I'm still struggling a little with this 1077B. I tore my house apart and found the book. I'm looking at the block diagram, I don't get color bars, or any image from the slides on UHF or VHF. Is it right to assume the problem is in the video phase inverter? Or would the Analyst act like a TV with a dead IF and just create a blank screen. In that case it would be in the RF Modulator.
Here is a link to the block diagram.
https://imgur.com/a/gd0JhUV