The station first signed on the air on September 9, 1984 as KLMG-TV; the station originally operated as a CBS affiliate, making it the first full-time affiliate of the network in the Tyler–Longview market since the short-lived KAEC-TV (channel 32) operated in Nacogdoches in the late 1960s. Until channel 51 signed on, CBS programming was relegated to joint primary status on KLTV (channel 7), which also juggled programming with NBC and ABC (the latter of which is now that station's sole affiliation) for many years.