HDMI sound output stopped working all of a sudden

[aezurhvin.dk]

Hi,

Have my LG tv connected with a HDMI cable.

All of a sudden sound in system preference says: the selected device has no sound output.

It has worked fine for months. Have not updated MacOS or done any alterations.

When I go to sound effect, they can be played on the TV.

Audio MIDI setup test, plays sound on the TV.

Whats going on? How can I fix this?

Best regard

Jimmi

 

[Taz Mangus]

Maybe try doing a SMC and PRAM reset.

Reset the SMC of your Mac - Apple Support

The SMC is responsible for managing power on your Mac. Resetting it can resolve certain uncommon issues related to power or thermal management.

support.apple.com

Reset NVRAM on your Mac - Apple Support

If one or more settings stored in NVRAM don't work as expected on an Intel-based Mac, resetting NVRAM might help.

support.apple.com

 

[aezurhvin.dk]

Not sure what that has to do with sound output via HDMI. But might be worth a shot.

I have a MacBook Pro 2019 btw.

 

[Taz Mangus]

Not sure what that has to do with sound output via HDMI. But might be worth a shot.

I have a MacBook Pro 2019 btw.

What version of Catalina are you running?

 

[aezurhvin.dk]

What version of Catalina are you running?

10.15.6

 

[aezurhvin.dk]

Reset SMC and NVRAM/PRAM. Had no effect........ my god........

 

[Taz Mangus]

Try these:

1. https://softwaretested.com/mac/hdmi-not-working-on-mac-after-catalina-update/
2. Boot into Safe Mode and see if the issue happens. Boot back to normal running mode and check again if the issue happens. Safe Mode will cause the system caches to be recreated.
3. Restart to Diagnostics Mode and run the hardware diagnostics. If the diagnostics pass, try the following items steps.
4. Boot into Recovery Mode, Open Disk Utility and create a new partition (Container). In Disk Utility, View→Show All Devices, select the top physical device listed (not select the Container nor Volume), click on the Partition button, set size for maybe 50GB 60GB, name is not important so pick whatever name you want. I suggest a new Container rather then new Volume because it will be easier when it comes time to remove, the Volumes associated with the Container will be removed. Install Catalina to the new Container.
5. Restart to the new partition, setup as a new computer (don't install any third party software) and see if the issue happens. If the issue does happen then it is a bug in 10.15.6 Supplemental update. If the issue does not happen then it is third party software causing the issue.
6. When you are done, restart to your current install and delete the new partition in Disk Utility.

Start up your Mac in safe mode – Apple Support (AU)

To help determine whether an issue is caused by software that loads as your Mac starts up, you can start up your Mac in safe mode.

support.apple.com

Use Apple Diagnostics to test your Mac - Apple Support

Apple Diagnostics, formerly known as Apple Hardware Test, can check your Mac for hardware issues.

support.apple.com

How to reinstall macOS - Apple Support

You can use macOS Recovery, your computer's built-in recovery system, to reinstall the Mac operating system. Reinstalling macOS doesn't remove your personal data.

support.apple.com

Create a bootable installer for macOS - Apple Support

You can use a USB flash drive or other secondary volume as a startup disk from which to install the Mac operating system.

support.apple.com

 

[aezurhvin.dk]

T

Try these:

1. https://softwaretested.com/mac/hdmi-not-working-on-mac-after-catalina-update/
2. Boot into Safe Mode and see if the issue happens. Boot back to normal running mode and check again if the issue happens. Safe Mode will cause the system caches to be recreated.
3. Restart to Diagnostics Mode and run the hardware diagnostics. If the diagnostics pass, try the following items steps.
4. Boot into Recovery Mode, Open Disk Utility and create a new partition (Container). In Disk Utility, View→Show All Devices, select the top physical device listed (not select the Container nor Volume), click on the Partition button, set size for maybe 50GB 60GB, name is not important so pick whatever name you want. I suggest a new Container rather then new Volume because it will be easier when it comes time to remove, the Volumes associated with the Container will be removed. Install Catalina to the new Container.
5. Restart to the new partition, setup as a new computer (don't install any third party software) and see if the issue happens. If the issue does happen then it is a bug in 10.15.6 Supplemental update. If the issue does not happen then it is third party software causing the issue.
6. When you are done, restart to your current install and delete the new partition in Disk Utility.

Start up your Mac in safe mode – Apple Support (AU)

To help determine whether an issue is caused by software that loads as your Mac starts up, you can start up your Mac in safe mode.

support.apple.com

Use Apple Diagnostics to test your Mac - Apple Support

Apple Diagnostics, formerly known as Apple Hardware Test, can check your Mac for hardware issues.

support.apple.com

How to reinstall macOS - Apple Support

You can use macOS Recovery, your computer's built-in recovery system, to reinstall the Mac operating system. Reinstalling macOS doesn't remove your personal data.

support.apple.com

Create a bootable installer for macOS - Apple Support

You can use a USB flash drive or other secondary volume as a startup disk from which to install the Mac operating system.

support.apple.com

Thx for the tip.

Its clearly a software issue, since I can get sound sent to the tv in certain settings. So weird it happened out of the blue. Computers, what you gonna do.

 

[Taz Mangus]

Have you chatted with Apple Support about the issue? That is what I would do.

 

[ahmadawais]

I had the same problem on the late 2013 Macbook Pro 15.6 inches. On resetting PRAM it got fixed. I did reset a couple of times just in case.