Dolby Digital Plus sound doesn't ouput from the device connected with the optical digital cable

This is a specification of the product. The TV is designed to mute audio from the Digital Audio Out (Optical) port when receiving Dolby Digital Plus™ audio. To enable Dolby Digital Plus on a Home Theater System, Sound Bar, or A/V Receiver, connect an HDMI® cable to the HDMI ARC or HDMI eARC port on your TV.

If you want to use the Digital Audio Out (Optical) port on your TV, you can listen to Dolby Digital® sound following the steps below. If model-specific information is required to complete each step, check your manual. Manuals are posted on your model support page.

1. Set your TV speakers to Audio system.
   1. Open the Settings screen.
      • Using the Quick Settings button (For models released in 2019 or later)
        1. On the remote control, press the Quick Settings button.
        2. Select Settings.

      • Using the HOME button

        1. On the remote control, press the HOME button.
        2. Select Settings.

   2. The next steps will depend on your TV menu options:

      • Select Display & Sound → Audio output → Speakers → Audio system.
      • Select BRAVIA Settings → Speakers → Audio system.
      • Select Sound → Speakers → Audio system.

2. If available, set the Dolby Digital Plus output setting to Dolby Digital.

   1. Open the Settings screen.
      • Using the Quick Settings button (For models released in 2019 or later)
        1. On the remote control, press the Quick Settings button.
        2. Select Settings.

      • Using the HOME button

        1. On the remote control, press the HOME button.
        2. Select Settings.

   2. The next steps will depend on your TV menu options:

      • Select Display & Sound → Audio output → Dolby Digital Plus output → Dolby Digital.
      • Select Sound → Sound Adjustments or Sound → Advanced settings → Input related or Common → Dolby Digital Plus output → Dolby Digital.