If you use the SPDIF Cable to connect and it has been successfully connected with your device, but you find no sound output? Please check the following operation:
① Whether the Bluetooth adapter is set to TX mode or not. Please make sure that the SPDIF Cable is correctly plugged into the TX fiber port, and check whether the OPT light and TX light are on or not.
② When you want to use the SPDIF Cable for output, you cannot plug an AUX cable at the same time even if the AUX cable is not connected to any other devices.
③ Please check the audio output settings at your source device. For example, enter the audio output setting of the TV and adjust the output mode to the corresponding output mode instead of the built-in speaker output.
Take Samsung TV as an example:
1.Find "Sound Output Speakers" in Settings.
2.Then select "External speakers".
3.Find "Audio Format".
4.Select "PCM".