This sounds more like a power supply or other board in the TV. Dangerous and lethal voltages are inside so get repair estimates. At 10 years, folk may replace such a set.
More at http://www.shopjimmy.com/tv-repair-tips
Hi, I have a 10 year old Pioneer Kuro Plasma TV hooked up to a 2 month old Yamaha surround stereo receiver. I also have Verizon Fios cable and a blu-ray player hooked in through the receiver, along with 5 Paradigm speakers and a subwoofer. While watching cable the TV at times will intermittently flash the picture on an off for a period of minutes, while keeping sound the entire time. It also will click loudly and sometimes show a snowy screen with no sound. It doesn't happen all of the time but it happens enough to annoy me and even unplugging everything doesn't always fix it. We've called Verizon and they told us to replace the HDMI cable from the cable box to the receiver and we did that. That did not solve the problem. It doesn't happen when we watch the blu-ray though (although we sometimes still hear that click). I really think it's the cable box, but should I replace more HDMI cables?

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