Handsfree and headset audio section of the Samsung Galaxy A12 (SM-A12) schematic, 3.39 MB PDF. It helps when a wired headset is not detected, plays sound on only one side or its microphone fails, letting you follow the jack or accessory detection, the audio lines and their protection parts back to the codec. On phones without a separate jack, check how the accessory audio is routed on your board. The name gives no model suffix or revision, so verify these first. Any PDF viewer will display it.
The button opens the matching file on RM Schematics, or a source page if it is not catalogued there yet. The original attachment is from @phoneSchematics. Enginerys does not host this file.
How to open a .pdf file
The standard format for schematics, block diagrams, power-sequence charts and service manuals.