help screen unresponsive...is it broken?

so i dropped my iphone from waist height accidentally and it was working fine... until i noticed a fade blue spot on my screen. everything worked fine for about a week and one morning all of a sudden my screen wasnt responding to my touch, it wasnt sliding and often freezing once inside. i opened it up then removed the ribbon cables, then reattached it, it worked fine for about a couple of hours then the same problem appeared. so i noticed if i applyed pressure on the screen top right it would work, until the screen turns off, then it becomes unresponsive. I opened it up again and i seen a video saying that it might be the logic board, it told me to bend my phone forward, as i did so. i bent it while my screen was on and off (about 6 times). now my screen doesnt work at all and theres gay bars horizontal on it. i wanted to know is the screen lcd broken (ribbon cable or inside) or did i break the logic board where the ribbon attach? help because i am phoneless and i dont want to waste money on a lcd that may not be the problem!!!