I know i may get into touble for this but there is a video posted on another site which apparntley shows the box having the sat feed taken out and the picture disappears. It in post 76.
hxxxs://xww.digitalworldz.co.uk/threads/sky-uk-hd-cccam-2018-fix.459628/page-4
Mods please don't ban me just helping out, remove the link if it is not ok.