No sound on iPhone 3GS (debug log with errors inside).

Hi,

I'm trying to fix an iPhone 3GS that has no sound. The speaker, headphones and microphone don't work. It's a phone that was sold (by a lying crook) to a relative of mine. They were told it was jailbroken and unlocked. I don't have any jailbreaking experience, so bear with me...

When it was handed to me, it had:

iOS: 4.3.5 (8L1)
Baseband: 06.15
Manufacture week: 31 of 09 (I'm 95% sure)

I tried to reset / re-jailbreak it using the following:

• redsn0w_win_0.9.8b7c
• iTunes 10.4.1.10
• iPhone2,1_4.3.5_8L1_Restore.ipsw

I loaded up iTunes, shift click restored using the above ipsw and waited for error 1015 to come up. Then I put the phone into DFU mode and ran redsn0w using the same ipsw. It did what I was expecting, but I saw an error scroll by in the console as it was updating. I installed the iPhone Configuration Utility and can recreate the error by plugging in / unplugging a set of headphones. Here it is:

Code:

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Sep 11 04:51:45 iPhone kernel[0] <Debug>: AppleCS42L61Audio: I2C register read failed (0x1b): device error
Sep 11 04:51:45 iPhone kernel[0] <Debug>: AppleCS42L61Audio: I2C register write failed (0x1b, 0x20): device error
Sep 11 04:51:45 iPhone kernel[0] <Debug>: AppleCS42L61Audio: I2C register write failed (0x66, 0x3f): device error
Sep 11 04:51:45 iPhone kernel[0] <Debug>: AppleCS42L61Audio: I2C register write failed (0x67, 0x3f): device error
Sep 11 04:51:45 iPhone kernel[0] <Debug>: AppleCS42L61Audio: I2C register write failed (0x68, 0x3f): device error
Sep 11 04:51:45 iPhone kernel[0] <Debug>: AppleCS42L61Audio: I2C register read failed (0x7): device error
Sep 11 04:51:45 iPhone kernel[0] <Debug>: AppleCS42L61Audio: I2C register write failed (0x7, 0x1): device error
Sep 11 04:51:45 iPhone kernel[0] <Debug>: AppleCS42L61Audio: I2C register read failed (0x22): device error
Sep 11 04:51:45 iPhone kernel[0] <Debug>: AppleCS42L61Audio: I2C register write failed (0x22, 0x80): device error
Sep 11 04:51:45 iPhone kernel[0] <Debug>: AppleCS42L61Audio: I2C register read failed (0x1b): device error
Sep 11 04:51:45 iPhone kernel[0] <Debug>: AppleCS42L61Audio: I2C register write failed (0x1b, 0x3): device error
Sep 11 04:51:45 iPhone kernel[0] <Debug>: AppleCS42L61Audio: I2C register write failed (0x42, 0x3f): device error
Sep 11 04:51:45 iPhone kernel[0] <Debug>: AppleCS42L61Audio: I2C register write failed (0x43, 0x3f): device error
Sep 11 04:51:45 iPhone kernel[0] <Debug>: AppleCS42L61Audio: I2C register write failed (0x44, 0x3f): device error
Sep 11 04:51:45 iPhone kernel[0] <Debug>: AppleCS42L61Audio: I2C register write failed (0x45, 0x3f): device error
Sep 11 04:51:45 iPhone kernel[0] <Debug>: AppleCS42L61Audio: I2C register write failed (0x46, 0x3f): device error
Sep 11 04:51:45 iPhone kernel[0] <Debug>: AppleCS42L61Audio: I2C register write failed (0x47, 0x3f): device error
Sep 11 04:51:45 iPhone kernel[0] <Debug>: AppleCS42L61Audio: I2C register write failed (0x48, 0x3f): device error
Sep 11 04:51:45 iPhone kernel[0] <Debug>: AppleCS42L61Audio: I2C register read failed (0x7): device error
Sep 11 04:51:45 iPhone kernel[0] <Debug>: AppleCS42L61Audio: I2C register write failed (0x7, 0x8): device error


