Help, needs fixing?

I wondered if anyone could help me with this problem. My Matsui DTR3 set top box is acting up, Using the usual (VCR) scart lead doesn't seem to connect the device to the television anymore, however when the scart is switched across to the (TV) output scart there is a picture, but no audio! It was all working yesterday so I don't know what could have happened. I have unplugged and re installed channels but there is no sound apart from a humming noise on the (TV) scart and nothing on the (VCR) scart that I usually use??