I have no sound at all from the normal speaker or in speakerphone mode. I have good cellular and Wi-Fi connections and the phone sees to work perfectly otherwise. The battery charges fine through the Lightning connector. Can't use it as a phone though! Did I break the upper component cable in the disassembly? Any other ideas?

Every thing works fine except I have no sound, either on speakerphone or normally. Did I break the upper component cable? I've checked all the plug connections and they seem ok.