My question How did smacking electron tube TVs help? should not be on hold because it appears to be off-topic (imho of course).
"Questions on the use of electronic devices are off-topic as this site is intended specifically for questions on electronics design."
I didn't ask anything about the usage of a electronic device. It's not relevant whether that smacking occurs by hand on a TV or something else. Every electronic design pattern with these characteristics can be (more or less) "fixed" with this kind of impact. It doesn't matter which end-consumer product this pattern is built into.