Vizio M420NV problems

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  • mcross
    Badcaps Veteran
    • Sep 2011
    • 201
    • USA

    #1

    Vizio M420NV problems

    Ok heres one for you. got this vizio M420NV LED TV.
    powers on to logo screen then off, cycles on and off a few times by its self, then stays on logo screen, but just stays there. can not turn off, remote will not power on or off, button will not ether. have to unplug.
    mike
  • tom66
    EVs Rule
    • Apr 2011
    • 32560
    • UK

    #2
    Re: Vizio M420NV problems

    Corrupt EEPROM/flash chip. Replacement chip I think is about $25.
    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

    • mcross
      Badcaps Veteran
      • Sep 2011
      • 201
      • USA

      #3
      Re: Vizio M420NV problems

      thanks will try that
      Mike

      Comment

      • mcross
        Badcaps Veteran
        • Sep 2011
        • 201
        • USA

        #4
        Re: Vizio M420NV problems

        I found a main board cheap, but has a reversed picture, is that a setting? never seen before
        Mike

        Comment

        • mcross
          Badcaps Veteran
          • Sep 2011
          • 201
          • USA

          #5
          Re: Vizio M420NV problems

          Tom, I had a thought and heated the main board witha heat gun and it came on , went to the menu, ect.. , would you still think eprom?

          Comment

          • attainteddragon
            Badcaps Veteran
            • Apr 2013
            • 764
            • australia

            #6
            Re: Vizio M420NV problems

            i have heard of vizios with a non shut down issue caused by a stuffed voltage regulator on the main! always worth a look!
            WHY CAN'T PHILIPS USE PHILLIPS HEAD SCREWS?

            Comment

            • tom66
              EVs Rule
              • Apr 2011
              • 32560
              • UK

              #7
              Re: Vizio M420NV problems

              Probably not EEPROM then. Processor could have BGA failure, like Xbox 360 RROD.
              Last edited by tom66; 06-06-2013, 03:58 AM.
              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

              • mcross
                Badcaps Veteran
                • Sep 2011
                • 201
                • USA

                #8
                Re: Vizio M420NV problems

                Main board has a regulator u4 1117 reads pin 1 0.00 pin 2 1.00 pin 3 3.10 is that right?

                Comment

                • tom66
                  EVs Rule
                  • Apr 2011
                  • 32560
                  • UK

                  #9
                  Re: Vizio M420NV problems

                  Doesn't seem right. Double check readings, also can you get full part number e.g. AK1117-33.
                  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

                  • johnboy1313
                    Badcaps Legend
                    • Nov 2012
                    • 1959
                    • USA

                    #10
                    Re: Vizio M420NV problems

                    I've read that reflowing the IC (the same one that seems to get the corrupt EEPROM) sometimes fixes these. Maybe you have a cold solder joint somewhere.

                    Comment

                    • mcross
                      Badcaps Veteran
                      • Sep 2011
                      • 201
                      • USA

                      #11
                      Re: Vizio M420NV problems

                      Its good, had my meter on 200v reads pin 1=0.00 pin 2=1.24 pin 3=3.35
                      part number is OFf 1117 no other #s on on it

                      Also did you see my post about the reversed picture ? found a cheap main board but pic is reversed?
                      Last edited by mcross; 06-06-2013, 08:05 AM.

                      Comment

                      • tom66
                        EVs Rule
                        • Apr 2011
                        • 32560
                        • UK

                        #12
                        Re: Vizio M420NV problems

                        Output appears correct then.
                        May be possible to fix reversed picture if you can get into service menu.
                        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

                        • mcross
                          Badcaps Veteran
                          • Sep 2011
                          • 201
                          • USA

                          #13
                          Re: Vizio M420NV problems

                          Tom,
                          Would i need just the regular remote to do that?

                          Comment

                          • tom66
                            EVs Rule
                            • Apr 2011
                            • 32560
                            • UK

                            #14
                            Re: Vizio M420NV problems

                            I don't know if these Vizios even have a service menu....
                            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

                            • richpart
                              Member
                              • May 2012
                              • 42
                              • USA

                              #15
                              Re: Vizio M420NV problems

                              Verify both old and new eeprom numbers are exact match. I used an eeprom for testing once that was close but not exact and it produced a reversed picture.

                              Comment

                              • SgtRock
                                Senior Member
                                • Feb 2012
                                • 175
                                • USA

                                #16
                                Re: Vizio M420NV problems

                                Dear Mcross:

                                --You can get a M420NV Manual here:



                                "Measure twice. Cut once"
                                Norm Abram 1950 -

                                Best Regards
                                Clear Ether

                                Comment

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