use the Horizontal deflection circuit to also drive the CRT EHT generator,which ,hence became known as a "flyback" supply.
In this Flow chart:
http://en.wikipedia.org/wiki/Analog_television#mediaviewer/File:TV-block-diagram.svg
It only uses the Horizontal blanking signal for the flyback, they don't use the vertical blanking signal for flyback only the horizontal blanking signal
The Flyback circuit is not a power supply, it's just an high voltage AC transformer it says
In this Flow chart:
http://en.wikipedia.org/wiki/Analog_television#mediaviewer/File:TV-block-diagram.svg
It only uses the Horizontal blanking signal for the flyback, they don't use the vertical blanking signal for flyback only the horizontal blanking signal
The Flyback circuit is not a power supply, it's just an high voltage AC transformer it says