if it's within warranty and you have not actually dropped it or sat on it then make a fuss. I got a refund on my sony T3 when that happened but only after an extreme amount of fuss, escalation, legal threat... see the whole saga on sony forum.
these devices should be built fit for normal use, so if you've treated it as you would a fine china cup & yet the screen has failed, then insist on a replacement
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