If your T2200 is only outputting Audio to the TV, and NO Video, it's most likely on a Radio Channel. Press the TV/R button on the Remote Control to toggle between the Radio and TV Channels.
If this makes no difference, try a Factory Default. This option is in Menu > Installation > Factory Default. (Default PIN is 0000)
If issues persist, you may need to inspect your Setup. Try your T2200 on another TV, or with another HDMI/AV Cable to confirm if the issue lies with the T2200, or Setup. There's another FAQ - HERE, that offers more troubleshooting options.
You can contact the Dish TV Support Team for more information, and troubleshooting options. Contact Us - HERE.