Chosen Solution
Hi. I recently got an iphone 6s and it doesnt have sound. Volume keys works but the volume bar is gone, and its not stuck on headphones mode. I replaced the loud speaker and that didnt fixed it, also when calling “speaker” button is greyed out so i cant press it, ear speaker working fine. Camera is not working too, the app is loading fine but the camera freezes a lot and i cant take pictures or record but it works in PANO and Time Lapse modes. I replaced the camera but its not working. Thank you!
I would start by doing a hard reset (Home & Power button for 10 secs) and possibly even a restore of the device (via iTunes) to eliminate any software related issues. However, I suspect you have some hardware issues instead. What has happened to the phone recently; has it been dropped, repaired or came into contact with water? You have pretty much eliminated modular components so all that would be left is a logic board level problem. Troubleshooting at this level is not really DIY unless you are already handy with a meter and reading schematics so you should consider having this looked at by a micro-soldering repair tech.
