Did you check if your A380 is set to PAL or NTSC output? It has to match the type of TV you have.
If that's not the issue, try it out on a friend's TV. If it works on your friend's TV, there's something wrong with your TV's settings or video in jack. If the same thing happens, then you might have a faulty AV cable or there's something wrong with the A380 itself.
Hope this helps!
I play games on: GBC, GBA, GBA SP, NDS, NGPC, Panasonic FZ-10 3DO, NES, Sega Nomad, Sega CDX w/Power Base Converter, PS1, PS2, PS3, Sega Saturn, PC, EGP1000, Dingoo A330, Gemei A330, LetCool N350JP, PAP-GAMETA, GCW-Zero SE, Kyocera Rise, and 2DS.
Currently playing: Legacy of the Wizard (NES), Cave Story (GCW-0), Zookeeper Battle (Android), Theatrhythm Final Fantasy (2DS).