Light My Bricks lighting kits contain individual components that are very small and can be easily damaged if not handled correctly.

To prevent unnecessary damage to components, we highly recommend that the User Guide section, "Important Things To Note" is read carefully. Follow the handling procedures in the User Guide to help prevent faults and damages to your Light My Bricks components.

If you are experiencing issues with your Light My Bricks set, below are a list of common causes to help you troubleshoot.

Getting Hot?

If you're checking this guide the chances are something's not working quite right with your lights.  If that's the case please check if anything is getting hot - the power supply or any of the cables or connectors.

The most common cause of lights not turning on is a short circuit - this could be caused by a crossed pin in an expansion board or a wire being crushed between bricks and forcing the wires to touch.

Short circuits can cause batteries to overheat and potentially fail or leak - please ensure that if things aren't working you immediately TURN OFF THE POWER! 

Use this guide to help you isolate the issue, and then turn it on briefly to test as you go.

Check your batteries

Firstly, ensure that the batteries have power using a battery charge gauge.

​If the batteries have no power, replace the batteries.

If the batteries still have power, check to see if the batteries have been inserted correctly into the battery pack.

Flat Battery Pack

This battery pack must have the batteries inserted correctly! One must face up and one must face down.

Correct Installation

Incorrect Installation:

Round Battery Pack

Inside the battery pack is a symbol indicating which side the (round) CR2032 battery should be inserted. The Round Battery Pack takes TWO batteries stacked on top of each other.  Please ensure that BOTH batteries have the "+" symbol facing upwards.

Correct Installation:

AA Battery Pack

Inside the battery pack are symbols indicating which direction the AA battery should be inserted. The flat side of the battery should be paired with the spring side of the battery pack.

If the batteries have been installed correctly and your kit still isn’t operating correctly, the next step is to check the wiring.

Check your wires

In order for Light My Bricks components to fit in between and underneath LEGO® bricks, the components need to be very small.

Due to this nature, Light My Bricks components can be easily damaged when not handled correctly.

Be careful when removing unpacked components out of the packaging and ensure not to forcibly pull at the wires as this can damage the soldering that attach the wires to the LEDs.

If the wiring is detached from the LED itself, the light will not operate.

Detached Wire

Attached Wire

Check your Expansion Boards

It is important to note that connectors can only be inserted to the expansion board in one direction.

Forcibly inserting connectors in the incorrect direction will result in damaging the pins inside each of the ports on the expansion board.

Correct Insertion

Incorrect Insertion:

Bent Pins & Short Circuits

Not only will a light connected to the damaged port not work, but if the pins inside the port are bent to a point they are touching each other, this can cause all other lights in the system to stop working. This is a short circuit.

A short circuit can also result in overheating of the board, cable or batteries. If you suspect a short circuit, DISCONNECT POWER IMMEDIATELY. Batteries can fail, catch fire, or even explode if left connected to a short circuit for too long.

If you suspect you have a faulty expansion board due to a bent pin, try the following steps:

If you look carefully inside each of the ports, each port contains 2 small pins that should be straight. You will be able to identify a faulty port if it has any bent pins.

Bent Expansion Board Pin:

To fix the faulty port, you will need a sharp thin object such as a needle or a pair of tweezers.

Simply use the object to bend the pin back in line.

Once the pins are straight, the expansion board should function correctly.

Fixed Bent Pin:

Isolating a Fault

In larger sets it's not uncommon to wire up everything and then find no lights or only some lights work.

In many of these sets our instructions advise to test at various points as you fit the lights, temporarily connecting a battery pack as you go to ensure it's all working.

Either way, if you are having trouble then basic troubleshooting is needed.

Grab a spare bit light to use for testing - this could be from anywhere in the set and you can put it back afterwards.

Then work your way through the lights connecting it first as close to the battery pack as possible, then to each expansion board in turn.  Disconnect any other lights temporarily to allow this if no ports are free.

This process will help you identify where the issue starts.

Bear in mind a short circuit is always a possibility and this will normally stop the entire lighting circuit from working.

If nothing is working then try disconnecting the connecting cables between expansion boards.  Normally you can do this without having to un-wire the whole kit.  Do this in sequence starting from as far from the power source as possible and you may find that disconnecting one board causes all remaining lights to turn on.  Then you can start checking that board for a bent pin, or the wires to it are potentially crushed between bricks incorrectly.

Still having trouble?

First check this awesome new video from Light My Bricks.  It might help clarify the guidance above and you may be able to solve your problem yourself.  It also really helps to do this troubleshooting before calling us, so you know exactly what's wrong and what we can do to help you!

And then Contact Us! We're here to help.