Sony CRT TV. Audio OK. If the set is turned on all is normal for a minute
or so. Then the picture is gone and screen fills with uniform illumination
plus about 20 or so fine horizontal lines slightly tilted up on the right.
After a few more seconds the screen gradually gets very bright white and,
wham, the set clicks off by itself. If I turn the set on again it repeats.
Anyone have a clue as to what is wrong?

Alex