That could be your problem.
I've a sony mini dv camcorder dcr-9e. When trying to playback the tape using the jackplug through the camcorder and the white/yellow leads into the tv through scart or plugs socket, get sound but no picture. Sony shop says should play, even if just use yellow lead. No problems playing on touchscreen on camcorder. Help!

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic