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Could be the CRT, however Zenith was known to have intermittent color output transistors that would open up at times. Sounds like your lacking the blue color. The transistors sit in a row with heat sinks mounted on them usually toward the back of the chassis. Usually the transistors are a round job with the heat sink pushed on to them. When I ran into these sets I would put some silicone heat sink compound between the transistor and the heat sink to help them better dissipate the heat. The transistors also plugged into a socket for easy removal.
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