How to connect my devices

Solution
Looks like that's just a model number for the receiver, not for the system itself.
Is this the system you have? https://esupport.sony.com/US/p/model-home.pl?mdl=DAVDZ170&LOC=3#/howtoTab

And the TV:
https://www.lg.com/us/tvs/lg-55LF6100-smart-led-tv

As per the marketing spec here:
https://esupport.sony.com/US/p/model-home.pl?mdl=DAVDZ170&template_id=1&region_id=1&tab=manuals#/manualsTab

You should be able to run HDMI from the receiver to the TV, which should achieve what you want.
Or you could use Toslink (Digital optical) from the TV to receiver.
Looks like that's just a model number for the receiver, not for the system itself.
Is this the system you have? https://esupport.sony.com/US/p/model-home.pl?mdl=DAVDZ170&LOC=3#/howtoTab

And the TV:
https://www.lg.com/us/tvs/lg-55LF6100-smart-led-tv

As per the marketing spec here:
https://esupport.sony.com/US/p/model-home.pl?mdl=DAVDZ170&template_id=1&region_id=1&tab=manuals#/manualsTab

You should be able to run HDMI from the receiver to the TV, which should achieve what you want.
Or you could use Toslink (Digital optical) from the TV to receiver.
 
Solution