One thing I forgot... There are many TV's out that but we will slice them 3 ways for this post
Some like my DYNEX take 120vac often using a standard desktop/tower type computer power cord... These cords have become the defacto standard for detachable 120 volt cords for some time now.
Some (many) eat 12 volts via a brick.. Now, one would think that since we call the house DC system 12 volts this would be ideal, HOwever some folks report that when they did this the TV did not last long, they felt that the fact the house system is really 13.6 PLUS or MINUS a couple of volts depending on status of battery and equalization that the higher voltage damaged their sets.. Personally I am not convinced but.
ONE of mine is a Samsung, it is a power brick type which means I can easily convert it to run direct off the house batteries.
The thing eats not 12 volts from the brick,, but FOURTEEN, a much better match for house DC system.
Home is where I park it!