TV Repair Questions? Ask a TV Technician for Answers ASAP
Hi, I'm Nathan.Sorry to hear that you're having trouble with this but I'll do my best to help you.
This tv does not have an auxiliary output. Those red/white ports you are using are inputs, not outputs.
You could use a stereo to minijack (3.5mm) adapter and connect to the headphone port, but that will only work for internal sources (aerial), if you are inputting a hdmi device to the tv, it won't work.
What you should do instead here is use the optical (digital audio out) port on the back of the tv, with a fiber optic cable, and connect that to your soundbar: http://amzn.to/2ypOpkH
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Thanks for the update, glad to hear it is working for you,
You should not have to mute the tv, but it is normal to do so, as you don't want them conflicting with each other. You should have an option in the tv menu to disable the tv speakers entirely. That doesn't necessarily help the remote situation, but you don't have to mute it all the time at least.