Your Panasonic Smart TV may not be producing any sound for a number of reasons. 

This guide by Fixwebnode will walk you through some simple troubleshooting steps that you can take to fix the No Sound issue.

How to Fix No Sound on issue on your Panasonic Smart TV ?

Here are some troubleshooting steps you can try to fix the problem:

1. Check Mute Button

• Double check that the sound on your TV is not muted.
• Press the Mute button on your TV remote and check the display on the screen to confirm that the TV is not muted.

Note: Ensure you check the volume and mute on your separate home theater, surround sound, or sound bar if you have it connected to your TV.

2. Check the Volume Levels

To do this:

• Use the Volume Up / Down buttons on your TV remote. 
• A majority of TVs will have the volume output level on the screen. Additionally, if an external sound setup, such as a home theater, surround sound, or sound bar, is synced with your TV, ensure to regulate and check the volume levels and settings accordingly.
• If the above methods don't resolve your problem, check your app's own volume settings, such as the volume bar on Youtube, to ensure that the volume is not muted.

3. Inspect Input Device

Sometimes, the issue is not with the TV, but with the device sending pictures and audio to the TV.

To do:

• Attempt testing the same program on a different device. For instance, if you are watching cable TV, switch over to a DVD or Blu-Ray device and play the desired content there. 
• If it functions properly, this likely indicates your television set is not the problem, but instead the device that's sending the programming your TV is showing. 
• Try toggling your cable, DVD, or Blu-Ray player off, taking a short break, flipping it back on, and repeating the process.
• If one device is functioning properly (e.g. your DVD or Blu-Ray player), yet the other is not (e.g. your cable box), then it is advisable to contact the provider of the faulty device.
• If the issue is fixed, then you can Exit Menu. To do this, simply Press the 'Return' button or wait around 30 seconds for it to go off automatically.

4. Restart your TV

To do this:

• Press the Power button on the unit itself or on the remote to turn it off. After that, remove the plug from the power outlet. 
• Take a break of 10 seconds before plugging it back in, and switch it on using the Power button again.

5. Make sure the correct audio output is selected

By default, the TV will output audio to the built-in speakers. However, if you are using an external soundbar or speaker system, you will need to select the appropriate audio output in the TV's settings.

To do this, follow these steps:

• Press the Menu button on your TV remote.
• Select Sound or Audio.
• Select Audio Output.
• Select the desired audio output device.

The available audio output devices will vary depending on your TV model. Some common audio output devices include:

• TV speakers
• Optical output
• HDMI ARC
• Headphone jack

Once you have selected the correct audio output device, you should be able to hear sound from your TV.

NOTE:

• If you are using an external soundbar or speaker system, make sure that the soundbar or speaker system is turned on and that the volume is turned up.
• If you are using an optical output, make sure that the optical cable is properly connected to both the TV and the soundbar or speaker system.
• If you are using HDMI ARC, make sure that the HDMI cable is properly connected to both the TV and the soundbar or speaker system.

6. Check the audio cables

It is important to ensure that the audio cables are properly connected to your TV and to the source device as Loose or damaged audio cables can cause sound problems.

To check the audio cables, follow these steps:

• Visually inspect the audio cables for any damage.
• Make sure that the audio cables are securely plugged into the ports on both the TV and the source device.
• Try switching to a different audio cable.
• Make sure that the audio cables are the correct type for your TV and source device.
• Avoid using extension cables for your audio connections. Extension cables can degrade the signal quality and cause sound problems.
• If you are using optical cables, make sure that the cables are aligned correctly. The connectors on optical cables have a specific alignment, and if they are not aligned correctly, the cables will not work.

If you are using optical or HDMI cables, you can also try cleaning the connectors with a soft cloth.

If you have checked the audio cables and they are still not working, you can try the other troubleshooting steps mentioned in the guide.

7. Perform a factory reset

A factory reset is a process that restores your TV to its original settings. This means that all of your custom settings, such as the channel lineup, the input settings, and the picture settings, will be erased.

Performing a factory reset can be a helpful troubleshooting step if you are having problems with your TV. It can also be helpful if you are selling or donating your TV.

To perform a factory reset on your Panasonic Smart TV, follow these steps:

• Turn on your TV.
• Press the Menu button on your TV remote.
• Select Settings.
• Select System.
• Select Reset.
• Select Factory Reset.
• Select Yes to confirm.

Your TV will then be reset to its original settings.

Here are some things to keep in mind before performing a factory reset:

• Make sure that you have backed up any important data, such as saved channels or custom settings.
• If you have connected any external devices to your TV, such as a Blu-ray player or a streaming stick, you will need to reconnect them after the factory reset.
• The factory reset process may take a few minutes to complete.