Long ago I had a part-time job fixing consumer electronics at a small, independent retail store. Bill, the store's owner, did a big business in TV sets and appliances like washing machines and refrigerators. In those days, TV sets were 100% analog and were failure-prone because of the less sophisticated design and assembly processes of the day, the use of high-voltage at the CRT (picture tube), and the limitations of vacuum tube and semiconductors of the day. So Bill pretty much had to have a "service department" to repair the TV sets that he sold as well as sets that he hadn't sold but that might need repair or (hopefully) replacement with a new set.
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