I know this sounds off-topic but it might not be... I have a Sony 52" rear projection tv... if your unit that you speak of is rear projection large screen then maybe its what sony calls the D board... mine fried from running an air conditioner. the surge from the AC fried a chip on the D board. All the set did was flash the ON/STANDBY light and sometimes there was sound and sometimes not. A relative in the repair industry repaired it for cost of parts alone and it was just over $90 cad. for the one IC that fried. Maybe JVC has the same type of over-sensitive circuitry?

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