Front or Rear camera? I had to clean lots of dust out of my 5s a few days ago. Did you clean it just with a q-tip or did you use alcohol? When taking it apart can you see any dirt on the lense in the housing? Otherwise you should try a new camera, they are not that expensive.
Take a look at this. 4 red blinks- can be LD board or main logic board, check inverter board wires for arcing to ground 6 red flashes- backlight issue, bad main board, or power board or inverter boards- check standby volts on power board. "backlight on" volts should be 3-5v from main logic board then 24v to inverter
So the phone wont start at all? Just Black/white stripes or flickering or something? with both screen? Does itunes see the iphone when you plug on to the computer? Sounds like a logic board problem to me.
do you still have warranty? then contact sony. There are two common problems, bad powersupply and bad mainboard, It seems, that you have a unit with a bad mainboard: Blue light, clicking noise, starting fan and then turning off seems to be a Motherboard problem. Not fixable. this video will show you the differences
Sorry to here that. I guess that after the water damage you just let the phone dry, am i right? The problem with waterdamage is that you now have corrosion and gunk all over the board. There will be one or more Hardware issues, wich need board repair. First you had screen and digitizer. now bootloop and Touch ID problems. Anyway, this probably wont become a reliable phone anymore.