I tested it with the LCD in place before putting everything back together.
Good thing!
Not only was the readout too dim, but it was also GREEN! Sure enough, there was an orange filter back there. I tried replacing it with a piece of white copy paper, but the light distribution was spotty. I found some thin "For Sale" signs with a nice unprinted white section at the Dollar store for $.75 that were perfect for a new white filter.
