Join Date: Nov 2006
Location: Under the bridge
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How are you connecting it to your cable system when it does this? Direct coax into the antenna IN jack, or a cable from a box? What is the tv set plugged into? Direct grounded wall socket, or UPS system or ?
The more info you give us, the better chance of a good diagnosis...
It sounds right off like maybe a "hot ground" problem, and the tv shuts down to protect itself.