Hi, i tried soldering 2 cables to Y and C and they are outputting s-video. Do that means that a good gamecube s-video cable will work fine?

I could not find this model in the revisions database, Brazilian Pal normal black. More pics of it:
http://www.mediafire.com/?50jdn7zq48srf3xModel: NUSM-001(BRA)

*edit 3: There are 2 places for stickers in the bottom, if it had another sticker with the serial, it's gone. There is only one, almost unreadable and it has the same PNxxxxx number of the other one in the bottom of the motherboard.