any ever had a conxsat that just flashed LNb-F Flashing on the display and will not get a signal and yes my switch is fine and yup ports are rigth and yup current file so kinda stumped and yes lbns on dish are ok watching dn on them with my cw
Turn off the CNX with the back switch and remove your coax from the back of your CNX. Turn your STB back on and see if your lnb failure code goes away. lnb-f usually means a shorted wire/wet lnb but if your other unit is working on the same cables, this may not be the case in your case.
If the error does not go away the fault may be in the unit. If you just bought the box, send it in for replacement.