My dog knocked my phone out of my truck and when the phone hit the pavement it cracked the front screen. The phone is still on but the screen is black. I can hear when someone texts me but I cant make the screen come on. I have tried restarting it by hitting the power button, power +volume+ home buttons, and power+volume button and the only sign of life on the screen is the little light in the top left corner indicating I have texts, emails, etc. Am I going to have to replace the entire screen?

I'm thinking its an LCD issue after some research. Can I replace the LCD and just deal with the cracked glass or do I have to change both?