Zenith Advanced System 3 picture tube testing

[Zenith26kc20]

Picture in Picture. It was a large rectangular box on the signal (left viewed from the back). Not all sets had them. I don't remember what terminals were jumpered if the module failed (disabling the PIP). If you get it running I'll look it up in my notes. The broken up picture was almost always a small capacitor by the video jungle IC. Intermittant startup/no start was a cap around the heatsink in the middle of the power supply. I liked these chassis. They can produce a great picture.