Whenever I turn on my TV set it works well for about 10 to 15 min but
after that a thin ray of light appears at the center with a black
background. It stays there for about 1 min or so then disappears. This
intermittent appearance has caused lot of trouble while watching the
TV. What may be the prob. On some days I don't get the line at all.
Mine is 4 years old tv.