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sound problem is your input menu or your cables r plugged into wrong ports.push input ,go to s video ,component hdmi,or av 1 or 2 make sure,if your tv hasside av inputs,you plug your coverter box(direct tv etc.) into the side inputs,then use remote
If no power from external inputs,then most likely its an av axial capacitor only it will be grey and look like more like a relay
Your TV has two sets of AV inputs. One on the side and one at the back. The Wii has a 3RCA cable ( Yellow / Red & White ) . Connect these jacks to the corresponding color sockets on the side input of your TV. Select that input on the TV and your Wii sound and picture should come on. For the DVD player you have to get a 5 RCA component cable. This cable will have 5 colored jacks, connect the White & Red to the Audio in of the TV and then connect the Red/Blue/Green jacks to the component video input of the TV.Do the same at the DVD's end also. Setect that source on the TV and you should hear the DVD sound and picture.
Is it connected with HDMI? or Component, or AV cables? If HDMI, is it connected to an AV receiver? if so, disconnect from the AV receiver and connect straight to cable box. You may also try connecting component cables if you have them HDMI is still quirky depending on your receiver, cable box etc. Lots of veriables.
Check that first, if you still have an issue, post a comment with all makes and models of products connected and I can help further.
Call your cable company as there might be a problem with the drop line or aerial coming into your house. now another thing is if you have a signal splitter( ex: 2-way, 3-way, 4-way) before the cable box, that could be degrading the signal as each input may drop the signal significantly. remeber, don't use too many splitters as they will make the signal faded/fuzzy. also, make sure all the connectors are clean and are not badly bent or the ends frayed. If you can see wire insulation from the cable line then it's no good.
The video may be plugged into input 1 and the audio into input 2. This could be a million different things.
If using Component video (green, blue, red, RCA cables) check to be sure the Green cable is set all the way on both sides. The green cable sends the sync and without it you will have NO picture.
The 37" Vizio I just bought has a very confusing feature where the same input can be used as either the Y channel of the component or the full video channel for composite. If you plug a component source into the TV and then select the composite input ("AV" on the remote), you will see a black and white version of the full component signal (makes sense as the Y channel is just the luminance component). As sad as it is, I was stumped by this for a while until I happened to hit "COMP" and got full color. FWIW, the manual warns about this, but it really doesn't emphasize the point. I wonder how many returns they get because of this.
Criminy! This is amongst it's several fatal flaws. I strongly suggest that you RUN, DO NOT WALK-- back to where you purchased it, and get your money back. Then, coffee in hand, sift through a few "Consumer Report" type ezines & find a better model to own!