LG 55LM670T User Manual page 25

✎ While viewing an external device, these cases may result in image burn:
- a video with stationary caption (such as network name)
- 4 : 3 aspect ratio mode for an extended period
Take caution when using these functions.
✎ Available picture size may differ depending on the input signal.
✎ The screen aspect ratios on HDMI/RGB-PC input are available in 4:3 and 16:9
only.
✎ [For models supporting 2160p] When a 2160p signal is input or your PC
resolution is set to 3840 x 2160, the Aspect Ratio is fixed to Just Scan.