I cannot seem to find any information on how to use the 3-pin S/PDIF (J4C1) connector on my workstation S5520SC motherboard.I have seen some descriptions on the layout of the S/PDIF definition and references at times to hardware implementation needed as signal levels may not be the same - Intel documents state nothing other than 'pin assignments' - and I hate to guess how to implement this.
From your post, i guessed that you have already checked the TPS.
If yes, which information are you looking for?
Since the audio codec is 7.1 channel audio support based on Realtek* ALC889 with 16/20/24-bit S/PDIF support. I dont know if you have check in the datasheet for the Realtek* ALC889
All the best,