If a mobile phone’s mic not working, speaker not working then it must be an issue of audio ic. In Redmi Note 4, the responsibility of audio is AW87319 IC.
Redmi note 4 audio ic-
This is one of the most commonly used charging control IC in many tablets and phones. If getting hot get it replaced.
AW87319 audio IC is compatible with Xiaomi redmi note4X and Redmi 4A mobile phone.
Redmi note 4 Audio IC price-
please check the price before purchase.
Apart from that, you can also buy a Power supply, SMD rework station, mobile software tools, and other mobile software tools and machine from BEST SERVICES.