Hi, I have a JVC model AV-21ME the shuts down on it's own. When it shuts down there is a horizontal line across the tube and the timer light on the TV flashes. The only way to get it to power back up is to push the power button on the TV the use the remote or push a channel button on the TV to turn it on. When it does come on it is on only for a few seconds, it shuts down and the timer light comes on again. The TV was working fine up to the point that it started to shut down on its own. Any assistance as to what the problem might be would be appreciated.

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