Hard to tell what the problem is from your description. Does the LCD also go white when focused beyond 10'? Do you actually mean white, or over-exposed - I mean can you still see anything of the image? Is it still white if you take it into a very dim light? Is it the same for all picture modes, including manual exposure?
There's a good series of disassembly guides ([guide|4864]) - you could just take it apart and look for any loose connections etc.