Broken TV. My TV (an RCA 29" CRT) has stopped scanning and there is now a dazzling horizontal band

Question

My TV (an RCA 29" CRT) has stopped scanning and there is now a dazzling horizontal band of light across the entire width of the screen. Can it be fixed? In the good old days back in BT (Before Transistors) all that was required was to replace the vertical oscillator tube but I don't know which component to check in a newer set.

Thanks,

Doug