Default MK808B echo on new TV??

I just got a new TV for the spare room and theres an echo when I play my MK808B through it.It sounds fine on the other 2 TV's I have, just not on the new one. A friend suggested getting new wires and HDMI cable but the Xbox and laptop play fine via HDMI on new TV but MK808B has the echo so I'm figuring problem is with it. Any suggestions on how to get rid of the echo please? Its close to the router so that shouldn't be a problem. Its weird and very frustrating...