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That's overscan, and is how all older sets were designed. Edge and corner accuracy was inconsistent until mid/late 80's so this let them hide the distortion. Lower end sets used it longer. If it's only 10yrs old you can probably adjust it. Try every menu, every knob, every button. You may see openings in back to small slotted POTs. If you try those, use an insulated screwdriver and don't touch the metal, and don't turn much without checking the screen or you may find the picture has become My Favorite Martian 24/7.
/late-night, caution-to-the-wind response.
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There are a vast number of people who are uninformed and heavily propagandized, but fundamentally decent. The propaganda that inundates them is effective when unchallenged, but much of it goes only skin deep. If they can be brought to raise questions and apply their decent instincts and basic intelligence, many people quickly escape the confines of the doctrinal system and are willing to do something to help others who are really suffering and oppressed." -Manufacturing Consent: Noam Chomsky and the Media, p. 195
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