Dynavsion spark plus and enigma 2 signal issue

i tried so many e2 images but all have same problem icant get signal on most of frequencies. dont know what to do. nilesat i get 80 channels out of 500 channels hotbird ***itlalia and so many others i cant receive. i think it might be tuner drivers issue. any solution wil be appreciable all other stuff like remote and other stuff ok except signal issue.