Heathkit was the tech school of the time. The kits were sometimes complicated but if you took the time, thought it out ...and built something you learned a lot.
Because of that I learned a lot of skills. Decades ago when money was tight and our tv was on the blink I taught oldest son to test, diagnose and replace parts. Soldering was important too.
We kept a Sharp 19” running way longer than normal.
Last year under warranty I had a tech fix our Sharp 55” Aquos. I had already accessed the hidden tech menus and figured out it was a power supply problem. Tech was very happy replacing the board in less than ten minutes and charging Sharp.
Could have done it myself.