Audio coming from both TV Speakers and external soundbar - how do I suppress the TV audio output?

Just after my warranty expired, my Toshiba 55TL515U started to play sounds through both the TV's speakers as well as outputting audio to my external Polk Audio soundbar, which is connected to the TV via the Digital Audio Output line. The TV never did this after I connected the external soundbar until a few days ago.
I don't want any sound to come out of the TV speakers, I only want sound to come out of the soundbar. There's a horrible echo effect that occurs when both sound systems are active.
I don't see a setting on any of the TV menus to control this. I would assume that if the TV senses an external audio device, it would no longer output any sound to the TV's speakers.
Is there a setting on the TV I'm missing, or is this something broken within my TV?
I called Polk Audio tech support, and they claim it's not a problem with the soundbar, but with the TV.
If anyone can comment on this, I'd be very thankful.

I have the same problem. When I mute the TV, I get sound only from Soundbar which is fine. But, everytime I turn on my tv, I had to mute my tv. And if I accidently press the volume button on TV, then both TV and Soundbar plays sound and that sucks.

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