Ive got a sharp tv & it won't pass surround sound from external sources via hdmi or by optical .
It does stereo pcm only.
If your sony surround aound system doesnt have hdmi inputs you are out of luck.
I had to buy a new hdmi arc switching home theatre reciever when I changed my tv from LG to the sharp (the LG had no/issue passing full dolby digital out via optical)