First of all, I've had that problem before, and its a bad heat sink in your T.V. one of your chips overheats and shuts down the T.V., so its clearly covered by manufacturers warranty.
Second go and confront your sales person, he's ultimately responsible for making sure that you have the applicable paper work so you can take advantage of the manufacturers warranty.
If he dosen't help, get him to call over the manager and confirm that he sold you the T.V., on what day, and tell them that if you don't get your T.V. replaced because its relatively new, that not only are you going to consult the better business bureau, your lawyer, thier competition, and the press, but your going to make sure that none of your hundreds of friends are going to shop there. Also ask for the names of the regional manager, the product manager for Video, and you also intend to send a letter of complaint to every single member of thier senior management team. Make sure that you do this in a reasonible and calm voice, and don't act angry. If these people refuse to help you, then you need to go to the regional office, which if I remember right is attached to the Macleod trail store and do the same work.
You shouldn't have to use trickery or and other crap to get this resolved, your salesperson screwed up and his job should be on the line, and he should want to move heaven and earth to fix this. However if that sales persons not there anymore it might be tougher.
Oh and make sure that you bring the T.V.s serial number with you, they have to track it in thier POS system.
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