AV1 and AV2 are as shown here:
http://www.trustedreviews.com/Panaso...ma-TV-photos-2
(second pic)

AV3 has a 3-color connector as used by the N900, above which is a round multi-pin connector marked "S-V". A white line connects the round connector to the three colored ones, so I guess they are somehow all AV3. I can't find a picture online; if needed I'll snap one and attach or send to you.