted by rsmith1545 View Post
                  I no longer have the old chip, as one of the pins broke off during removal. If I can't buy a replacement U33, then I am afraid I need to scrap the TV as I am not sure if it's worth replacing the main board ($130) when I am not 100% certain that it is the issue
                  its a 240Hz LED hdtv with a nice picture. there are other sellers who have this board at a cheaper price.

                  http://www.ernestos-electronics.com/...sv-main-board/

                  Comment

                    #10
                    Re: Vizio XVT473SV: Need help with part number U33

                    Originally posted by ecking767 View Post
                    there are other sellers who have this board at a cheaper price.

                    http://www.ernestos-electronics.com/...sv-main-board/
                    @ecking767, are you the owner and seller of the above website and product? The about us page

                    http://www.ernestos-electronics.com/...s-electronics/

                    suggests so. If yes, you should disclose that you are selling the product clearly to potential buyers.
                    --- begin sig file ---

                    If you are new to this forum, we can help a lot more if you please post clear focused pictures (max resolution 2000x2000 and 2MB) of your boards using the manage attachments button so they are hosted here. Information and picture clarity compositions should look like this post.

                    We respectfully ask that you make some time and effort to read some of the guides available for basic troubleshooting. After you have read through them, then ask clarification questions or report your findings.

                    Please do not post inline and offsite as they slow down the loading of pages.

                    --- end sig file ---

                    Comment

                      #11
                      Re: Vizio XVT473SV: Need help with part number U33

                      Originally posted by retiredcaps View Post
                      @ecking767, are you the owner and seller of the above website and product? The about us page

                      http://www.ernestos-electronics.com/...s-electronics/

                      suggests so. If yes, you should disclose that you are selling the product clearly to potential buyers.
                      OKAY I will do that.

                      Comment

                        #12
                        Re: Vizio XVT473SV: Need help with part number U33

                        No picture on the LCD screen could also be the PC board (T-CON).

                        you can check each fuse on that board for voltages. You will need a multi-meter.

                        Make sure there is voltages on both end of each fuses. F4 should be +5volts and F1 should be +12 volts
                        Attached Files
                        Last edited by ecking767; 09-30-2015, 11:02 AM.

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