AVS Special Member
Join Date: Dec 2008
Location: SoCal (L.A. area)
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Page 45 of your TV owner's manual explains how to turn the internal speakers OFF. It also shows you how to switch the audio output on the optical connection between PCM and Dolby.
You didn't respond to Doctego's question though. We can't try to help you if you don't provide information. Do you have source devices and, if so, are they connected to your TV or to the CT150? How are they connected? HDMI?
The recommended way to make connections is connect your source devices via HDMI directly to the CT150 and run HDMI from there to your TV. Your original post doesn't sound like that's the way you set the soundbar up.