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Originally Posted by peverett
This set is new enought that it may have a high voltage shutdown circuit. If the high voltage get high enough to cause X rays from the CRT, the set shuts down.
Problems in the low voltage supply, the high voltage supply or the shutdown circuit itself can cause this. I found a bad electrolytic cap in the low voltage suppy of an early 1980s Zenith that caused this problem.
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Well I suppose that's possible, but the picture doesn't display any anomalies except for the very short shrinkage (black band at the top. and only in the center third of the screen...maybe about 1" tall) which I think is probably more of an adjustment issue. There is a small module not shown in the picture on the right side (as viewed from the back) which has a relay......I had an 80's Zenith console which developed an intermittent shutdown that was due to such a relay going bad....have heard that this is somewhat common for Zeniths that use this arrangement. Then again, it could be a funky circuit breaker or even the on off switch itself.
When I get a chance, will inventory and identify all the module numbers, clean the chassis, reinstall the modules (check and clean the pins as needed) and then attempt to make whatever adjustments I can. I should be easy to spot when I'm done.....I'll be the guy with the Marty Allen hair-do (who remembers him?) Hello Dare!
Anthony