Vizio XVT473SV: Need help with part number U33

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  • rsmith1545
    New Member
    • Sep 2015
    • 6
    • USA
    #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
    • budm
      Badcaps Legend
      • Feb 2010
      • 40746
      • USA
      #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

        • rsmith1545
          New Member
          • Sep 2015
          • 6
          • USA
          #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

            • ecking767
              Badcaps Veteran
              • Oct 2009
              • 492
              • USA
              #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

                • rsmith1545
                  New Member
                  • Sep 2015
                  • 6
                  • USA
                  #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

                    • rsmith1545
                      New Member
                      • Sep 2015
                      • 6
                      • USA
                      #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

                        • ecking767
                          Badcaps Veteran
                          • Oct 2009
                          • 492
                          • USA
                          #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

                            • rsmith1545
                              New Member
                              • Sep 2015
                              • 6
                              • USA
                              #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

                                • ecking767
                                  Badcaps Veteran
                                  • Oct 2009
                                  • 492
                                  • USA
                                  #9
                                  Re: Vizio XVT473SV: Need help with part number U33

                                  Originally posted by rsmith1545
                                  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

                                    • retiredcaps
                                      Badcaps Legend
                                      • Apr 2010
                                      • 9271
                                      #10
                                      Re: Vizio XVT473SV: Need help with part number U33

                                      Originally posted by ecking767
                                      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

                                        • ecking767
                                          Badcaps Veteran
                                          • Oct 2009
                                          • 492
                                          • USA
                                          #11
                                          Re: Vizio XVT473SV: Need help with part number U33

                                          Originally posted by retiredcaps
                                          @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

                                            • ecking767
                                              Badcaps Veteran
                                              • Oct 2009
                                              • 492
                                              • USA
                                              #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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