Is my screen or my motherboard broken?

Hi!

Recently I have sat on my HTC 630 Dual Sim (ouch!). Part of the screen has been completely destroyed, the other part has become super glitchy, although the phone was still responsive and some actions could have been performed (i.e. typing in the password after 5 minutes). When I pressed the screen with my thumb , the glitches were reduced for the time being.

I decided to replace the screen and I have ordered a new one from AliExpress. The seller had very good comments, majority of them cotained the photo of the screen after the replacment.

Today, the screen was finally shipped to me. The replacement process went smoothly, I have followed instructions found online. Unfortunately, after the replacement, the screen is unusable (literally nothing is being displayed apart from one, wide stripe, picture attached). From the colors changing on the screen, I deducted that the touchscreen is responsive. I have switched back to the old screen which again is partly operational (despite heavy glitches).

My question is: how likely is it that I have recieved a broken screen from the seller? Is it possible that I have damaged the motherboard during the instalation? Are the observed screen glitches typical in former or/and latter scenario?