no focus back camera - G4 Q&A, Help & Troubleshooting

Screen side (front) camera is fine. But suddenly main camera won't auto focus. Tried toggling. Restarting. Removed battery and cleaned the guts and SIM. Still no auto focus.
unlocked and rooted, but stock ROM.
Is the little red LED the auto-focus and does it come with a camera module?

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Whatsapp Camera

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Question Recording video in dark will loose focus when detecting face

I record in a slightly dark room. Focus works perfectly great, but the second a face pops into the frame, the camera looses focus and when the face leaves the frame, the camera has perfect focus again.
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