My ID-5001 has been dark for the past year. I've not been motivated to replace what's probably a blown fuse because it had become a beautiful clock with a reliable indoor temperature reading and not much else. I built it shortly after the kits were marketed by Heath and it replaced my ID-4001 that I installed in my parents' house.
The original assembly instructions included bending the leads of the LED's on the wind speed and direction boards prior to soldering, but this led to premature failure of the so abused LED's. I ended up replacing many, many of them until I finally learned that the leads shouldn't be bent for just this reason. Once they were properly installed they stopped failing.
When I moved to a new townhome in 1992 I bought new outdoor temperature and humidity sensors and cabling for the wind/rain sensors so I could just leave the old ones behind. Besides the temp/humidity sensors were out of calibration. Unfortunately the calibration of these sensors just didn't seem to last for more than a few years at most.
About 18 years ago the bearings on the wind cup assembly froze up, but replacements were easy to obtain and install. Similarly about 10 years ago the power supply board failed, so I found a new one online to install. Over the years the backlighting fluorescent tube lasted from one to three years before failing and needing replacement.
The rain sensor's thin gauge wire was broken when I fished a cable through my conduit to power my Davis' rain gauge heater, so it stopped working as well.
The real-time wind speed was fantastic! I still miss it and my wireless Davis Vantage Pro2+ comes nowhere near it. I recorded a maximum wind speed of 134 mph during a De Recho in 1993 that flattened trees from Kearney, NE on eastward to past Lincoln. The suction produced on my roof caused a loud crack and my ears popped as the gust whooshed over. The number of downed limbs and trees, all blown over to the east, made streets nearly impassable, and a billboard with steel I-beam supports firmly anchored in the ground on Superior street near Salt Creek was flat against the ground, again to the east, with bent I-beams near ground level.
The display was and is unmatched. Until I got my first Vantage Pro I offloaded my data onto floppies via a primitive laptop, but that data is now lost because of floppy failures.
My Davis units have been much more reliable and accurate, but oh, do I miss that ID-5001 display!