Direct and a Legend TV

If there is an available code you can simply use the instructions for using the remote to find the code. If there is no 4 digit number for you brand then you just the alternate instructions and just click through the codes 1 by 1. When the TV powers off during that routine you have likely found the code that will control the TV.

I have had to go to Direct TV and look up correct codes for make and model.
Code look up

Have you looked in the programming book?

There are also websites dedicated to gathering remote codes for all kinds of way off brand electronics.

http://moxi.com/us/support/MC4R/MoxiHDDVR_remotecodes.pdf