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This is a setting in your laptop- not your TV. Your TV will produce an Audio and a Video signal using HDMI- and there are no settings in the TV to change that.
On your Laptop, depending on the brand, model, and windows version you're using, there will be settings for audio to set the laptop to output via it's own speakers, or the HDMI port. Are you familiar with these settings?
If not, what it the operating system you're using?
While not all versions of Windows are identical, the basic procedure is as follows:
To switch the audio output to HDMI, use the following steps:Click Start, and then Control Panel. Select the Hardware and Sound category.Click Manage audio devices, listed under the heading Sound. ...Among the listed devices, select the device described with HDMI or Digital Audio, and click Set Default.
There are also these steps here which are posted from a Dell blog:
1. Connect the HDMI cable to the computer and TV. If the TV has a "DVI/HDMI" port do not use it. Use a port for HDMI only.2. Turn on the TV and select the HDMI port you are using. Adjust the TV settings to receive HDMI audio if any.3. Turn on the computer. (Optional, some people close the laptop lid immediately after hitting the power button but I am not sure why. Most people should not need to do this.)4. Optional. Some models do better if the TV is set to be the primary display. To set, repeatedly press Fn+F8 (or ctrl+alt+F4) to cycle through the settings (laptop display only -- laptop + TV -- TV only). Reboot the laptop.5. Go to Start>Control Panel>Sound>Playback tab. Make "HDMI" the default device. If "HDMI" is not there, right click in the white area and look under "Show Disconnected Devices" or "Show Disabled Devices" and see if it is there. (This applies only to Vista & 7. XP does not have "show disconnected devices". )
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