Your understanding is correct. The problem can occur in the set input because the source list changes are affected. It should be clarified that the source list is the configuration of LG TV and Yamaha receiver equipment. It needs to be entered completely first, and then each activity will select one of the items in the list as input. If the list is added or modified temporarily, it may cause the old activity to become invalid. For the problem you have, please repair it as follows: 1. In device mode, open LG edit -- source confirmation, confirm the source switching method, and enter the source list page completely 1) If each input of your device has a corresponding control command, that is, select the first item of the source switching method, the source list only needs to register all the inputs you use For example: AMP input AV2, AV3 2) If your device requires multiple step operations to switch input, that is, select other items for source switching mode, the source list needs to enter all input options of the device in the order of TV display, so that X1 can calculate the step of switching source without error. 2. In the activity mode, check the boot sequence edit -- startup settings of each activity, find the source related commands. If the input is wrong, click the source command, change to the correct input, and then save. After modification, please manually synchronize set-sync with the remote control to make the settings take effect immediately. Try again to switch whether the activity is long