Vizio e420vse audio problem

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  • freakaftr8
    Badcaps Legend
    • Oct 2012
    • 3743
    • USA
    #1

    Vizio e420vse audio problem

    So I received this TV from a customer who stated they were watching it when the audio went to a really high pitch squealing noise and turning the volume completely down or up had no bearing or effect on the sound. They turned off the TV and turn it back on and it went back to normal. I received the TV to check it out and audio was working fine for the first day of running it, now there is no audio at all either through HDMI or composite input. This uses a tas5717 audio processor/amp. I have not checked voltage is going to the audio processor as of yet. This board is known for failing eprom however all menus work perfect and so does the picture. I'm under the impression that the audio amp has failed however I would like to see if anyone else has encountered this problem before with this model. Main board model is 55.73x01.b01

    Also I should know if it already tried some fire and ice around the board with no results

    Thanks
    Last edited by freakaftr8; 03-02-2017, 11:09 AM.
    Did I leave the soldering iron on?
    Tags: None
    • dick_barton
      Badcaps Legend
      • Aug 2015
      • 6642
      • Wales
      #2
      Re: Vizio e420vse audio problem

      Can you do a factory reset.

      https://www.badcaps.net/forum/showth...ighlight=class
      Willing to help but I'm no expert.

        Comment

        • dskall
          Badcaps Legend
          • Oct 2016
          • 2905
          • usa
          #3
          Re: Vizio e420vse audio problem

          Maybe bad cap feeding the audio power
          I assume no responsibility for any stupid suggestions I might post.

            Comment

            • freakaftr8
              Badcaps Legend
              • Oct 2012
              • 3743
              • USA
              #4
              Re: Vizio e420vse audio problem

              Possibly. I'll investigate further. Haven't tried either as of yet.
              Did I leave the soldering iron on?

                Comment

                • freakaftr8
                  Badcaps Legend
                  • Oct 2012
                  • 3743
                  • USA
                  #5
                  Re: Vizio e420vse audio problem

                  Ok. Audio receives power. Factory reset yielded no results. Checked ohms on speakers. Confident it's the audio processor.
                  Did I leave the soldering iron on?

                    Comment

                    • dick_barton
                      Badcaps Legend
                      • Aug 2015
                      • 6642
                      • Wales
                      #6
                      Re: Vizio e420vse audio problem

                      The audio receives its commands (up/down etc) via the I2C link. Could it be an EEPROM / Firmware issue?
                      Willing to help but I'm no expert.

                        Comment

                        • freakaftr8
                          Badcaps Legend
                          • Oct 2012
                          • 3743
                          • USA
                          #7
                          Re: Vizio e420vse audio problem

                          Not too sure but I show on the two I2C inputs, 3.3v. So obviously it's getting some data and clock information. Also the analog input show voltage as well. However should I be scoping these analog pins instead of testing voltage for frequency changes corresponding to the audio input to the IC?
                          Did I leave the soldering iron on?

                            Comment

                            • dick_barton
                              Badcaps Legend
                              • Aug 2015
                              • 6642
                              • Wales
                              #8
                              Re: Vizio e420vse audio problem

                              The best way is, as you suggest, to scope the lines.

                              There are two supplies to the chip. 3.3V for DVDD, AVDD & HPVDD. Also PVDD_X has a maximum voltage of 30V according to the data sheet.

                              The TAS5717/9 has an over temperature protection system
                              Willing to help but I'm no expert.

                                Comment

                                • freakaftr8
                                  Badcaps Legend
                                  • Oct 2012
                                  • 3743
                                  • USA
                                  #9
                                  Re: Vizio e420vse audio problem

                                  Thanks Dick for that. At my daughter's birthday party going on today but as soon as I'm done I'll check into these voltages and let you know what I find out
                                  Did I leave the soldering iron on?

                                    Comment

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