The units are getting more and more tightly crafted. That is, the old units you could pry apart and swap parts but today, it's pretty much an exchange deal. More at http://www.techrepublic.com/blog/cracking-open/five-things-you-should-know-before-trying-to-fix-a-smartphone-or-tablet/617?tag=nl.e067
Call it in, ask and if they turn you down, ask if any flat rate repair is possible or a discounted refurb model.
Many of these things have accident warranties that you can get or may be covered under a credit card purchase. Check what you got for the extended warranty and how you paid for it.
My galaxy note screen has a very fine hairline crack underneath, leaving it unusable, this phone has not been dropped since i've bought it ( 2 months ago) I'm not sure how this happened but I have a feeling it's flexed in my pocket, or possibly over heated, causing the crack?
do you think samsung will cover this under warrenty, or am I looking at shelling out for a repair?]
Thanks in advance.