I'm using ADV7403 in non-standard mode. The problem is that when the input cable is not connected, the free-run mode screen doesn't work. The CP_FREE_RUN bit of STATUS Register2 is '1', but the output is nothing. Refer to the setting below.
42 05 01 ;
42 06 0C ;
42 1D 47 ;
42 3A 11 ;
42 3B 80 ;
42 3C 5C ;
42 6A 10 ;
42 6B C0 ;
42 6C C3 ;
42 6D 00 ;
42 6E 80 ;
42 6F 08 ;
42 70 00 ;
42 71 69 ;
42 72 5f ;
42 73 D0 ;
42 74 04 ;
42 75 01 ;
42 76 00 ;
42 77 84 ;
42 78 08 ;
42 79 02 ;
42 7A 00 ;
42 7B 10 ;
42 7c 40 ;
42 86 0B ;
42 87 E4 ;
42 88 e6 ;
42 8A B0 ;
42 8F 04 ;
42 90 43 ;
42 C3 31 ;
42 C4 C2 ;
42 0E 80 ;
42 52 46 ;
42 54 00 ;
42 0E 00 ;
54 00 13 ; Power down Encoder
74 EE EE ; Power down HDMI
End