What is the Y-scan on a TV set?

Seems your tv has a Frame Time Base fault probably due to bad solder joints.
Best take it to a qualified repairer and refrain from turning it on until it is fixed to prevent the fault getting serious.

xyzbird
October 2008

X and Y axis as in drawing a graph.

On a raster TV; where the "spot" flys across row after row to build up the picture, the Y axis circuit determines where the row is positioned in the vertical axis. You've got plenty of action in the X axis because there's a line going across but not much happening in the Y axis.

Y-Scan is the gradual change in height for each successive X-Scan across the screen. - Leastways that's what I learnt in the 1960s...

Peccavi
October 2008