Thanks for the help. That website is especially useful for the future, even if it did not yield results here. I called JVC and the tech tried to help me identify the part but in the end he doesn't have a part number for D1 because it not considered a replaceable part -- they usually replace the entire board. I ordered the whole board for now -- but my hope is when I get it to be able to identify the diode off of the replacement and get the original working so I can return the replacement. If I can't identify it, then I will keep the replacement board.