Go into setup>audio and try setting Dolby Digital to OFF. Sounds like Denon can handle 5.1 but TV needs PCM. Same with my TV.shadco said:This morning while switching around channels the audio cut out on my HR20. It's connected to a Mitsu 52" LCD by hdmi.
Remote based reset hasn't helped nor has switching the audio settings via the menu. A TV power off and back on also hasn't helped. I connected std audio cables between the normal audio out of the HR20 to the set and again no sound.
The digital out from the HR20 to my Denon HT receiver does work.
The TV's sound works fine when I set the input to cable which is hooked up to comcast.
TV is under extended warranty and DVR is under svc contract with DTV