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The CRT would be the first thing I'd check as those Zenith CRT's from that time period are some of the worst ones ever made. They will lose emission and/or intermittently short and blow parts in the power supply and/or video output circuit.
Also, there are some driver transistors ahead of the output transistors. These are located on the main chassis. I've seen those fail due to a shorted CRT. You can replace the transistor and it may work for a week; then, the CRT will arc and blow it again.
I used to get these sets with bad CRT's from a local Zenith repair shop when they were only 2 or 3 years old. Sometimes, I'd get lucky and find an older one with a good CRT and take 2 sets and make 1. '90's era Zenith CRT's were bad with '93-'95 being the worst.
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