Buzzing noise when turning on the volume.

Have you find out if the problem is with your remote control? For instance, you are able to control your TV using a Universal remote control. My 32" Vizio TV had a similar problem, initially thought it was related to my remote control but in fact the TV didn't respond either to an universal remote control of my SAT receiver that I eventually use to just turn on and off the TV. I've found out that the problem was with a little board on the TV located at the left down corner viewed from the front side of the TV and that receives the signal from the remote control. I found the board on ebay for about $5, replace it and the TV responded again to both original and universal remotes.

you either have a faulty power supply or faulty main board. Vizio power supplies on the older sets are pretty decent. It's usually the main boards that go. These older main boards tend to be pricey so it may be better to buy a new set.

its a bad t-con, or different t-con for new panel

First turn the volume all the up on the box, if that does not fix it you need new speakers.

What you got here is common. The issue is the controller under the volume and channel and power butoons, This is defective!! your going to need to have the tv serviced. this part cost $75-90 bucks the labor may vary in your area. Please do be considerate as you recieved this info FREE when leaving feedback and ratings today.

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It sound like you may have sound processor problem which is part of the main board, I would also look at the 12vdc from power supply to make sure it is clean DC.
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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.

Im having the same problum with my Vizio VW32L
My back light stays on just no picture.. It only turn off if i unplug it.

I need to get a new main board $149

What your tv repair man needs is a Parts & Service manual you can find that here..

http://www.justmanuals.com/advanced_search_result.php?keywords=vizio&osCsid=oi9vp9i6nntk7a6rebllgcsgt3&x=0&y=0

The Manual will have the schematics and block diagrams..

If your repair man needs you to find this info, then maybe you should find a new one?

It's not the speakers. I usually hear of this problem when hooked up to an HD cable box. You can adjust the volume on the cable box and also on the TV. I'll bet you don't have this problem when watching a DVD.

If the problem is what I think it is, your HD Cable box is set at a really low volume while your TV is set to a rather high volume. Try setting the TV volume to around one-third, then set the volume on the cable box until it's as loud as you'd ever want to hear it. With the TV at such a high volume, you're actually amplifying any stray electronic signals that the wires might be picking up, and the above solution will fix that.

Good Luck.