What was the breakdown, and why the blow saved the situation
The reasons are very simple and are related to the peculiarity of the radio equipment of those times. In fact, there were not many of them - only three.
1. Lamp panel
The first Soviet TVs were powered by a lamp. When it failed, it was simply replaced with a new one. To make it easier to change this part, it was not soldered into the circuit, but installed on a special panel - a lamp. This panel was made of special ceramics, and the lamps were fastened with springs.
The desire to reduce the cost of TV production prevailed. Over time, ceramics were replaced by plastic. It is easier to manufacture and much more profitable at a price. They did not take into account only that the plastic from the warmed-up lamp gradually deteriorates. It becomes fragile and begins to crumble. Due to deformation, contact is lost, respectively, the TV will not be shown.
If you hit the body with your fist, the lamp will move slightly, contact appears and the device resumes operation. And so with periodic success. Fortunately, the hulls were strong then.
2. Cold soldering
For a long time, the assembly of TVs was done by hand. All contacts in it were soldered with a soldering iron. To increase production volumes, over time, automatic soldering was launched. Sometimes, in the process, the "legs" of a number of parts were oxidized, so the quality of the soldering suffered. Gradually, the oxidation became more and the contact disappeared. The impact on the body made it possible to displace a bit of the part and resume contact, however, it helped for a short period of time.
3. Microcracks on the board
The tracks on the board were made not from wires, but from very thin strips of foil. They often broke off under mechanical stress. Sometimes, even in these cases, the blow made it possible to renew contact, albeit for a short time. More serious problems always required the intervention of a master.
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In this way, modern technology cannot be returned to work, unless it is completely broken. And in general, in 99 percent of cases, the problem is that the wrong button was pressed. And only about one percent requires real attention from the master.
Continuing the topic, read about Soviet household appliances for the elite, about which ordinary people could only dream.
A source: https://novate.ru/blogs/080321/58112/
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