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I know of the exact thing happening in a Philco-Ford 21" B&W portable in about 1980... It was the Avon lady's set, and she heard what she thought was a car accident in the middle of the night. She didn't find out what happened 'til the next morning!
She called me over to haul it away since she knew I liked to fool with TVs. She didn't want it anymore after that, and she was ready for a color TV anyhow. I couldn't find any reason for the failure. It had just plain imploded! The set wasn't on, and no problems with the chassis. Normally when this happens, it's an exploding electrolytic or a newly installed CRT with some kind of pressure wrongfully applied to the tube (bracket on wrong, etc).
I didn't mention this one in the earlier post since nobody got hurt, and no damage (except for the TV).
Charles
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Collecting & restoring TVs in Los Angeles since age 10
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