All of our monitor testing is done on Dell PCs, not a DVB-C box.
On a PC, the U2414H Menu Color Settings would be = RGB, PC, Standard
You could also test YPbPr, PC, Standard
Then, using AMD or Nvidia, you would go into their Control Panels and force Full. Not sure how the U2414H will respond to the DVB-C box. You will simply need to test it and post the results. For my notes, send me via Private Message the U2414H service tag number.