I have installed a new TV in my kitchen and have connected this to my SKY HD box that is situated in my lounge (7m away) through a co-axail cable. Currently the RF2 port is being used on the SKY HD receiver and this connection goes through a 4-way signal splitter before going to the kitchen TV. Both the HD box and the splitter have been used before without any issues (in previous house), however I have a good picture but no sound on the kitchen TV..?? Can anyone help me with this problem?

Thanks.