I just dropped my Lumia 820..

And now the screen won't turn on anymore, as an unemployed student I'm pretty bummed because I really cannot afford this right now, therefore I'm looking for the cheapest and quickest way to get this done (I'm reliant on it.)

I'm hoping someone can help me, I understand that there are two things you can replace while repairing your phone, either the LCD screen or a 'digitzer', how do I know what is the fault?

My touchscreen still works, it's just the area marked red in this image which appears to be cracked:


The glass covering the buttons/camera is perfectly fine, it's the 'screen' 'under' it which is cracked.

Thank you everyone.