There's also the possibility of the broken capacitor on the back side of the board.

My point is that lots of things besides the fill nipple can make the display go bad. When he said he broke the fill nipple, I assumed he'd visually verified that it had actually broken off. Now it seems from his last description as though the nipple is intact.

I think I'll update the image in the FAQ to more clearly indicate that the illustration is supposed to be of the missing nipple, not of the normal discoloration of the glass on the corner.

Edit: I take it back. I think the images and text are clear enough as they are.