LG 42LM615T User Manual page 41

✎ This function is only compatible with devices with the SIMPLINK logo.
✎ To use the SIMPLINK function, you need to use a high-speed HDMIⓇ cable
(with CEC (Consumer Electronics Control) feature added). High-speed HDMIⓇ
cables have the No. 13 pin connected for information exchange between
devices.
✎ If you switch to another input, the SIMPLINK device will stop.
✎ If a third-party device with the HDMI-CEC function is also used, the SIMPLINK
device may not work normally.
✎ [Depending on model] If you select or play media from a the device with a
home theatre function, the
Be sure to connect with an optical cable (sold separately) to use the
Speaker function.
HT Speaker is automatically connected.
HT