[xbox 360] Help, problem with Boxing.

In short, the text in the games on the xbox 360 is sooooo blurry. Read almost nothing, play is not comfortable.
Playing through the monitor for PC 1920x1080. I read a lot of forums, all say that we need native cable. So, I have a native cable, I checked it out.
What to do? Help, can not solve the problem. Tried to connect to the big TV, same problem.