Vizio vt471xvt

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  • techtip
    Member
    • Oct 2013
    • 22
    • Canada
    #1

    Vizio vt471xvt

    Hi Guys, This tv started with no picture sound ok, i found the problem to be in power supply/inverter, replaced module with a used one. picture looked normal after that, put the cover back on, tried the tv again and this is what i get! (see picture) any idea what can cause this??
    Attached Files
    Tags: None
    • newtothis
      Badcaps Legend
      • Mar 2013
      • 1556
      • england
      #2
      Re: Vizio vt471xvt

      Check connections to T-CON

        Comment

        • techtip
          Member
          • Oct 2013
          • 22
          • Canada
          #3
          Re: Vizio vt471xvt

          reseated ribbon cables,cleaned all connectors with contact cleaner,still same problem.
          are there any test points that can be checked?

            Comment

            • newtothis
              Badcaps Legend
              • Mar 2013
              • 1556
              • england
              #4
              Re: Vizio vt471xvt

              Since it was fine until you replaced the back cover I'm wondering if you dislodged the ribbons that enter the driver boards across the LCD panel.. Did you check those?

                Comment

                • techtip
                  Member
                  • Oct 2013
                  • 22
                  • Canada
                  #5
                  Re: Vizio vt471xvt

                  I can see them by looking at the end of the ribbon cables and they seem to be in contact with the sockets? Can the power supply cause something like this,the voltages are dead on also checked for ripple and its ok.

                    Comment

                    • newtothis
                      Badcaps Legend
                      • Mar 2013
                      • 1556
                      • england
                      #6
                      Re: Vizio vt471xvt

                      Possibly.
                      if voltages are OK i wouldn't look that way though.


                      Re seat those cables just in case, seems mighty odd that when you put the back on it started doing it, those cables could of easily been dislodged slightly
                      Last edited by newtothis; 11-20-2013, 06:32 PM.

                        Comment

                        • techtip
                          Member
                          • Oct 2013
                          • 22
                          • Canada
                          #7
                          Re: Vizio vt471xvt

                          Ok i'll try that tomorrow. Thanks

                            Comment

                            • techtip
                              Member
                              • Oct 2013
                              • 22
                              • Canada
                              #8
                              Re: Vizio vt471xvt

                              Ok,Placed wrong screws in wrong holes! That chewed up some of the prints on the panel board. Repaired all prints, Should have been a surgeon! Bu now i believe i have a problem with tcon board. there is a 3a fuse not blown, 11.75v on it there is a regulator not sure probably 3.3v the main ic is running a bit warm,any more input will be greatly appreciated.

                                Comment

                                • newtothis
                                  Badcaps Legend
                                  • Mar 2013
                                  • 1556
                                  • england
                                  #9
                                  Re: Vizio vt471xvt

                                  Before you put the back on was the picture fine?

                                    Comment

                                    • techtip
                                      Member
                                      • Oct 2013
                                      • 22
                                      • Canada
                                      #10
                                      Re: Vizio vt471xvt

                                      Yes, I am thinking that maybe the screws shorted something out when i switched the tv on.

                                        Comment

                                        • newtothis
                                          Badcaps Legend
                                          • Mar 2013
                                          • 1556
                                          • england
                                          #11
                                          Re: Vizio vt471xvt

                                          Ok what board did the screw hit.. T-con?

                                          Take a pic please

                                            Comment

                                            • techtip
                                              Member
                                              • Oct 2013
                                              • 22
                                              • Canada
                                              #12
                                              Re: Vizio vt471xvt

                                              It is the screen driver baords

                                                Comment

                                                • techtip
                                                  Member
                                                  • Oct 2013
                                                  • 22
                                                  • Canada
                                                  #13
                                                  Re: Vizio vt471xvt

                                                  can't upload picture for some reason,will try again later.

                                                    Comment

                                                    • newtothis
                                                      Badcaps Legend
                                                      • Mar 2013
                                                      • 1556
                                                      • england
                                                      #14
                                                      Re: Vizio vt471xvt

                                                      You mean the boards with the tab bonds that go to the panel?!!!!

                                                        Comment

                                                        • techtip
                                                          Member
                                                          • Oct 2013
                                                          • 22
                                                          • Canada
                                                          #15
                                                          Re: Vizio vt471xvt

                                                          Yes.

                                                            Comment

                                                            • newtothis
                                                              Badcaps Legend
                                                              • Mar 2013
                                                              • 1556
                                                              • england
                                                              #16
                                                              Re: Vizio vt471xvt

                                                              Really need to see a picture of the damage, but its my thought that the damage is beyond any repair

                                                              See what Tom thinks too
                                                              Last edited by newtothis; 11-23-2013, 01:41 PM.

                                                                Comment

                                                                • tom66
                                                                  EVs Rule
                                                                  • Apr 2011
                                                                  • 32560
                                                                  • UK
                                                                  #17
                                                                  Re: Vizio vt471xvt

                                                                  Yeah, if you damaged the panel board and you can't fix it... game over sorry.
                                                                  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

                                                                    • techtip
                                                                      Member
                                                                      • Oct 2013
                                                                      • 22
                                                                      • Canada
                                                                      #18
                                                                      Re: Vizio vt471xvt

                                                                      Yes the panel board was damaged,had to jumper a total of 8 traces, did a continuity on all traces and test ok. No components were damaged.

                                                                        Comment

                                                                        • tom66
                                                                          EVs Rule
                                                                          • Apr 2011
                                                                          • 32560
                                                                          • UK
                                                                          #19
                                                                          Re: Vizio vt471xvt

                                                                          OK, so does the fault look different? The same?
                                                                          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

                                                                            • techtip
                                                                              Member
                                                                              • Oct 2013
                                                                              • 22
                                                                              • Canada
                                                                              #20
                                                                              Re: Vizio vt471xvt

                                                                              The fault now looks totally different.If i can get thttps://www.badcaps.net/forum/images/attach/jpg.gifhese pictures to upload!??/
                                                                              Attached Files
                                                                              Last edited by techtip; 11-23-2013, 03:15 PM.

                                                                                Comment

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