I just need the codes for Panasonic sc-htb70 soundbar to mate my jvc tv

Is there a AV output on the TV ? Usually either a pair of RCA;s (white/red) or a 3.5mm headphone jack. Try that

Hi,

That really depends on what connections are on both the TV and the soundbar. Optical connections provide the best sound quality, but your TV and soundbar may not have that connection. Your manual for your JVC should show you all the different ways you can connect that. I would compare that to your TV's connections and look up the quality of the signal for all the connectors that match both. Hope that helps.

Connecting your xbox one console to a sound system. this setting allows you to adjust how much the volume change on your tv using the volume up or down.

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You will need an optical digital audio connection for the TV and the TV will have to be fitted with a compatible "optical digital audio" OUT connection.
The soundbar unit you have does not have an HDMI connection so you only have the one choice with cable..
Any electronics store selling cables will fit you with the correct one.
The one pictured here next to the HDMI cable is the type you need (aka Toslink) but if you don't have an Optical digital Audio Out connection on your TV you have a problem.
HDMI vs optical Which digital audio connection to use CNET

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.

Look on the Panasonic website.

If you have connected the optical cable then you should be able to select AV using the TV remote, keep pressing until you hear sound from soundbar!

use the universal remote control converter setup .

This is the best i can do mate hope it helps:
http://www2.panasonic.com/consumer-electronics/support/Audio/Home-Theater/Micro-Systems/How-To-Guides/model.SC-PM01.H#ts