Its very unlikely that its anything to do with the TV, as if you select A/V on the TV that immediately switches its input to the RCA sockets, the only thing to check is whether or not whilst in that mode there is a selection of either "S" video or normal A/V input, the video being on the yellow RCA plug. Also remember that "S"video does not carry any audio, you still require the RCA lead for that, the audio plug being either black, white or red.

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