JOYI-TV (also known as YTS) signed on as the primary FNN/FNS affiliate for Yamagata Prefecture on 1 April 1970, and remained with that network for its first 23 years in operation.

[1] In September 1992, YTS announced that it would affiliate with the All-Nippon News Network (ANN) and carry programming from TV Asahi once its affiliation contract with FNN expired on 31 March of the following year.

In the interim, JOOX-TV (from Sendai, which served eastern portions of Yamagata) served as the network's default over-the-air affiliate and that station, JOBI-TV from (Akita), and JOPX-TV (from Fukushima) were carried by regional cable television providers.

Due to these circumstances, YTS officially terminated its analog television service as originally scheduled on 24 July 2011.

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