Hello, I’m Nathan, and I’ll be assisting you today. My livelihood depends on your positive feedback, so your satisfaction is my highest priority.
Sorry to hear you’re having trouble, Richard.
You should have an option within the tvs own setup menu (using the tv remote) where the speakers can be turned off, or set to external.
As for the bose, as long as the connections haven't changed and it is on the proper input mode, you should be able to control it with the dish remote (if properly programmed), by pressing the AUX button on the dish remote, then volume.
You can go into the dish setup menu under remote and program the bose there as the audio device, and set the audio mode to AUX in the menu, meaning that pressing menu on the dish remote will control the bose volume instead of the tv volume.