LG 55TC3CG-H 55" 4K UHD HDR Touchscreen Commercial Monitor - Manual (Page 30)

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Issues Related to Sound
• There is no sound output.
- See if the audio cable is connected properly.
- Adjust the volume of the product or external device.
- See if the sound is set properly.
• Sound is too dull.
- Select the appropriate equalizer sound.
• Sound is too low.
- Adjust the volume of the product or external device.
• For some models, you will need to purchase external speakers separately since they do not have speakers built-in.
Other Issues
• The power suddenly turned off.
- Check if the auto-off function is activated on the settings related time.
- Power source has not being supplied properly. See if the product power cord is connected properly.
- Check the power control settings.