I'm sorry to hear about this. It may be that you need to switch your TV to external speakers; I tried looking up instructions for that in LG's manual online, but their menu layout is conspicuously missing.
Ok here is the problem. Just bought the LG 42" LN5300 LED TV and the Samsung Crystal Surround Air Track HW-FM35.
I connected the optical as indicated in the manual from the LG Optical output to the Samsung Optical input. And nothing, nada, zip, zilch.
I have installed plenty of systems up and this one has me puzzled. I have done all the recommendations that I found online and still nothing.
Please if anyone can give me a clue, it would be greatly appreciated. Thank you in advance.