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If your screen is blank but the keypad lights up it shows that the phone is alright but the screen is faulty. If the screen looks broken that confirms it all, but if it does not look broken, then it means the ribbon connector that connects the screen to the main board of the phone has a loose connection and need to be reseated properly.
To do that will require you to disassemble the phone and reseat the ribbon connector or replace the screen depending on your choice.
Consider using a phone case if you are not already doing so. The slight amount of padding may be just enough to help the phone last longer between service. Results from looking on google suggest that this phone has a tendency to have issues with the touch display. Not much mention of the "mouse" though.
its usually happen at k850i.the problem actually from display light on lcd are not lighting. if you have experience in phone you can make a jumper wire to reconnect light line between lcd and PCB(engine).but usually the fastest way are change the lcd phone.simple but need money.may it help.