Sep 11 04:52:07 iPhone kernel[0] <Debug>: AppleCS42L61Audio: I2C register read failed (0x22): device error
Sep 11 04:52:07 iPhone kernel[0] <Debug>: AppleCS42L61Audio: I2C register write failed (0x22, 0x80): device error
Sep 11 04:52:07 iPhone kernel[0] <Debug>: AppleCS42L61Audio: I2C register read failed (0x1b): device error
Sep 11 04:52:07 iPhone kernel[0] <Debug>: AppleCS42L61Audio: I2C register write failed (0x1b, 0x3): device error
Sep 11 04:52:07 iPhone kernel[0] <Debug>: AppleCS42L61Audio: I2C register write failed (0x42, 0x3f): device error
Sep 11 04:52:07 iPhone kernel[0] <Debug>: AppleCS42L61Audio: I2C register write failed (0x43, 0x3f): device error
Sep 11 04:52:07 iPhone kernel[0] <Debug>: AppleCS42L61Audio: I2C register write failed (0x44, 0x3f): device error
Sep 11 04:52:07 iPhone kernel[0] <Debug>: AppleCS42L61Audio: I2C register write failed (0x45, 0x3f): device error
Sep 11 04:52:07 iPhone kernel[0] <Debug>: AppleCS42L61Audio: I2C register write failed (0x46, 0x3f): device error
Sep 11 04:52:07 iPhone kernel[0] <Debug>: AppleCS42L61Audio: I2C register write failed (0x47, 0x3f): device error
Sep 11 04:52:07 iPhone kernel[0] <Debug>: AppleCS42L61Audio: I2C register write failed (0x48, 0x3f): device error
Sep 11 04:52:07 iPhone kernel[0] <Debug>: AppleCS42L61Audio: I2C register read failed (0x7): device error
Sep 11 04:52:07 iPhone kernel[0] <Debug>: AppleCS42L61Audio: I2C register write failed (0x7, 0x8): device error
Sep 11 04:52:07 iPhone kernel[0] <Debug>: AppleCS42L61Audio: I2C register read failed (0x1b): device error
Sep 11 04:52:07 iPhone kernel[0] <Debug>: AppleCS42L61Audio: I2C register write failed (0x1b, 0x20): device error
Sep 11 04:52:07 iPhone kernel[0] <Debug>: AppleCS42L61Audio: I2C register write failed (0x66, 0x3f): device error
Sep 11 04:52:07 iPhone kernel[0] <Debug>: AppleCS42L61Audio: I2C register write failed (0x67, 0x3f): device error
Sep 11 04:52:07 iPhone kernel[0] <Debug>: AppleCS42L61Audio: I2C register write failed (0x68, 0x3f): device error
Sep 11 04:52:07 iPhone kernel[0] <Debug>: AppleCS42L61Audio: I2C register read failed (0x7): device error
Sep 11 04:52:07 iPhone kernel[0] <Debug>: AppleCS42L61Audio: I2C register write failed (0x7, 0x1): device error

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To start, was my approach to resetting / re-jailbreaking it the correct way of doing things? Ideally I'd like to restore it to a completely stock phone, but, as far as I can tell, that can't be done with the 06.15 baseband.

Second, does anyone have any idea if the above could be a simple software problem? Any idea what can be done to resolve it? The problem is consistent and everything else on the phone appears to work perfectly.

TIA for any help,
Tyler Durden (Soap Enthusiast)

As much as I hate to say it, it sounds like a hardware problem with the audio DSP. The inability for it to write to the registers and the 'device error' is almost always due to hardware failure.

As far as reverting the phone to stock, you're correct -- with 06.15, the best you can do is what you did. You cannot downgrade the baseband or truly restore to 'stock', but ultimately, the iPad baseband will not cause the issue you're having. It may cause GPS issues, but I've never heard of it impacting the audio DSP before.

Hello!
I came here because I have the same problem with my i4.
Sound dies randomly, on all ports (call speaker, speaker, headset, bluetooth), and only comes back by rebooting.
Strangely, it never fails while I am using it.
I am not sure whether it is fixed with reboot only or not; I have the idea that a time or two it has worked again w/out, but I am not 100% sure.

I am running 4.3.3 j/b, baseband etc untouched.
I too am leaning towards h/w fault, as I didn't install/change anything lately.

I am planning to install ios5 this week (instead of a simple restore) and see what's going next.

Do you have any idea if this is covered by the warranty?

Alexandros

Edit:
Exact error message:

AppleC42L61Audio: I2C register read failed (0xa): device error
AppleC42L61Audio: I2C register write failed (0xa, 0x10): device error

After a second thought it may be a s/w problem, as I wake the device and it tries to reclaim the audio device, something goes wrong..

Hi !
I have the same problem than you.
I spent my last 3 weeks trying to restore, unmount/mount the phone,...
Have you successfully repaired this error ?
I need your feedback please.
Thanks a lot !