No sound from loudspeaker and rear camera not working

So, my iPhone 5s recently had a pretty bad drop which cracked the screen, both the glass and the LCD. I replaced the entire display and after that I can use the phone again.

However, I get no sound from the loudspeaker. I've been able to verify that there's nothing wrong with the loudspeaker itself, it works, it just doesn't get fed any signal. I can't see any visible damage around the connector plates.

Everything else in the bottom part of the phone, the microphone, headphone jack, home button and charging port works properly.

My other problem is that the rear camera doesn't seem to work. The Camera app tries to load for a while and after that it seems to give up and let me switch to the forward camera, which works. There's no visible damage to the camera, its ribbon cable or the connector.

Does anyone have any ideas on what might be broken and if there's anything I can do?