I will first start out by saying, it is very important that you have some soldering experience working on solid state printed circuit boards and that you know that too much heat from the soldering iron will most likely ruin the pc (printed circuit) board. If this happens, it can be a very difficult repair. The boards are no longer available for these sets from Mitsubishi so I cannot stress enough, if you have no soldering experience, let a pro assist you in this repair.