A:AnswerTry pairing with a dvd, Netflix or amazon prime instead of with YouTube, not sure why it wouldn’t be working with YouTube and nothing else. Try also turning off your internal speakers on the. TV so it’s only using the external speaker settings
A:AnswerI doubt it, Samsung and LG have different Bluetooth protocols and programming. But I don't recommend mix matched equipment, there has to be LG rear speakers out there that will match your soundbar.
A:AnswerTurn your sound bar off and then hold the volume up more than 5 seconds, then you should see id set come across the sound bar screen. wait 15 seconds then turn everything on. you should have a solid blue light now on the rear receiver, now you can put in a movie and start adjusting controls.
A:AnswerAre you using an Optical connection between the TV and the Sound bar or are you using a 4k HDMI cable plugged into the ARC(HDMI4) Audio Return Channel?