the IF output is pin 16, i have uploaded bigger schematics to imgur.
https://i.imgur.com/NLKBVOx.jpg
Looks like the IF stage has a video out, it's an LA7530N.
https://pdf1.alldatasheet.com/datash...O/LA7530N.html
the only video input is on pin 25 of the LA7601W. but, the video also snakes off to the deflection circuits as well .