"Sensor doesn't work after sensor/power cable replacement?"に関する回答in my experience if u put a small piece of scotch tape covered in sharpie over the sensors before installing the new screen works for me. its not an issue with cables or anything its because its a different tint of paint on the two little holes.
"Screen lights up but no picture, phone works but screen is black"に関する回答try holding the power and home button for 10 seconds to force your phone to restart. if that doesn't fix it then open the phone up again and check under the wifi antenna and make sure the data cable for the display is securely pressed down. if it is then you damaged the display and need to replace it.
"Logic board lcd connector thin metal cover came off a little"に関する回答as long as it works and you are sure the connector will not come off while reassembled inside the machine i think it should be fine.
"iPhone screen is blank"に関する回答on the inside of the display LCD there is a screen controller that cracked from the fall. this is what is causing the lines and colors. the touch panel is separate from the display LCD and will still work even if chunks are missing. You must replace the LCD display assembly which includes the touch panel as they are laminated together. There are guides for repairing this in the iphone section on iFixit. I suggest you purchase the assembly from an eBay top rated seller as iFixit is quite pricy.