I have had this happen once no recent charging involved, i was trying to drain the battery had screen on full brightness with all power saving features off was ok for about an hour then the screen just died. i tried reset still started with back light issue, left it off for around 20 mins then started as normal. put settings back to how they were and had no problems since. wont be doing that again in a hurry gave me a heart attack.
Mobile History = Xperia Z Ultra (current), Xperia Z, Xperia X10 Nexus 3, Xperia S, N900,SE X10i, Nokia N95 8gb, SE W960i,SE k750i, Nokia 3650, Nokia 7600, Nokia 7650, Nokia N8, Nokia N97, Nokia N73, Nokia 6111, Nokia 6680, Nokia 6630, Nokia 7610, Nokia Ngage, Nokia 3210, Nokia 3310, SE W910, SE T68i, Sam D500, Sam D600, Iphone 4, BB 9800,
Ill add the rest as i go along.