If the U.S. federal government already had rules in place regarding energy efficiency standards for TVs, that would be true. However, at least I don't know of any federal regulations that exist. In the absence of federal law on regulating certain products, Congress has typically let states set their own laws. Once Congress passes federal legislation, states can't pass their own laws on that subject unless given explicit permission by the relevant federal law.
If California or any other state attempted to set fuel efficiency standards for automobiles over and above CAFE's requirements, an automaker would very likely be able to get such a state law overturned by the interstate commerce clause and/or the constitutional provision for federal law's precedence over state law.
In the case of the Clean Air Act of 1970, California's pollution laws were allowed to remain in place since the state enacted them before 1970, at least to the extent that they did not contradict the Clean Air Act. However, the Clean Air Act prohibits any other state from enacting their own pollution control legislation subsequent to the act aside from allowing states to adopt California's rules in as their own law to supplement the federal requirements.