The best option is to use either an electrician s multimeter or a tool specifically designed for repairing christmas lights such as the lightkeeper pro.
Fixing led christmas light strings.
You can harvest the bulbs from this strand to use on your burned out lights.
Buy the led keeper.
For this repair we are actually going to bypass the faulty light.
This will increase the current that goes through the remaining lights because we have eliminated part of the resistance.
All you have to do is push the bulb back into place.
Https amzn to 2jhduoq amazon associate link this video is a follow up to my original how to fix christmas lights video.
This video is about repairing the very common low voltage 3 to 12v led strings based on insulated copper wire with leds soldered across them and dipped in.
String lights usually come with extra bulbs but you can also purchase replacement christmas light bulbs of all voltage ratings including replacement c9 christmas light bulbs and replacement c7 christmas light bulbs.
The easiest and most affordable way to fix led christmas lights is to have another strand available that you will not be using.
Use a secondary string of lights as replacement bulbs.
Two terminal wires should be visible.
Choose led christmas lights this december.
If not you may have found your culpret.
Simply plug the led keeper into the same circuit of the failed led light set.
New christmas light fuses are available where christmas lights are sold and at some electronics stores.
Through the use of place markers provided the process of elimination helps the user to locate the errant bulb or socket.
Unplug the strand and replace the bad bulb with a new bulb of the same size and the same voltage rating.
I fixed mine by taking a copper wire about 1 5 cm 5 8 long and inserting it into the hole alongside the broken terminal wire.
The led keeper uses insulation piercing technology this enables users to tap into the led light sets and illuminate the functional sections.
Sometimes the led christmas light bulbs just get a little lose and the strand of lights stops working because the bulb isn t adjusted right.
Some christmas light strings have more than one fuse in which case they ll be next to each other.
First slide back the plastic covering on the plug to check the christmas light fuse.
It combines a voltage detector bulb.
Led s do not like a lot of current so besides the led there is also a current limiting resistor in each light.