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[Q] Galaxy S4 - No Audio during calls, other person receives white noise.

OP jade77angel

20th August 2014, 02:09 PM   |  #1  
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Hello,

I have a galaxy S4 (canadian version) and have only been having troubles with it within the last couple days. I do develop so I'm not new when it comes to phones but this issue has me at a lose.

Problem:
When I make or receive a phone call there is absolutely no audio on my end, I cannot hear the dial tones or the other person's voice. The only thing I can here is the call connect and disconnect beeps. The person on the other end hears a very loud buzzing/white noise. This noise becomes intermittent slightly when I speak into the problematic device.
It is only when making/receiving a phone call that the audio does not work. All speakers are functioning in all other apps (music player/skype etc.) the mic is also working without a problem when used for other apps.

When the problem first started I was running 4.2.2 firmware. I was making a phone call when the audio cut out unexpectedly having assumed it was a dropped call I made an other attempt but there was no sound at all. I restarted the device and that very briefly fixed the issue. However every time since restarting the phone has done nothing.

WiFi is working fine as well.


Attempts at Solutions:

Restarting the device (with headphone connected and without)
Factory resetting the device (with headphone connected and without)
Flashing updated (and older) stock firmware on to the device
Flashing custom ROMs on to the device
Dialer apps
SoundAbout app
Making calls with headphone connected / speaker phone
All settings have been checked to ensure in call volume has not been disabled

About Device:Currently running: Gummy version M1.02-25-14-NIGHTLY (Please note that when the phone first started messing up I was running stock 4.2.2 and there was no audio during a call between either phone. The Gummy ROM has made some improvement)
Current android version: 4.4.2
Phone Model #: SGH-I337M (Canadian S4)
Baseband version: I337MVLUAMDJ



Any help is appreciated!
Thank-you
27th August 2014, 04:02 AM   |  #2  
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I'm having a similar issue with my ATT SGS4. It started happening randomly...the person on the other end hears beeps and I hear nothing. Speaker/headset with mic don't work either. Only thing that works is Bluetooth oddly enough...but as soon as I switch to speaker, it goes back to not working.

A reboot fixes it temporarily, but then it comes back randomly..either right away or later on in the day.
27th August 2014, 09:21 PM   |  #3  
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If Bluetooth works fine for voice calls then I would guess that it's a physical hardware issue. Perhaps the ADC / DAC for onboard mic and headset is malfunctioning?

For Bluetooth I would also guess that A to D conversion happens within the Bluetooth chip which seems to be working fine.

It would be nice to see a schematic.

Edit: I found a block diagram of the circuit. and this link https://www.ifixit.com/Teardown/Sams...Teardown/13947

So it looks like the audio codec goes straight into the modem but the Bluetooth goes through the Snapdragon CPU before going to the modem. Based on this my original assumption seems to be correct and your mic codec is malfunctioning or there is a physical connection problem.

Hope this helps in any way.
Attached Images
File Type: jpg I9505 block diagram.JPG - [Click for QR Code] (153.7 KB, 23 views)
Last edited by saj222; 27th August 2014 at 10:35 PM. Reason: added picture
30th September 2014, 12:22 AM   |  #4  
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Does this explain why a restart fixes the issue though? If it were solely a connection/hardware issue, a restart wouldn't do crap (unless it re-initializes the circuit and then something causes it to go derp again).

Quote:
Originally Posted by saj222

If Bluetooth works fine for voice calls then I would guess that it's a physical hardware issue. Perhaps the ADC / DAC for onboard mic and headset is malfunctioning?

For Bluetooth I would also guess that A to D conversion happens within the Bluetooth chip which seems to be working fine.

It would be nice to see a schematic.

Edit: I found a block diagram of the circuit. and this link https://www.ifixit.com/Teardown/Sams...Teardown/13947

So it looks like the audio codec goes straight into the modem but the Bluetooth goes through the Snapdragon CPU before going to the modem. Based on this my original assumption seems to be correct and your mic codec is malfunctioning or there is a physical connection problem.

Hope this helps in any way.

10th October 2014, 04:37 PM   |  #5  
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Same thing happened to me, the incall audio chip as gone bad. I had to buy a S4 with a cracked screen off craigslist and swap mother boards and the phone works perfectly now.
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