テレビ台 stands for a "television stand" like this one.
テレビ stands both for a "television" as a medium (e.g. テレビの力, テレビ朝日) and a "television set" (e.g. 液晶テレビ).
テレビ also stands for what in some English words wood be the prefix "tele-" or "video-", like テレビ会議 for a "videoconference".
台 is a counter for devices, so テレビ１台 means "one television set" and Google results could be affected by content containing such strings close to each other.
There is an older and more technical term テレビ受像機 for a television set.
テレビジョン is a synonym for テレビ and describes medium, technology, and devices used for video transmission.
And "TV" as a broadcasting company is usually called テレビジョン放送局.