Sharing Galaxy S8 Screen with a Panasonic Viera TV


I have a Galaxy S8, a Panasonic Viera TX-40CX680B TV and a Cambridge Instruments Sound Bar.

I have my TV set connect to the sound bar by fibre optics so that in normal use the sound comes through the sound bar. When changing the sound volume using the remote control, the screen shows that I am changing the headphone volume.

I have chosen a fibre optic connection because the Panasonic TV and Cambridge Instruments sound bar are incompatible by hdmi and will only connect by fibre optics.

I set up the TV as follows
1. Home on remote
2. Devices
3. Mirroring
4. Yes
The TV now awaits signal from phone.

I set up the phone as follows
1. Swipe down with two fingers
2. Smart view
3. Select Panasonic TV
4. Select continue on TV

The screen now mirrors successfully on the TV (as hoped for) but there is no sound either on the mobile or the TV.

Is this due to the use of the soundbar or is there some other explanation.

I would appreciate your help


Galaxy S20 Ultra
News Moderator
Using your TV in a home theater
Your TV has several features that make it an ideal TV for a home theater. But you might not notice them because they remain in the background until you decide to use them.

Using your TV in a home theater. The internal speakers are also turned off when you use the headphone jack.

[paste:font size="4"]Changing the audio mode
Your TV has two audio modes, accessed by navigating in the Home screen menu to Settings>Audio>Audio mode:

  • Stereo—Use this setting for internal speakers, headphones, and external stereo amplifiers connected through the HDMI1 (ARC), OPTICAL DIGITAL AUDIO OUT, or headphone jack.
  • Auto—Use this setting to automatically detect the best audio setting based on the audio stream in the content you are watching. If you have connected your TV to an external Dolby Digital or Dolby Digital Plus compatible amplifier, receiver, or sound bar through HDMI1 (ARC) or OPTICAL DIGITAL AUDIO OUT, your TV automatically selects the appropriate surround sound capabilities of the device based on the characteristics of the current program.
HDMI ARC—The HDMI Audio Return Channel enables your TV to output digital audio on one of its HDMI connectors. The connected amplifier can also function simultaneously as an input source to your TV, if needed. To use the ARC capability, you must connect an HDMI cable from your amplifier's HDMI ARC connector to the HDMI1 (ARC) connector on your TV. You also must:
  • Be sure your HDMI cable is certified by HDMI.
  • Enable HDMI ARC under Settings > System >Control other devices (CEC), as explained in Enabling HDMI ARC.
  • SPDIF—Your TV has an OPTICAL DIGITAL AUDIO OUT connector that outputs a digital audio signal. To use the optical output, connect a digital optical audio cable from the amplifier to the OPTICAL DIGITAL AUDIO OUT connector on your TV.
    Dolby Digital Plus format is not available through the OPTICAL DIGITAL AUDIO OUT output. This format is only available through the HDMI1 (ARC) connection.
After making the required HDMI ARC or digital optical audio connection, go to Settings > Audio > S/PDIF and ARC option and select the audio format to use.

In most cases, Auto detect is the best option. Other settings can result in no sound when the content you are viewing does not contain the audio stream type you selected.

[paste:font size="4"]Controlling other devices through CEC
Consumer Electronics Control (CEC) enables your TV and other CEC-compatible home entertainment components to control one other in various ways. First, the CEC-compatible devices must “discover” one another and report their capabilities. After this, one device can control another according to the features you enable. For example, playing a disc on a Blu-ray player could switch your TV to the Blu-ray player's input. Or, powering off your TV could also power off the Blu-ray player and the home theater receiver.

Turning off the speakers) and resumes local control of volume and mute state.

To enable or disable system audio control, in the Home screen menu, navigate to Settings > System > Control other devices (CEC) and highlight System audio control. Press OK to enable or disable the feature.

[paste:font size="3"]Enabling 1-touch play

1-touch play enables a component to control which TV input is active. For example, pressing Play on your Blu-ray player switches your TV to the Blu-ray input.

1-touch play is disabled by default. To enable 1-touch play, in the Home screen menu, navigate to Settings > System > Control other devices (CEC) and highlight 1-touch play. Press OK to enable or disable the feature.

Enabling system standby
The system standby feature causes other components to power off when you power off your TV. Depending on the CEC System Standby implementation, it also might enable connected components to power off your TV when you power off the component.

System standby is disabled by default. To enable system standby, in the Home screen menu, navigate to Settings > System > Control other devices (CEC) and highlight System standby. Press OK to enable or disable the feature.