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  • Thank you for your detailed answer I accepted and upvoted it. I wasn’t at home so couldn’t open the smartphone again but I noticed that when I plug in headphones the issue doesn’t disappear. I.e. I thought initially that the issue is the earpiece but now checking with headphones the issue remains, the sound intensity for phone calls and voicemails is always the same (but no issue at all for YouTube videos) even with headphones. Do you agree that in that case, the issue is with the Audio IC? This complicates thing, I was so sure the issue comes from the earpiece but apparently it’s more complex Commented Sep 8 at 12:12
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    Good troubleshooting. Do screen volume adjustments (software) and Bluetooth requested volume changes also fail on the phone? Commented Sep 8 at 12:22
  • Screen volume adjustment works with YouTube videos and music but not with phone or Whats App calls (or voicemails). I can slide it up and down but the volume does not change (or even disappear if I put it at zero). So it looks like the sound intensity is somehow stuck for phone calls. Turning loudspeaker on and off works with phone calls but again regardless the volume intensity is stuck. I don’t have any Bluetooth device near me currently. If it’s really the Audio IC this complicates things since this is soldered as opposed to a piece you could easily replace (like earpiece or flex cable). Commented Sep 8 at 12:46
  • sorry to disturb you but I need your input. I discovered that when I switch the physical Ring/Silent switch (the "button" that lies "higher" above the volume physical buttons) on ON, the volume up button doesn't work. HOWEVER when I switch it on OFF (so silent mode is OFF) the volume up button works for a few minutes (and then I need again to ON OFF the switch). During those few minutes when the volume up button does work, every time I use it, I get the notification "Silence mode OFF". Also the phone call volume does actually get adjusted when the volume up button works. Commented Sep 10 at 22:13
  • Does that mean that there is a short circuit between the volume up button and the Ring/Silent switch? I.e. somehow when silent mode is ON, the volume up button signal gets "drowned" into the Ring/Silent switch, and never reaches the logic board, while when it's OFF, somehow physically this allows the volume up button signal to reach the logic board? This would explain why I get a notification with "silent mode OFF" everytime I use the volume up button (during those minutes where it works), i.e. the water caused corrosion and a short circuit between those paths Commented Sep 10 at 22:16