Graduated from a Vo-Tech HS, where I majored in electronics. During freshman year, you were exposed to 8 different career fields, 2 per semester, then you declared a major for the next 3 years. In addition to electronics, I learned a bit of carpentry, machine shop, plumbing, HVAC, auto mechanics, auto body, and welding. All useful skills, and certainly helpful in reducing the number of times I have put a car in the shop or call a repairman in to fix something around the house. TV repair was a good chunk of the curriculum, and took up about half of Junior year. We had a couple specially built training sets (one RCA-based, one Zenith-based), where the instructor could induce various problems by means of a lockable "control panel" built into the side of the cabinet. We also fixed a lot of sets for faculty and students, at no charge except parts at cost.
Of course, the school is no longer a Vo-Tech school anymore. Teaching people how to actually build and repair things apparently became obsolete in the "new economy".