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Tv have picture only few sec.than dies have sound left only?Yes,than the tv long board call the LCD inverter board is dead.This long LCD inverter board help the LCD screen panel to have a backlight to produced a picture.Tries websites like Shopjimmy.com,Ebay.com to buy this long LCD inverter board for the replacement.
When you say the remote doesn't get the channels I have to assume the channel entry behavior changed. I am not to familiar with this brand but these are the basics for most tv's. If you have not removed the cable input to the tv or unhooked anything before the problem started here are a few thing you could try. Push the menu or setup button on the remote and under the channel or setup option on the tv make sure it is set to Cable and not Air or Antenna. Run the tv through the auto channel search to reprogram the cable channels. This process can take close to 1 hour on some tv's since it has to scan through the digital and analogue tuners. This will allow your tv to add the correct cable channels and remove the unwanted ones. You should be able to enter the channel number or move up and down with the channel buttons on your remote.
This is the best solution for your problem as a 40 year experience with wires etc.
Go to the source of your cable signal connector .
Open it and clean the terminals with emery paper , sand the end of the cable shiny clean from corrosion , get a new barrel connectors with gold terminals if possible lengthen the ends of the cable , insert and tighten good, use thick rg-16 or rg 40 cable with good insulation ends crimped professionally with a crimpier or buy ready made , not from dollar store. Get a gold plated professional splitter if you need one or two , it will cost about 15 or more each . Make the cable runs as short as possible, using the thick good cables. If needed get a signal magnifier. From radio shack or the source etc. Connect them good and tight . Ground the splitters . Problem solved , you will get crystal clear channel 2 to 7 including 3 and 4 . Isolate the TV cable from other cables and power wires.
I've experienced the same problem with my VR-30 and what worked for me was I actually unplugged the power from the TV, waited about twenty seconds and then reconnected and when I turned it back on it worked fine. I've had my tv for about 2 1/2 years and I've had to do this probably a half dozen times so I've gotten used to it. Hope it works for you too.
SVA is a manufacturer based out of China. Their headquarters is based in LA California. They specify in affordable plasmas and LCD's which are typically a generation or so behind other LCD manufacturers or plasma manufacturers.
I have heard of this issue both in the power cord and internal parts of the TV's.
Is it still under warranty?
Otherwise, you can purchase another power cord. Contact the manfuacturer for those small parts.