Al has an old receiver and he wants to connect his TV to it. He bought one, but he's not getting sound from the TV. If he connects it to the Blu-ray player, though, it works just fine. Leo says that he'll need to go into the LG menu setup and disable the onboard speakers in favor of external speaker output. Another possibility is the DAC may not understand the TV signal because it's encoded, while the BluRay Player is using unencoded PCM audio. Al should figure out what audio the Blu-Ray is sending out and see if he can duplicate that setting on the DAC.
Tom can't seem to connect his Nintendo Switch to his 4K TV. Leo says that he hasn't heard of any outstanding issues, but it could be a bad HDMI connection. He should try another cable. The chatroom suggests turning off CEC, which switches the HDMI ports on and off. It may be called something else. It could also be a resolution mismatch, so Tom should check and see if there's another lower resolution port that it will connect to. He can also try another TV and verify that the dock works. If it does, then try the cable.