I just remembered when I was a kid(Im on my 30’s now) we had this old “box style” television. As it got older, there were times that a white thing will appear on the screen. You can still watch the show but its annoying. Imagine watching your TV while having a white curtain in front of it. One day, I got extremely furious because I was watching Smackdown and slap the side of the TV. Then, it returned to normal. I kept doing the same solution I discovered every time the white thing appears on screen until one day it stopped functioning. 😂
In: Technology
Old technician here:
One thing in particular causes this.
In old CRT tv sets there was a big heavy transformer that created high voltage. It would work at a quite high frequency. It’s this voltage that pulls beam of light put to the sides and up/down.
A TV image is drawn by a beam of light scrolling down over every line. Later on it was drawing every other line then doing it again to create the whole image.
A bit like we do it on modern screens too.
So this high voltage transformer would due to the high frequency sort of shake itself slightly loose.
You could at times hear the coils whine back then.
This could end up with connections in the coils getting loose and your image would either be a line or a dot at the center of the screen.
Giving it a good whack would jolt the connections in place making the image work.
A fix for this would be to take hair spray ( grandma’s big smelly cannister of hair spray) ans give it a good spray at the transformer. This would glue it in place for a while. Often years.
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