When I picked up my Boss SE-50 and SE-70, the displays on both were doing pretty poorly. The SE-50 had a backlight that was much more of a backdim, and the SE-70 had a completely roasted polarizer and so the text that the LCD was trying to display was basically invisible. I had combined the two displays into one fully working and one fully failed display, but that left me one short.
Luckily new displays that work in these units are less than $5 and are a pretty easy swap, so I upgraded both of them to white-on-black displays.
And the results look pretty great.