Are you sure its not the cables? I had an xbox one time I thought was not working because there was no video. Come to find out it was the av cables. I used cables from a different console and it worked. I know you said you tried your wii on tv and it worked but you never said if you tried your wii on those wires or not so I figured I would mention this. Couldnt hurt to check. Might be a quick fix.