try to change the modulated channel for TV2. go menu,6 system setup , 1 instalation, 5 modulator. u will see tv1-3or 4, tv2 -.. defualt is 60air. u can change it to any channel 21-69air, or 73-116 cable something like that.(read manual)
after u change, if u don't get picture on new channel do auto programm on tv. if it doesn't help just call 24/7 dish customer service.1-800-333dish. there is no charge for telephone support. also check signal strength, u might have weak signal (bad connection) on second tuner.