Chosen Solution
I recently replaced the battery on an iPhone 6s Plus and after the repair the front-facing camera and microphone are no longer working. The only way to make calls is to use a headset. I’ve taken the phone apart again and re-seated all of the connectors that had been removed, yet the problem persists. I’m thinking it could be a logic board problem, but perhaps its the flex cable for the camera?
Always rule out parts problems first. While replacing the battery, you may have damaged the flex cable for the front camera and sensor (which includes the microphone). Did you completely disconnect the screen to replace the battery or did you leave it connected? So I would double check the condition of the flex to insure it doesn’t have any tears. If it looks fine and it appeared to be well connected, then you could try a replacement flex. If that doesn’t work, then you may have a logic board issue.
Apple replaced my battery. Same issue, couldnt hear after making a call. Duh, they turned on my Bluetooth which I never did before. Turned it off and bingo! That problem solved! Only to discover my front facing camera is now black. Going back to apple tomorrow to complain!
