Sony XR-55X90K Service Manual page 72

TROUBLESHOOTING
4.3 Input Skip Function
Under default condition;
If user insert analog video cables into video jacks, the Video/Component will be highlighted and can be selected.
The detection mechanism is based on below tables.
Input Signal
VIDEO IN
VIDEO_DET
/AV IN
IC1000 AH9-GPIO56
Non-Detect Detect
(Typical) (Typical)
0V 3.3V
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SYS SET