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Frankly, I wouldn't spend much time on it as Zenith quality had really gone down the toilet by this point. If you do decide to fix it, check the CRT because there's a good chance it's weak. These tubes are not nearly as bad as the mid '90's tubes; but, Zenith 27" tubes (probably an A68ACT00X) didn't hold up the best.
As far as the power up problem, look for bad caps in the power supply. There was one Zenith single board chassis set from this era that had a small electrolytic cap under a metal shield, at the right front corner of the chassis. When this cap fails, the set will make sounds like it is trying to start. If you leave it on long enough, it may come to life. I can't remember the value; but, it's under a metal shield.
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