I bought a new digital converter box (RCA STB7766C) from Target on Saturday and it seemed to be working fine. But 3 days later the audio isn't working. It only plays the background noise but not the people speaking... except on the PBS channels (which I believe are HD if that makes a difference).
It's not my TV (audio on the DVD player works fine).
My TV is set to stereo and changing it to mono didn't make a difference.
Audio settings are set to stereo on the box itself.
It's not my new antenna (signal strength is fine).
And I tried changing out the coaxial cable between the box and my TV but it didn't make a difference.
I'm left to think that it must be the box itself... but could this happen after 3 days of working fine? Is there anything I may have overlooked in my troubleshooting of the problem?