Touchscreen/Digitizer connector defect, internal issue
My friend has dropped his phone, so I offered to replace his screen.
After replacing the screen the touchscreen/digitizer wasn't working (not responding at all), so I tried another screen and I had the same problem. Even when putting on the old cracked screen.
I tried to remove the protective sticker around the connectors, because I read that replacement screens might have bigger connectors on the flex cable. That didn't help.
After inspecting the connector up close it doesn't look broken in any way. I'm thinking about trying to clean it with isopropyl alcohol, but I don't know if it's going to work.
Does anyone have any other suggestions? I would be glad to hear them.