I had a similar problem a while ago! I checked up some threads around the web and it was when i found out a tip about replacing the inverter board pannels of the backlight!! guess what ? It worked for me... My Vizio HDTV is about 5 years old so far and it is up and running like a champ...!! I hope it works for you!
SOURCE: VIZIO 50" PLASMA
Wow. This is more comon than I thought. My 50" Vizio plasma just went out as will after a loud pop noise. Power button is still lit. Sound continue to come through but no picture. I will dig into it and see if I can find a appropriate solution.
SOURCE: vizio 47" lcd no picture no sound has power
this could be one of two problem. first, check if you have back light. If you do then the problem is with the M/B. Second, if you don't have back light then the inverter is bad and needs to be replace.
SOURCE: Sound but no picture on Vizio WS42L TV
did you ever get it resolve? I am having the same problem. my tv is a year and and 1 week old. I am so upset.
SOURCE: plugged in orange light turno on vizio light is white no picture
possibly is the main board.
SOURCE: I've owned a Vizio VT420M for just over 13 months.
The flickering is most likely due to a faulty fluorescent backlight. Once the bulb heats up the flickering usually goes away. Some bulbs are easier to replace than others so I would contact your local TV repair shop.
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