This new over the resent air update (OTA) kills the sound Fimware 1.41 just reset the HDMI sound to uncompressed, its all on the DishTV web site
1.Press the Menu button to bring up the Main Menu
2.Select Installation and press OK
3.Select System Setting and press OK
4.Move down to HDMI output mode then press the right arrow button.
5.Select Uncompressed and push OK, Press OK once more to save the setting.
Or a Factory reset.