According to Lenovo,
You should perform some steps to check whether Lenovo sound is due to the driver or hardware. Follow the steps below to fix the [link|https://fixotip.com/how-to-fix-lenovo-laptop-thinkpad-no-audio/|sound not working Lenovo ThinkPad|new_window=true]:
==== Run windows audio troubleshooter ====
* Select the Search icon from the taskbar.
* Type ***Troubleshoot***.
* Select ***Troubleshoot*** from the list of results.
* Select ***Playing Audio*** and then click on ***Run the troubleshooter***.
* It will find the issue and try to resolve it.
==== Verify the volume is set correctly and is not muted ====
Check the settings in the Taskbar Volume Control and in the appropriate output controls in the Playback Master Volume Control. Also, verify that the device is not muted and is set to a proper level in the Master Volume Control.
* Check the sound in the taskbar and ensure the device is not muted.
* Click the speaker icon ( or) on the Microsoft Windows system tray or taskbar to open the Volume control.
* Move the slider to increase the volume and see if the sound is audible.
* The volume control may need to be checked for several devices. For example, Windows Media Player application websites like YouTube have their own volume control. Check to see if the volume on any of these devices is muted or low.
==== Verify sound is going to the correct device ====
If there are issues hearing sound from speakers or headphones, make sure the sound is going to the correct device.
* Right-click the ***Speaker*** icon.
* Select ***Open Sound settings***.
* Under ***Output***, make sure the correct sound device is selected under ***Choose your output device***.
***Note:*** Make sure any external speakers have power.
==== Set the physical volume controls to an appropriate level ====
* For ThinkPad A, G, R, T, X, and Z series systems, there are volume down, volume up, and mute EZ keys, which can be either round or rectangular. You can find them at the top of your keyboard.
* For older ThinkPad systems, there may be a volume wheel on the side of the unit. Also, the key combination of Fn and Page up or Page down may raise and lower the volume setting.
==== Connect external speakers or headphones to the audio connectors on the ThinkPad system to verify audio ====
***Audio jackDescriptionSymbol***
Stereo headphone jack
The headphone jack is used for connecting stereo headphones or external speakers. Stereo line-in HijackThis jack is used to accept audio signals from external devices, such as line output from a stereo or television system, or a musical instrument, into the computer sound system.[br]
***Note:*** This jack is only on some systems. Microphone jack This jack is used to connect a microphone to your computer for recording voice or other sounds on the hard disk. This port can also be used by speech-recognition software.
==== Set the Windows Default Playback & Recording Audio Device ====
* Right-click the ***Speaker*** icon.
* Select ***Open Sound settings***.
* Under Input, select ***Device properties***.
* Select ***Additional device properties*** under Related Settings and make sure that the microphone is enabled.
***Adjust the Microphone volume***
* Right-click the ***Speaker*** icon.
* Select ***Open Sound settings***.
* Under Input, select ***Device properties***.
* Select ***Additional device properties*** under Related Settings.
* Click the ***Levels*** tab. There will be a mute symbol next to the audio icon if the volume is muted. If there is a mute symbol, click the symbol to unmute, and make sure the volume is set to 50 or higher.
***Update drivers from Manufacturer (Support Site) or Microsoft***
* Search for and select ***Device Manager***.
* Navigate to ***Sound, video, and game controllers***, then right-click ***Realtek High Definition Audio***, ***Conexant SmartAudio***, or ***IDT High Definition Audio***. Select Uninstall.
* Go to the ***Search*** icon, type Control Panel, and then click ***Programs and Features***. On the list of apps, uninstall anything related to Realtek, Conexant, or IDT & Dolby, and then reboot.
* After the reboot, go to the Lenovo Support site at [link|http://support.lenovo.com/|http://support.lenovo.com|new_window=true] to download a new audio driver.[br]
***Note:*** Go to Lenovo Support Site and select your product first before proceeding to download the driver.
Updates are also available with the automatic scan option:
* Go to [link|https://support.lenovo.com/|https://support.lenovo.com|new_window=true].
* Select ***Detect Product***.
* Select ***Drivers & Software***.
* Select ***Automatic Updates*** and scan for updates.
or
When using THINK products, download drivers automatically using the Lenovo System Update (LSU). Download the LSU using the following URL: [link|https://support.lenovo.com/solutions/ht003029|Lenovo System Update|new_window=true].