I appreciate your response. I have looked up the part # for my main unit on my TV with no luck. I have contacted shopjimmy.com for possible compatibility or refurb on the part number. I want to thank you also for alerting me to this site (shopjimmy.com). I have a technical background with plenty of experience, but have difficulty finding parts.That problem was solved.
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Enter the web address below into your browser. This is a schematic of the set. It's not a step by step instruction, but at least you'll know where the board is located and the screws holding it in place.
Sounds like a bad av connection on the main board. i would try to connect the xbox via an alternate av connection or hdmi to verify problem. contact vizio support and describe your problem. they have had trouble with this main board. some of their parts have lifetime warranties and the service call is free. changing out the main board is a pretty simple process, about an hour or less. hope this helps.
I had a similar problem with my Vizio Model VX37L HDTV and replaced the main board myself for $160.00 which I purchased new on Ebay at ShopJimmy.com. The symptoms all of sudden started by the screen going blank except for a rectangular banner across the top that resembled a UPC code only garbled. No sound. I actually had to pull the power cord to turn off the TV. I was able to turn on the set normally but the TV menus did not come up. Since the TV was 19 months old and no extended warranty I checked with Vizio support and Sam's Club but no extended warranty=no luck. I did have an estimate for repair for $900 from a company Vizio recommended but a new one goes for less now. About 42 screws and a half a dozen pin connectors I replaced the main board. The set is working again better than ever. I don't know if I call my self fortunate or not since I did have a problem after only 19 months.