1 tv on a 2 tv receiver - do I need to split the signal?

My receiver is for 2 tvs but I no longer have the tv in my bedroom. Instead of splitting the cable is there a way to directly connect the wall jack to the receiver?

Model number would help. Generally, the TV2 out cabling is now superfluous, but the input cabling should remain as is.

I have the 322.

I connect Dish network and they said that I still need the Separator but no longer need the diplexer.

My receiver is for 2 tvs but I no longer have the tv in my bedroom. Instead of splitting the cable is there a way to directly connect the wall jack to the receiver?

It is not clear what you want to do,if you no longer have a second TV why do you want do change anything?
Why did you split the cable?you should use A/V cable to the main TV(red,white and yellow)

The diplexer may have been used to backfeed the signal to the second tv.