Even during the 1930s, one has to admit that the technology was still so new that even though it did appear when it did, even as a luxury for those lucky few who could afford one (whether watching the experimental stations in NYC, or Radiodiffusion nationale télévision in Paris, or the BBC Television Service in London, for example), there was actually so much fluidity going on that if you bought a TV set one year, the next year it could be made obsolete due to different technology being used. Eventually, around the late 1930s some sort of workable standard around 441 lines was more or less agreed upon (with some differences, like Britain's 405-line system or France's pre-WW2 455-line system). So were it not for WW2, then 441 lines (or 383i in modern terminology) would be the standard. In North America, the fluidity of the system could even allow Canada and the US to have different TV standards completely, let alone Saint-Pierre et Miquelon (which could either adopt the French 455-line standard, adopt the 441-line standard, or adopt whatever standard the Canadians adopt).
At the same time, however, I could easily see the spread of television massively delayed and more slower in such a scenario, and it's not hard to see why. For the most part in the 1930s, particularly in Europe, the focus for television was largely the capital cities, never provincial centres, and even then television service was still largely experimental even with the officially licensed stations. If television was largely middle-class to upper-class entertainment, as it most likely would have been in OTL without WW2, then that perception could hinder any spread of television, particularly if the focus is mainly on the capital cities and only gradual, if any, deployment to provincial centres. This would still give time for radio and cinema, as mass entertainment, to adjust so that once television gets fully adopted en masse later on (as the perception shifts away from a class-based form of entertainment to a universal form of mass entertainment) it could survive better (as it still more or less does, to a limited degree, in OTL). That is, if it does get fully adopted (which could be more so in North America, but the question would be of degree and how much bickering could one handle - as well as if the Canadians decide to leap-frog the Americans in terms of technological development, which although pretty un-Canadian is definitely possible).