Tv operation on battery power?

Keep in mind that some of the non120 volt TVs with the power brick are marked for a bit more than 12 volt DC input. I was recently looking at a few and found a 19 inch 12 volt DC at Walmart for $99, but they also had a 22 inch with power brick for $129, but upon closer inspection the port was marked "input 19 volt DC".

I see plenty of 22 inch 12 volt for sale on ebay, but most are labeled as reconditioned and I'd rather buy from a store that I know I can return/exchange tv if a problem occurs anywhere in the USA