bro does your phone still makes sound for noti and when tapping power button 3 times it speaks to you (screen reader mode)? If yes (like mine), I contacted BB through email and they are prepared to give warranty but have to go to their service center by our self. They give like 2 + 14 days to claim the extended warranty using the ticket they gave you.

If you are too lazy to go to their service center (like me), you could buy a new screen for less than rm240 with postage and change it. Very simple and easy procedure. Voila, the phone becomes amazing again. Just for case of SoD, not one where it does not power on at all.