How do I fix Christmas lights that only half work?

What causes half a string of lights to go out?

1. A light bulb has come out of its socket or is half out of its socket and it has brought down the circuit. For light strings that commonly have over 50 bulbs, they are constructed in 2 or more continuous circuits. If a bulb is missing in a circuit only the bulbs in series of it will go out.

Why do some sections of Christmas lights not work?

If a section of the light string isn’t working, there might be a bad bulb or a bad connection between the bulb and the socket (like a corroded socket). If replacing the bulb doesn’t work, it might be a bad socket or broken wiring that needs to be removed.

Why are half of my LED lights not working?

If the complete section between cutpoints is not working, this is a very similar problem to a damaged LED or resistor – most likely caused by a dry solder joint. Solution: In most cases here the only option is to replace that section of the strip. You can do this by swapping the full strip.

How do you find the bad bulb in Christmas lights?

The easiest way to find faulty bulbs on incandescent Christmas lights is with a Christmas light tester. Simply bring the light tester close to each bulb. The tester’s indicator will light up when it’s near a functioning bulb.

How do I know if my Christmas light fuse is blown?

Check the Fuses

You can sometimes tell by sight if a fuse has blown; the metal filament inside the glass cylinder will have a break in it. Learning how to change a fuse in Christmas lights is simple: Open the sliding compartment door and remove the fuse(s).

Why are half my LED Christmas lights out?

If one of your LED light strands isn’t working, it’s probably just because it has a bad bulb. If one bulb dies, it can cause the rest of the strand to stop working. The only way to fix the problem is to find the bad bulb. Sometimes only a section of the lights will go out, making your job pretty easy.

Will Christmas lights work if one fuse is blown?

Take a small tool, such as an eyeglass screwdriver, and pry out the fuses. Then, gently press in the new fuses. Close the cover, plug the lights in, and they should work. Bello notes that if the fuse blows again, it is likely due to damage in the light strand.

How can I test Christmas lights without a tester?

Pull out one bulb at a time, and stick a piece of folded up foil into the bulb socket. If the lights come on, you know that’s the bad bulb. If they don’t, put the bulb back in and move on to the next one.

How do you troubleshoot string lights?

How to Fix a String of Christmas Lights

  1. Diagnose the problem. Carefully inspect each string of lights before plugging it into an electrical outlet.
  2. Find the bad bulb, and swap it out.
  3. Fix the faulty filament or shunt.
  4. Replace the fried fuse.
  5. Upgrade your lights.

Why does only half of my LEDs work?

Why? The heat from the LEDs will make the copper traces expand, then contract as they cool down to ambient temperature. So, if there is insufficient “heat sinking”, or “heat radiating” surface area to dissipate the LED heat, the weakest point will fracture with “stress cracks”.

Why do Christmas lights all go out when one bulb blows?

In this setup, when a filament within any one bulb blows out, it creates an open circuit in the wiring. As we mentioned earlier, when a circuit is incomplete, or open, electricity fails to pass through any of the wire, causing all the lights to go out.

Is it safe to use Christmas lights with a broken bulb?

It’s dangerous to plug in a strand of Christmas lights with an empty socket, so it’s important to test your Christmas lights with a bulb tester.

How can you tell which bulb is bad on Christmas lights with a multimeter?

Quickly Find the Bad Bulb on Your Christmas Lights using a Multimeter

Why are there two fuses in Christmas lights?

Fuse Faults. Typically, these strings of lights have two tiny fuses, one in each side of the AC line, located inside the AC plug. The fuses are intended to melt or “blow” before the copper wires in the string could melt or cause a fire from overload.

Where is the fuse located on Christmas lights?

The underside of the plug is where the fuses are located. Look for the arrows pointing on the socket. They should be pointing away from the cord and towards the male end of the plug. Locate the sliding door that conceals the fuses.