Power cycle your Samsung TV.
There may be a glitch in the current session. Even though this is the simplest fix, it is often the one that works. To power cycle your TV, unplug the power cord for a few moments, then plug it back in.
Check the volume.
The TV may have been accidentally muted. Some sound bars have soft-touch buttons that are easy to brush against and turn off, so check any external sound devices, too. If the Volume Up button on your remote doesn't work, go to Settings on your TV and navigate to Sound > Sound Output > TV Speaker/(external device). If you're using an external speaker, try selecting TV Speaker to see if your external device is the issue. If you hear sound from the TV's internal speaker, the issue comes from your external speaker.
Update your TV.
Outdated TV software can cause sound issues. With your Samsung TV on, go to Settings > Support > Software Update > Update Now.
Perform a sound test.
Test the TV's built-in speakers. Go to Settings > Support > Self Diagnosis > Sound Test. If there's a problem in the test, reset your sound settings in Settings > Sound > Expert Settings > Reset Sound.
Test the HDMI cable.
A bad HDMI cable can lose audio information, which mutes your TV. If you're using an HDMI cable to connect to a sound device, make sure the TV's input is set to the connected HDMI port, then go to Settings > Support > Self Diagnosis > Signal Information > HDMI Cable Test > Start Test. If the cable is your problem, replace it with a new one. Older cables can show signs of sound lag as well.
Disconnect & reconnect external speakers.
Loose connections can cause the no sound issue. While unplugging everything, check to ensure that any cables connecting to your externals are undamaged. Try plugging the cables into different ports if you can, as the original port may be damaged. If you notice that the audio loss doesn't happen in one port, but it does in another, contact Samsung's support for a repair.
Use a different external speaker.
Your external speaker may not be working. If you don't see an HDMI or sound issue from the self-diagnostic tests, and you updated your TV and reset it but still have sound issues, try using a different speaker. Some external speakers will turn off if they have a weak signal, which will cause your audio to drop, so use a new external speaker.
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