Answer by taking a quote from the following article:

Les Paul was born Lester William Polsfuss in Waukesha, Wisconsin, to George and Evelyn (Stutz) Polsfuss. His family was of German ancestry. Paul's mother was related to the founders of Milwaukee's Valentin Blatz Brewing Company and the makers of the Stutz automobile. His parents divorced when he was a child.

Paul had hosted a 15-minute radio program, The Les Paul Show, on NBC Radio in 1950, featuring his trio (himself, Ford and rhythm player Eddie Stapleton) and his electronics, recorded from their home and with gentle humor between Paul and Ford bridging musical selections, some of which had already been successful on records, some of which anticipated the couple's recordings, and many of which presented re-interpretations of such jazz and pop selections as "In the Mood", "Little Rock Getaway", "Brazil", and "Tiger Rag". Over ten of these shows survive among old-time radio collectors today.  The show also appeared on television a few years later with the same format, but excluding the trio and retitled The Les Paul & Mary Ford Show (also known as Les Paul & Mary Ford at Home) with "Vaya Con Dios" as the theme song. Sponsored by Warner-Lambert's Listerine mouthwash, it was aired on NBC television during 1954-1955, and then syndicated until 1960. The show aired five times a day, five days a week for only five minutes (one or two songs) long, and therefore was used as a brief interlude or fill-in in programming schedules. Since Paul created the entire show himself, including audio and video, he maintained the original recordings and was in the process of restoring them to current quality standards until his death.  During his radio shows, Paul introduced the fictional "Les Paulverizer" device, which multiplies anything fed into it, such as a guitar sound or a voice. It was Paul's way of explaining how his single guitar could be multiplied to become a group of guitars. The device even became the subject of comedy, with Ford multiplying herself and her vacuum cleaner with it so she could finish the housework faster. Later, Paul created a real Les Paulverizer that he attached to his guitar. The invention allowed Paul to access pre-recorded layers of songs during live performances so he could replicate his recorded sound on stage.

What did he do on TV?
therefore was used as a brief interlude or fill-in in programming schedules.