I have a JVC television model# AV- 27D800 w/Guide plus. I can no longer get sound or any image other than a blue screen on the main tuner. When I turn the set on I get it for about 1second, then blue screen. I can still view and listen to the channels on the PIP and Guide Plus features. I have Comcast cable and in trying to troubleshoot with them I received the same instructions as in the pamphlet for reset of the reception. Now I only get channel two. I can still view DVDs or videos on the main tuner screen. Can you help??? Bruce

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