camera and flash is not working

i dropped my phone outside when it was raining and the water damage indicator shows red inside the phone. i changed the lcd and front camera assembly but i found out that my flash and both of my camera did not work. when i open my camera app, it only shows black screen for both rear and front camera. i used a known good front camera and still shows the same problem. i was wondering that can a bad rear camera module cause my flash and front camera to disfunction? thanks