I repaired a few TVs back in the 80s with my father. He worked as an electrical technician so he'd had all the equipment so when one of our TVs died, he'd open it up, find the fault, and fix it. I had smaller hands so I'd be the one who would actually use the multimeter to check the voltage drop across various components. By the time the 90s rolled around there were a lot more custom chips so we haven't done it since then.