Has anyone seen or heard of the wii picture on the TV fading, it fades to a dark colour and is barely visible. I tried it on a number of tv's and the result is the same.
I've never heard of a problem like that, however as you get the same result on a number of screens you pretty much know that the problem is with the Wii (although it might be the cables .. .. .. .. have you tried using different cables?).
The solution is to contact Nintendo and send your Wii for repair. If you are UK based go to Nintendo Service Centre to initiate a fast-track repair. If your Wii has passed it's warranty period I suggest you should be forgetful and not enter your purchase date or provide your proof of purchase.. .. .. .. .. the repair should then be free.