First off, D12-100 is your direct TV Box, Not your TV. A D-12 -100 direct tv box is not an HD box and will only connect to your tv via a coaxial cable or av jacks (red, white, yellow).
If you have lost your remote for your tv and your direct tv remote does not operate it, then you should be able to find the manual buttons on your television somewhere along the edge of the screen.
Toggle inputs till your on "TV" then use the channel selection to toggle it up or down till it's on channel 3 or 4 for Direct tv, If that doesn't work toggle inputs again and try the AV inputs. And of course if you want to use another device toggle inputs to HDMI 1 or 2.
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