@Givara, based on James’ explanation of the issue, what you might want to try is an active TOSLink Repeater or Splitter; one that will regenerate your LG TV’s TOSLink signal, in the hopes that the regenerated signal is well within proper specs.
Something like this between your TV and your dCS;
There’re quite a few on Amazon. Make sure it’s an active unit, meaning it requires power, and not one of the passive optical splitters. Shouldn’t cost more than a couple of cups of Starbucks, so no real harm if it doesn’t work 
