RESET:
Unplug the power cord; leave it unplugged for 4 hours or more. When you power it up the internal codes will be reset to the factory defaults.
If the reset does work, then you will need have a Technician diagnose the failure. The cost of the repairs could be anywhere from $75 to $400. Depending on Shop & Parts.
It sounds like the high voltage sector, horizontal deflection or vertical amplifier. But can be a couple of Diodes. If the JVC is a couple of years old, you may want to check on New......sorry
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