The sound of my Vizio sometimes gets louder and then goes back to being soft without touching the volume. This is with Direct TV though. How do I fix it please

sounds like a defective str power regulator ic .......but my advice get a tech to resolder all the pins at the power suppy board area, there may be some open pins that triggers the on and off episodes

I would consult the mfr. to see if it is some known issue---possible causes are some problem with manual volume controls on set itself or a microprocessor problem inside the set.

Worth talking to the company to see if they are aware of this issue.

Either unplug dish from tv or use the antenna side which is HD and program channels and see if volume the same, if not and is OK then it's your Dish bring your sound down or audio cables bad.

Go into menu, sound set-up, and switch SRS to off. It's a vizio thing they came up with to act like "Smart Sound" where commercials won't be louder. It is total BS and does not work, it makes your normal sound fluctuate. Worked on all 3 of my Vizios. Hope it helps you.

I had a similar problem after having a Vizio for 2 and a half years. I left the room for a minute, i came back and the screen went black. I didnt hear an arcing sound though. There was still power to the unit and you could see that the back light was working, just no picture, no sound, and you couldn't use any of the buttons. The only way to turn it off was to unplug it. It would then start up, with the Vizio logo going from orange to white, and then do the same thing all over, no pic or sound. I would check the ceramic fuse first on the board that gets power from the plug.

HOW I FIXED MINE: I ordered a new "main PCB" from tigerdirectparts.com (you can also use searspartsdirect.com). This is the circuit board with all of the inputs on it (hdmi, cable, etc.) I opened it up, disconnected the old one, put in a new one and now it works fine.I used both serial numbers on the board to search for it online. It cost me $144 to do it, but that's better than $450 for a new TV. My tv is the vx32l hdtv10a. I hope that helps.

Most likely a capacitor going bad. If it gets louder after the TV had warmed up for a while, remove the back and blow all the dust off the circuit boards. While you're in there, look for a capacitor (google if you don't know what that is) right next to or touching another component, especially a resistor. Carefully bend it away a little to reduce heat transfer. If it's not a heat-related issue, it'd likely cost more than the TV is worth to have a repair shop fix it. Consider running the audio through a separate sound system. If it buzzes even with the TV volume turned all the way down, disconnect the internal speakers.

Vizio makes an ok LCD, but if you notice they no longer make plasma. they stopped last year. Anyways. the buzzing sound is semi serious, it sounds as though you have a capacitor leaking. It is best to get it fixed before it goes out all the way, with it buzzing it will be easier to identify. Best of luck

In the manual it says switch off leave for 30 seconds and switch back on .

The audio board on your 47" Vizio has gone bad. Replace that board will fix the problem.

I think I had the same problem. This is how I fixed it.

I have my vizio 42 hooked up to a Harmon Kardon surround sound, and the digital cable box. Essentially, I can adjust the volume 3 ways - through the tv, cable box or av receiver. The humming sound happens when you have the volume maxed out on the av receiver and not the cable box.

For example, the sound level on my Harmon Kardon goes from -10 (lowest) to 10 (loudest), with 0 being the middle ground. The buzzing was happening when the Harmon Kardon was set to 10, and I was using the cable box volume to adjust the sound. To fix it, I turned down the volume on my receiver to 0, which may be about 50% max volume of the receiver. Then, I switched devices and used the volume on my cable box. This got rid of the static I was getting. Hope that helps.