I also took a look at the TV's manual and have to agree it's not too helpful.
It's also confusing because both the specs and the diagram of the connection panel show digital audio out is coax, but you said you're using toslink??
Let's take a step back and make sure the soundbar is working correctly. Connect your BD player via HDMI to the soundbar, then connect the soundbar to the TV via HDMI. Select the correct inputs on both TV & soundbar. Is it working okay that way?
Assuming it is, then connect your cable box via HDMI to an unused HDMI port on the TV. Connect the Toslink (if indeed that's what the TV has) to the optical in on the soundbar. Try the PCM audio setting on the TV. Select the D.IN on the soundbar. Are you getting audio?
Please report back as to whether any of this is working.