Thought this may be of some help.How a Scart is wired Pin 1 Audio output (right) Pin 2 Audio input (right) Pin 3 Audio output (left) Pin 4 Audio ground Pin 5 Blue ground/Chroma input ground Pin 6 Audio input (left) Pin 7 Blue/Chroma input Pin 8 Widescreen function switching (This is the pin the switches your TV to AV automatically)Pin 9 Green ground Pin 10 D2B input Pin 11 Green Pin 12 D2B output Pin 13 Red ground/Chroma ground Pin 14 D2B ground Pin 15 Red/Chroma Pin 16 Fast switching Pin 17 Composite video output ground/Sync output ground/ Luminance output groundPin 18 Composite video input ground/Sync input ground/ Fast switching ground/Luminance input groundPin 19 Composite video output/Sync output/ Luminance outputPin 20 Composite video input/Sync input/ Luminance inputPin 21 Common groundBlanking and switchingTwo pins provide switching signals.Pin 8, the function switching pin, carries a low frequency (less than 50 Hz) signal from the source that indicates the type of video present.0 V-2 V means no signal, or internal bypass 4.5 V-7 V (nominal 6 V) means a widescreen (16:9) signal 9.5 V-12 V (nominal 12 V) means a normal (4:3) signal Pin 16, the fast switching pin, carries a signal from the source that indicates that the signal is either RGB or composite.0 V-0.4 V means composite. 1 V-3 V (nominal 1 V) means RGB only. The original specification defined pin 16 as fast blanking, a high frequency (up to 3 MHz) signal that blanked the composite video. The RGB inputs were always active and the fast blanking signal 'punches holes' in the composite video. The SCART connector uses this to overlay subtitles from an external Teletext decoder.0 V-0.4 V means composite with a transparent RGB overlay. 1 V-3 V (nominal 1 V) RGB only. There is no switching signal to indicate S-Video. Some TVs can auto detect the presence of the S-Video signal but more commonly the S-Video input needs to be manually selected.
Orignal From: 21 Pin SCART Lead wiring
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