Lg soundbar nb2020a setup

It may not come with all the cables and it is wireless for Bluetooth also. The manufacturer does not know what connection you are going to use so they may not include any.

Go on ebay and try to find an adapter to facilitate this.

Connect sound bar to audio out jacks on back of tv. Go into setup and select external speaker.

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How to Connect Soundbar to TV audio

Let me see if I can understand what you want to accomplish.
You have a Panasonic Smart TV, and an LG soundbar. But you want to use a set of headphone. I guess that your TV is already connected to the soundbar, no?
The first thing that you need to check is for an output, it must be from the sounbar, it could be a 3.5mm jack, or an RCA jack. Usually soundbars only have input, meaning that only takes the sound in, never out. If you have an audio output from the TV, you c an always try, but the soundbar won't be use then.

Check the trouble shoot section in your ownwers manual. You did not give enough information to help you.

easiest way would be to connect the optical audio output from the tv to the optical input on the soundbar. You may have to go into the tv's setup menu and enable the audio output jack

Make sure red glow is coming from TV's Opt out cable when TV is on. If it is, it is working. The best solution is use an LG soundbar with an LG TV. There is a differnce in digital outputs and with a "service remote" (used by authorized LG servicers) you might be able to change the TVs factory setting to make the vizio soundbar work. but I think you'll be better off with the LG soundbar.

You have to direct the audio out on the tv to the optical output in the setup menu

I'm pretty sure your soundbar has more than 1 input. Check your manual. There probably is AUX input on soundbar and that will allow you to connect to TV, assuming that your TV has any audio out. It could be either white and red RCA connectors or headphone jack.