I dont think calling a service engineer from Samsung just to hold the remote for some time while you take the pictures, is a good idea. Since the set is already used, at this juncture, how do you prove that those 40 extra hours are not watched by you but by the visitors of the showroom??
About media, they are better friends to Samsung than to you as they get lot of revenues through their advts. Media will step in only if the court has taken a decision in favour of a consumer for a 'serious issue', not for trivial ones. You need to look at the gravity of the complaint, this is not about seeking replacement for a broken or malfunctioning TV for the media to pounce in. But if you think media is a solution, then you can take your friend posing as a media personnel, and if that gives jitters to the dealer, probably that is the best solution, which everyone here can follow.
Imagine, if the dealers can make huge profits by selling display items then what will they have on display after selling all of them, posters and banners of TVs?
Friend, I am from service industry, I have handled various departments- marketing, grievances and media promotions in the past. I know how big companies react to threatenings when there is no glaring error on their part. They file a response to the notice you sent and it would take several months in the proceedings. Infact, you have to file a suit against the dealer per se, not the company if you decide to take the legal route. My knowledge says 99% of the complaints are settled amicably if it is approached in the right direction not as Mr. Consumer turned Lawyer.
I am asking you a simple question, are you going to switch off your TV and lose your sleep all those months, expecting for a replacement? I am saying try whatever is possible without exhausting yourselves. But it is all upto you.