Optical audio out port

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macrumors newbie
Original poster
Jul 31, 2012
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Help. I can't get my optical out port to work. No red light. headphones work. internal speakers work. IMac 2007,1 running OS 10.5.8. Tried 2 different toslink adapters.
 

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macrumors newbie
Original poster
Jul 31, 2012
10
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On the back is a 3.5 audio out jack. It is a dual jack that accepts a 3.5 headphone jack -or- a Female to Toslink Mini Male Adapter to which an optical toslink cable goes in. When inserting this adapter, the audio panel supposed to change to 'digital out'. Can't get the optical output to reflect the insertion of the adapter.
 

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macrumors newbie
Original poster
Jul 31, 2012
10
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The adapter looks like this:

http://www.russandrews.com/product-Toslink-Adaptor-5714.htm

An optical cable goes into this, and the cable itself works on another device. So the cable itself is fine. When plugging this adapter into the port, it changes to 'headphones' in the audio panel -instead- of 'digital out'. I have researched this problem; there are hundreds of posts describing an opposite problem with their imac: the red light won't go out. On mine the red light won't come on.
 

Fester1952

macrumors member
Jul 22, 2012
99
9
Adelaide, Australia
Have you tried using an optical cable with 3.5mm Toslink mini on one end and standard Toslink on the other instead of using an adapter? I have found on my sound system that adapters sometimes just don't work. I was told by a sound system shop that the light degrades through switchboxes and adapters.
 

Peace

macrumors Core
Apr 1, 2005
19,513
3,988
Space--The ONLY Frontier
Have you tried using an optical cable with 3.5mm Toslink mini on one end and standard Toslink on the other instead of using an adapter? I have found on my sound system that adapters sometimes just don't work. I was told by a sound system shop that the light degrades through switchboxes and adapters.
This.

Get one cable not an adapter.
 

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macrumors newbie
Original poster
Jul 31, 2012
10
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No, I have not tried an optical cable with 3.5mm Toslink mini on one end and standard Toslink on the other, however, the adapter is just a 3.5mm plug and should activate the optical switch inside the port (and change the audio panel to 'digital out'). When inserted, the optical light should come on and shine through this adapter. I've gone into midi setup settings also to no avail. I'm wondering if there is a software setting to be tweaked in terminal or elsewhere. I guess I could try putting this adapter into another mac to test it. If the adapter (the second one I tried btw), activates the red light on the other mac, then the problem lies with my mac. I hope the optical circuit is not dead, if that's a possibility.
 

iSayuSay

macrumors 68040
Feb 6, 2011
3,233
350
I agree with OP, that adapter should work just fine with regular TOSLINK (Optical) cable. Plug the adapter to iMac headphone jack, it should activate the red light, and all you gotta do is connect it using regular TOSLINK. Nothing wrong with that. You've done it quite right although a direct mini TOSLINK to TOSLINK cable would also work.

I suggest you set Sound Preferences on OSX? Set it to Optical digital output. Have you tried that?

 

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macrumors newbie
Original poster
Jul 31, 2012
10
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I agree with OP, that adapter should work just fine with regular TOSLINK (Optical) cable. Plug the adapter to iMac headphone jack, it should activate the red light, and all you gotta do is connect it using regular TOSLINK. Nothing wrong with that. You've done it quite right although a direct mini TOSLINK to TOSLINK cable would also work.

I suggest you set Sound Preferences on OSX? Set it to Optical digital output. Have you tried that?

Image

That's just it; there is no 'digital out' under 'choose a device for sound output' to select wether or not the adapter is plugged in or not, ie; 'digital out' should display instead of 'headphone' when plugging it in; it does not; it reverts back to 'headphone' when I plug in the adapter.
 

iSayuSay

macrumors 68040
Feb 6, 2011
3,233
350
That's just it; there is no 'digital out' under 'choose a device for sound output' to select wether or not the adapter is plugged in or not, ie; 'digital out' should display instead of 'headphone' when plugging it in; it does not; it reverts back to 'headphone' when I plug in the adapter.
But the red light does activated, right?

And you connect the other end of TOSLINK to audio receiver, right? What's the receiver display reports? PCM input or something?

Hmm if you have Windows installed you can try and look if your S/P-DIF works okay under BootCamp. If it's no avail maybe it's the hardware problem I'm afraid.
 

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macrumors newbie
Original poster
Jul 31, 2012
10
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But the red light does activated, right?

And you connect the other end of TOSLINK to audio receiver, right? What's the receiver display reports? PCM input or something?

Hmm if you have Windows installed you can try and look if your S/P-DIF works okay under BootCamp. If it's no avail maybe it's the hardware problem I'm afraid.
The red light doesn't activate. The other end is in the receiver, it says 'no signal', so that would suggest no optical coming out of the audio port. I don't have Windows installed. Do you know if there is another utility to check to see if the optical part of the port is working? I did run the OSX hardware diagnostics, said all is fine.
 

iSayuSay

macrumors 68040
Feb 6, 2011
3,233
350
The red light doesn't activate. The other end is in the receiver, it says 'no signal', so that would suggest no optical coming out of the audio port. I don't have Windows installed. Do you know if there is another utility to check to see if the optical part of the port is working? I did run the OSX hardware diagnostics, said all is fine.
Sorry, no idea how to test/diagnose optical port using Terminal or something like that. The red light is the only indicator that digital out might work.

However, you could also check if System Profiler detect it in your system. Doesn't make it miraculously works though, but it shows your system acknowlegde S/P DIF just fine.