New old topic LED back lights failing.

[bonesy]

Hi guy's,new/old topic led back lights.I'm amazed how many of these sets,from all manufacturers are now turning up with failed LED's.This week alone I've had around 9 sets in with duff LED's.The smallest a 32" Samsung,but most 40-42",from various makers.Now there's a good supply of different LED's available,it's getting more cost effective repair solution.
Just interested in how others are finding this & how you go about repairing.
I use to just buy new strips from CHS,but since they've closed,I've been buying diodes & replacing the duff ones & any that look stressed.Sometimes,if you remove a strip & look at the back,you can see a discoloration,heat mark,although if you put a voltage across the LED it lights o.k.I tend to change these ones out as well.I also take a fresh LED,find the voltage at which it will just light somewhere around 2.6-2.8 volts,so just lit but dim,then do the same with the ones fitted to strip,you will usually find they will light dim at around 2.8 volts,any that are very dim or barely lit I change out.with these dim LED's if you apply around 3 volts,they do light brightly,as normal,but my thinking is I want to avoid bouncers,taking the screen apart again ,I think it helps point towards diodes that might be on their way out.
It would be nice to know what other repairers are doing.
all the best John.