I bought an used galaxy s2 on ebay and after a few days of use, the screen froze.
I tried to solve updating the firmware, performing factory reset but it didn't work, it seems to be a hardware defect.
This is a video showing the problem that I recorded:
when I turn it on, the initializing sound, volume and touch works fine, but the screen is always the same, frozen, so, the phone is unusable.
Any ideas on how to solve and if it will cost me too much?