a) Exposure to a magnetic source can result in smearing near the edges of the screen. Unshielded speakers or simply switching a vacuum cleaner off near a TV when it's on can create a magnetic field. Sometimes moving the TV when switched on will cause the smearing to appear.
b) Switch the TV off and remove the plug from the mains. After thirty minutes, switch the TV back on. If the TV still has smearing, leave the TV unplugged from the mains overnight. As a last resort talk to you local JVC dealer and inquire about getting a firmware upgrade.
c) Without warranty, prices for firmware upgrades will vary from dealer to dealer.
Hope this helps