All of the sudden, our TV screen went dark (but still seemed to be somewhat lit....like a dark blue screen). The TV show was audible, the sound was good, but no picture. The power/standby green light keeps flashing and I cannot change channels or get a picture. Even pressing the channel up and down button on the TV will not work, and the same channel keeps playing, but with no picture, but good sound.
I had a similar problem and it ended up being the bulb. The indicator light never lit up but after i replaced th bulb I checked to see how many hours where on the bulb and it was over 8100. they state the bulbs are only good for 6000. when i replaced it ($140 on ebay) everything was fine.
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Hmmmm! I would have to say you have a problem with the signal board. I have not repaired this brand or model. This would be the first thing to investigate. It is the board that contains all your antenna and rca jacks. Good Luck and visit your TV tech with this info!
What you are discribing is a condition call power supply overcurrent shutdown the TV is going into a protection mode to prevent further circuit damage you really to call in a tech with JVC projection TV repair skills to fix this problem for you