I tried the jvc codes 3 times, checking thoroughly that all the right lights flashed, but no success. I tried two channel-up methods, but also no success. Method 1: press tv and tivo power until red light stays on. Red light never stayed on. Method 2: tv and clear and code 0999. First time I press channel up it turns the tv off, but not on again.
I wanted to pop by and see how things are today? If you've had no luck as of yet with getting the volume control working, it may be that the codes we have aren't compatible. New codes come out all the time and we don't always have the latest ones.
If you contact the manufacturer of the TV you bought they can help you find the correct code.