Solutions:
1. Phones use the main microphone to collect sound when recording. If recording is silent, it is suggested to test the main microphone of receiver loop test in hardware detection to check whether it is normal.
2. When phone take video recordings, it uses secondary microphone to collect sound. If the records are silent, it is suggested to test the microphone to the speaker loop test in hardware detection to check whether it is normal.
3. If the hardware detection is normal, it will be judged as system or three-party software interference.Try to update the latest full package or restore factory settings after backing up data.
4. If the main microphone or secondary microphone is not normal in the hardware detection, it is suggested to apply for after-sales services.