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Vizio m420nv no audio, Eeprom?

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    #1

    Vizio m420nv no audio, Eeprom?

    I got this m420nv. at first the problem was that HDMI 2 input does not work. I plugged in the other hdmi and everything worked fine.

    After just plugging and unplugging each HDMI, now I don't have sound at all anymore... I checked all the other inputs (AVI, antenna, etc) and there all have no sound now!

    I was wondering is it possible that this is an eeprom problem on the main board?
    Tags: None
    #2
    Re: Vizio m420nv no audio, Eeprom?

    Possibly but also check digital audio out settings, try analog audio, make sure TV speaker set on, etc.
    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.

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      #3
      Re: Vizio m420nv no audio, Eeprom?

      What do you mean by analog audio? None of the inputs are giving any audio. Its strange since it was working before but after I plugged into the HDMI 2 input (which doesn't work) I don't have any audio on any input now.
      Last edited by Glitcher; 11-24-2013, 08:36 AM.

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        #4
        Re: Vizio m420nv no audio, Eeprom?

        Any update on this? Did you ever get it solved?

        I ask because I also have a m420nv. Everything was working except the first hdmi slot. Then the second slot went out. Then all the slots went out. I'm not trying to hijack this thread, but I thought our issues could be related.

        Then I bought a new cable to make sure it wasn't my cable, the screen went completely blank, no matter the source. Audio was still working from the antenna, though. I let it sit for many months, and recently turned it on, and now tv(video and audio) from the antenna is working, but the hdmi slots still don't. I've been considering just buying a new logic board for it and hoping that solves it, but I don't want to spend the money, if that's not the issue.

        I haven't yet taken it apart to give it a good examination.

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          #5
          Re: Vizio m420nv no audio, Eeprom?

          Originally posted by Glitcher View Post
          What do you mean by analog audio? None of the inputs are giving any audio. Its strange since it was working before but after I plugged into the HDMI 2 input (which doesn't work) I don't have any audio on any input now.
          It seems like my picture went out sometime after I had tried to plug into the bad hdmi port.

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            #6
            Re: Vizio m420nv no audio, Eeprom?

            Never figured out the problem with it. I bought a new eeprom for the main board but decided not to put it in. I didn't want to risk bricking the somewhat working main board and I end up having to replace the entire board itself for $150...

            Everytime HDMI 2 was plugged in, the picture was never aligned right and also caused all the other inputs to do the same and screw up until the tv was unplugged and reset. I just covered it up and blocked it with tape so it can't be accessed anymore and I ended up just making an amplifier to hook onto separate speakers for like $15 and used as-is.
            Last edited by Glitcher; 01-21-2014, 10:13 AM.

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              #7
              Re: Vizio m420nv no audio, Eeprom?

              It probably makes no difference, but what were you plugging in to the hdmi port? I was plugging in a desktop with an nvidia 650ti.

              It's a little peculiar, because the 650ti recognizes the tv when the tv is set to any hdmi port that the 650ti is not plugged into, but the 650ti loses recognition as soon as the tv is set to the correct hdmi port. These seems to be true of all the ports.

              I currently don't have any other hdmi devices to check with(I don't have the right cables, but they are in the mail). I checked the rgb port on the tv, and it seems to be working. Color is off, but I think that's the fault of the laptop I plugged into it.
              Last edited by fragmentalstew; 01-21-2014, 09:50 PM.

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                #8
                Re: Vizio m420nv no audio, Eeprom?

                I just plugged in a regular cable box with hdmi

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                  #9
                  Re: Vizio m420nv no audio, Eeprom?

                  This problem sounds just like the Vizio SV470M. It is possible it could be a bad CPU. Here is the thread for the discussion about the SV470M

                  https://www.badcaps.net/forum/showthread.php?t=38602

                  What is the part number of the CPU on the main board of the M420NV? Is it MT5392UVSJ
                  Last edited by Shane711; 11-01-2017, 06:20 AM.

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