I'm working on a JVC Model # AV-27020 (dom 9-99). As soon as any signal is applied to it, a black box appears on the lower half of the screen. It looks like the menu background, but when removed through menu controls, it reapears immediately. I have had similar issues with Panasonic TVs in the past and it always ended up beeing a week cap in line, but I have no schematic available to further troubleshoot this JVC. Can you point me in the right direction? Thanks Nick.
Is it the text or closed caption box your talking about? Go into the menu and then the sound options. Go to closed captions and make sure it is set to off. See if this helps. Good Luck, and let us know how you make out with this set.