LG 42LN570T User Guide

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4  Tap the smartphone to the Tag On sticker again.
5  Enter the pairing key displayed on the smart TV into the smartphone. 
When two or more TVs are detected, the pairing key is displayed only after 
the TV you want to connect to is selected in the device list.
6  When the connection is made properly, you can use Tag On.
 
✎ The information of the connected TV is saved in the Tag On sticker. 
You can change or reset the information in the Settings menu of the 
smartphone Tag On app.