Contact the shop and ask for a replacement.
They might prefer to send a tech to repair it. Or even ask you to bring it in so they can send it to the Samsung repair center, but that means you'll be without it for at least a week or two. Depends on the shop, maybe.
Hi! I bought a samsung ln32a550, turned on and it was normal.... after 15-20 minutes de sound just disapear! Strange that when the input in changed (example: tv to avi or svideo to tv) the sound comes back! after another few minutes just disapear again.... looking for ansers... help!!