I am looking at an old TV for my mother (she prefers the old standard 4:3 sets) and found a good Panasonic on offer. Its AV connection only has video and one audio (white), so only mono. Will it work in mono if I connect it with one audio RCA from a dstv decoder, or is there a setting on the decoder that I need to change, or should I rather connect it with the antenna cable? Thanks in advance.