RCA RTU6549-B User Manual page 15

Connecting a Digital Audio Receiver with Coaxial...
Make sure the power of HDTV and your receiver is turned off.
1.
Obtain a OPTICAL cable, connect it to your receiver's OPTICAL digital
2.
input and the OPTICAL connection on the LINE OUT port on the back of the
HDTV.
Turn on the HDTV and your receiver.
3.
Please Note:
If you want pure digital stream for your receiver to decode, you must also
configure the TV's OSD Sound->Digital Audio Out function. Make sure the
option is on 5.1CH.
If your receiver is making static noises when receiving 5.1CH, you must use
the PCM option instead.
Please reference the receiver's manual as well, to make sure the receiver is
configured to receive signals correctly from the TV.
The TV's OPTICAL out for 5.1CH is ONLY used for antenna/cable
connection. Any other incoming audio signal will be passed out of
OPTICAL in PCM format.
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