Whilst a composite video signal sent by any of my VCR and my DVD into my old TV set (faulty tuner) is always correctly displayed IF it is sent through a SCART connector (with pin 8 connected and supposedly carrying +10 V), it is never displayed if it is sent through a bare coaxial cable ("yellow" RCA). Can anyone identify the reason? Both the SCART and the coaxial cable enter into the TV set through the same and only scart socket, in the case of the RCA cable using a simple adapter (where the AV signal is correcly conveyed to pin 20 and its ground to pin 18 of the SCART connector). The SCART cable used does not convey RGB or any other video signal.