LG CineBeam PF510QC Owner's Manual page 110

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Setting HDMI External Input
(Q. Settings) → → [General] → [Devices] → [HDMI Settings]
You can apply settings to ensure a clear picture and easy control for the HDMI
connected devices.
[SIMPLINK (HDMI-CEC)]
You can conveniently control and use various multimedia devices connected through
HDMI with the projector's remote control.
For details, please refer to "Using SIMPLINK".