If the entire string is out start with a bulb at the end of the string.
Troubleshooting led christmas light strings.
These lights are key.
I have a string of led christmas lights with a problem about 1 2 of the lights are on but very dim the other second half is on normal.
Plug the string of christmas lights into the wall socket.
Look for the lights that have a splash of red on the bulb near the bottom.
A faulty shunt may sound like a catastrophic failure but you can often fix it with the lightkeeper pro.
Fixing any broken circuit involves locating the break then repairing it.
By removing from socket.
The next string which is plugged in after the problem string works normal.
To replace the fuse you must slide the access door open pop out the tiny fuse and replace with a new one.
Two terminal wires should be visible.
Each string has a control to change the color sequence which works normally.
Simply plug in the light strand and remove a bulb that s in or near the dark section.
Most brands of led christmas light incorporate a fuse in each strand.
Then a whole string or perhaps a half string circuit would go out.
If not you may have found your culpret.
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.
If half the string is out look for the dead bulb closet to the end.