That is odd. Those components are on three separate flexes and independent drive circuits on the logic board. The only common denominator I can see is some pry damage that occurred when you removed the screen connectors. Those connectors are surrounded by tiny surface mount components that are part of the circuitry for the cameras, flashes and the earpiece.
You will need to open up the phone again and do a thorough visual inspection, preferably with magnification. Look for partially or fully dislodged components. If this is indeed your problem, then this will require a micro-soldering repair and is not DIY.
You could also try to do a full DFU Restore first (backup your data!) to eliminate any potential software or corruption issues.