The data I have for a very large number of setup codes does not include either TV/2051 or RCVR/1805

Both Samsung TV's and Onkyo receivers use very consistent IR codes across a wide range of models. A few advanced functions might be different between models, but the basic functions are the same.

When you try some other setup code for Samsung or Onkyo, what happens? If any functions at all work, that provides a very good starting point for filling in all the missing functions.

The 15-2138 includes setup code TV/0702 which covers most Samsung TV's and RCVR/1298 which covers most Onkyo receivers.
Also try TV/0060