Older Pioneer VSX-517 - Coax Audio not working

I finally got around to installing a 5.1 speaker setup using components I've acquired over the last few years. I'm having an issue relating to the Digital Audio Coax does not seem to be functioning, as I get no audio sound form the source plugged into the receiver's coax input.

My set up is:

PS3 --> HDMI Cable --> Samsung HP-S5073 TV --> TV Coax Audio Output --> Coaxial Audio/Video RCA CL2 Rated Cable --> Pioneer VSX-517 Coax Audio Input

I've tried both of the receiver's Coax Audio inputs (1 & 2), no luck.
I've tried 2 other coax audio cables, no luck.
I've tried another source (a DVD player) and it's Coax Audio output, no luck.

Is there a setting I'm missing on the receiver, or "assigning a signal" (I heard I may have to do that, whatever that is)? I've read somewhere online that it may have to do with my TV and its inability to decode and pass any audio other than 2.0 Stereo.

I'm confused, because I thought that my TV would be able to pass through the audio signal to the receiver via a Coax Audio cable.

Can anyone shed some light? Thx

I do not currently have an Optical Audio (Toslink) cable on hand. I was considering trying this option. Once I try this, I'll update.

So here's an online back and forth with Samsung Support:

ORIGINAL MESSAGE from me to Samsung:

I have just recently installed and setup a home theater surround sound system, and am utilizing my Samsung HP-S5073 plasma TV as my video display. I have my PlayStation 3 connected to my TV via HDMI, then my TV's digital coax audio output connected to my stereo receiver's digital coax audio input. The problem is that there is no sound passing through to my receiver. Is the TV able to pass through the audio signal (from the HDMI source - PS3) via RCA Coax cable to the home theater stereo receiver? Searching the Internet, I've read that the TV may not be able to pass any audio signal other than Stereo 2.0, as I am trying to listen to Surround 5.1.

Can you please inform me if my model TV is capable of passing through a digital audio source that is 5.1?

ORIGINAL ANSWER PROVIDED from Samsung to me:

There is a setting on your hometheater that needs to be set at to be able to get the sound to come through. You can use either the RCA(red and white) cables or the digital optical cable. You may need to take a look at the owners manual of the hometheater to see what setting it needs to be on.

FOLLOW UP QUESTION to Samsung from me:

I would like to utilize the Digital Coax OUTPUT on the TV via a RCA-style Digital Coax Audio Cable connected to the Home Theater Receiver's (Pioneer VSX-517) Digital Coax INPUT. The previous answer provided mentions utilizing the analogue RCA Audio Connections (Red &amp White) or a Digital Optical Cable. Does this mean that both devices (Samsung TV output and Pioneer Receiver input), even though both have Digital Coax jacks, cannot use the Coax connections? I have the Digital Coax Audio cable already wired through the wall and connected to the devices, and I do not have an optical cable or Analogue RCA audio cables readily available, therefor using the Digital Coax is my only current option.

I would like to know if my Samsung TV is able to pass Dolby/DTS/Digital 5.1 audio (from HDMI connected source = Playstation 3) through the TV's Digital Coax Audio OUTPUT to my receiver's Digital Coax Audio INPUT? So far, I am having no luck. I'm trying to eliminate my TV as being the bottleneck preventing digital audio from being passed along.

FOLLOWUP ANSWER from Samsung to me:

You need to use either the RCA or digital optical cables. Once you have these cables, you can contact us back for help with the connections, if needed. You may also contact us at 800.726.7864 for help.

So am I confused? Are they telling me that I need to use either a the RCA Analogue outputs or the Toslink (optical) output, and the Coax Audio output will not work? I though that the Coax and Optical were the same, only different in medium (copper vs glass/light)?

Problem Solved:

Ended up being that I needed to assign the Coax Digital Input to a 'source' (i.e. TV/Sat). Working great now. Thanks for those that replied.