Product review (1 stars): Don't Waste your money
Before you replace both boards, get out your digital video camera and look through the viewfinder with the camera on and the flapper closed.  If you see a purple light, then you probably need to replace the board on the right.  If you don't, pull the board on the left and replace the IR LED for about $3 at radio shack.  I pulled mine out of an old remote and put it in the board and it works great!