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The fact it shows on tuner and not DVD means not likely a audio problem--check all audio settings in the set's menu AND if you are using a box for signal look there--has to be a setting.
Some JVC sets (brand indicated here) also had issues with when watching the background audio (like a sporting event) was louder than the people talking and could be interpreted as ringing--This is a setting in the set called something like "Theater" or "Hall"
The ITC008 chassis is commonly riddled with poor solder connections. Good soldering station, patience and some good light and magnification and you might be able to fix it... Or you could spend a few dollars and run it into the shop and have a tech do it! It's not an expensive repair.
Try going into the setup menu and make sure the ANT input is set to cable. Then look for Auto Program or Channel Setup and let it scan and find all the channels it can receive. After it's done you should be able to go up and down through the channels.
Yeppers it certanly sounds like the tuner control curcuit or the tuner itself is bad. With the back off the set and the tV on, if you tap on the side of the tuner does the set start to work? if so the tuner has to be replaced
probably just a burned micro fuse on the board
If still under warranty or if you have no electronic repair experience you should take the set back to the shop or to a repair person. Some of the solutions described below can be dangerous, TV's are very hazardous to service. Even when plugged out, TV's can store very high voltages.