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If still no sound after all the troubleshooting, please provide the pictures below.
1. Photo of the transmitter box and headphone, both turned on with their LED lights (Solid Blue?)2. Photo of TV Audio output ports & TV HDMI ports 3. Photo of TV Screen with Sound Settings page - with Digital Optical Out selected (if you use optical cable)4. Photo of TV Screen with HDMI in & Out Audio Format both set to PCM (if you use optical cable)5. If you also have AV Receiver and Soundbar connected, please draw a simple diagram of how you connect them and the audio signal flow.