I have a Wallstreet 2 with a bad backlight. It's a cheap fix, it requires a bit of skill, though. The light tube is very thin and fragile and to remove it you have to slide it free of some rubbery retainer things so you have to work it free without breaking it or you'll have a mess. The filaments also require fine soldering to install the replacement. It's only about $7 for the lamp itself, it's just the labor that's a pain. If you don't know what you're doing, you might be better to find a complete screen assembly including the plastics and just do a swap.