LG CineBeam Laser 4K Owner's Manual page 162

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02. [Aspect Ratio] (Command: k c) (Main)
ʢ Adjusts the [Aspect Ratio]. (Main)
You can also adjust [Aspect Ratio] in the [Picture] menu.
Transmission (k)(c)( )(Set ID)( )(Data)(Cr)
Data
01: [4:3]
04: [Vertical Zoom]
06: [Original]
Ack (c)( )(Set ID)( )(OK/NG)(Data)(x)
* If the HDMI input mode supports HD resolution, [Original] works.
* Using the PC input, you select either 16:9 or 4:3 screen aspect ratio.
* The configurable items differ depending upon model.
02: [16:9]
05: [4-Way Zoom]