In all the years I have been pooting, I have just had my first monitor failure (HannsG 27" HD LCD).
I never had any LED/LCD/TFT or CRT or any other type of monitor failure - in fact I still have some I bought over 20 years ago that work just fine.
I was wondering how common it is, though - be interesting to know if anyone else has had them?
Both at home and at work I had quite a few screens. Very few of them that failed over the years in some way or another, with some dead pixels or in one case colorful lines running down the screen vertically.
In one case the power supply failed.
Dozens of screens, low single digit number of failures.
But generally speaking even the cheap screens haven’t failed on me often. Granted, I had a cheap HannsG fail, but I also had an expensive Sony fail.
In my professional life (over 20 years of IT and system administration) I saw a few monitor die a “natural death”. Oddly enough they mostly all were VRM issues, with VRM standing for Voltage Regulation Module. Essentially the monitor itself can’t monitor/manage/regulate a safe and precise power feed so it rather self-shut down. 
This usually means they could be repaired but the cost is literally the same as another monitor new so few companies do that.
I’ve only had one monitor fail, a 40” Philips IPS monitor where the power supply literally exploded about a month after the warranty ended.
I replaced it with a 42” Philips IPS on the theory it was just a bad component… the panels have a slight orange cast but other than that they’re just so nice to look at.
Never had another monitor fail, and we’ve had at least 20 (both TFT and CRT) over the years.
I had an MSI monitor for a friggin’ year before it started flickering and dumping. I bought it to finally get off of 60hz and go faster.
Well, that crapped out in about 2 months and I was stuck in 60hz, otherwise it wouldn’t display. I just bought an Asus back in January and it’s been wonderful. I love Gsync.
Wow I just got a replacement - the size is the same at 27", but I went with 1440 this time and it looks like a cinema screen on my desk!
Decided I didn’t need 4k - and now I’m sure I made the right decision. Didn’t want anything larger, either.
Hopefully this one will last a good few years.