LG CineBeam Q Owner's Manual page 21

Turning Power On with USB-C
To turn the power on using the USB-C input port, the external device (USB PD adapter,
charger, battery) must support USB Power Delivery 65 W (20 V/3.25 A) or higher
profiles.
Purchase and use a USB-C AC adapter of 65 W (20 V/3.25 A) or higher certified by
USB PD through an e-commerce site.
NOTE
• Connecting an adapter with an output lower than the rated adapter may cause
the device not to turn on or to operate abnormally.
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Off
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On