Digital Coax Producing Stereo Only Output (1 Viewer)

[KnyghtMare]

I have an HDMI device attached to my TV. The device is outputting 5.1 surround sound over the HDMI output.
The TV, in turn, is connected to my receiver through the digital coax output/input ports using the video (yellow) connectors on standard RCA cables.
The receiver is only decoding a 2.1 signal (2 channels plus SW). Is this due to the cable being used or the TV only outputting a 2.1 ch audio signal?

 

[KnyghtMare]

Both HDMI cable to the TV will only produce a stereo signal 2.1 using digital cable or analog. In your case you are using an analog RCA cable that is only capable of a stereo signal. Connect the HDMI cable to the receiver then to the TV. If you can not connect HDMI to the receiver use either a digital coaxial cable or a Toshlink Optical cable from the source to the receiver.

The receiver has no HDMI input and the device only has HDMI and a stereo jack as the available sound outputs. I guess I'm going to need to buy a replacement receiver?