Electronic devices can handle the cold. Problem is when we turn them on. If they have been in the cold and are turned on without coming up to room temp the heat from the electronics can cause condensation. This is what will ruin things. I once had a laptop that I would leave in my car overnight. it had some sort of sensor and would warn me that conditions were such that it would have condensation issues. It would not boot until things inside warmed up. If the tv is cold the first thing that warms up is the power supply. Most new tvs do not work on 120 they convert it to a lesser dc voltage for electronics. This conversion causes heat. if everything else is cold and this power supply gets warm this can cause condensation.
let your tv come warm up with the camper then turn it on.