Questions tagged [repair]

Bricks and Elements sometimes break - perhaps we can help you fix them?

Filter by
Sorted by
Tagged with
2 votes
1 answer
70 views

Where can I get replacement battery connectors for old Lego Duplo Train?

I have the same Duplo Train that Pieterjan posted a picture and video of in September ('Old Lego duplo train not working on batteries'). In my case, it is clear that the battery connectors are ...
user avatar
0 votes
0 answers
47 views

How do I disassemble Powered Up Motor XL? [duplicate]

My question is, how do you take the XL motor apart? I tried with my knife and hands, but unfortunately, it is still whole in one piece (tabs). I got the XL motor from the set 42099 and I would to make ...
user avatar
7 votes
3 answers
139 views

How to open first version of the pneumatic cylinder? (Part no 4688c01)

I have a Lego Technic set 8040 from 1984 with the first version of the pneumatic cylinder. Unfortunately, the shaft on the cylinder broke. Apparently the top of the cylinder (lid) is glued. Is there a ...
user avatar
  • 221
5 votes
1 answer
83 views

EV3 Home Shuts down after 2 min. (lights orange, and 3 Icons Triangle, Gage, Manual)

I just purchased a second hand LEGO Mindstorms Home EV3. The brick turns on, allows firmware update, etc. However, after about 2 minutes the unit makes a noise, LED's turn red, and 3 icons appear. ...
user avatar
  • 51
5 votes
0 answers
145 views

How can I prevent rubber bands disintegrating?

These two answers partially answer this question., but I think it's worth its own question to find more options in a more comprehensive answer. Old Lego rubber bands are known to become brittle over ...
user avatar
2 votes
0 answers
85 views

NXT Sensors/Motors not working

I went back to using the NXT brick after two years and I'm having some problems: Motors do not respond to degrees or rotations; Ultrasonic Sensor and Color Sensor are not working; Touch Sensor is ok; ...
user avatar
6 votes
0 answers
192 views

Fix Lego M Motor - The hooks aren't budging

I have a Lego M motor that is broken. I'm following the instructions here to try to fix it but the little tabs that hold the plastic frame together just won't budge no matter how hard I'm pushing them ...
user avatar
  • 1,089
5 votes
0 answers
182 views

what plastic is used in the floatable hull of 60266 Ocean Exploration ship?

I need to know what plastic is used for the hull (dark blue) of the 60266: Ocean Exploration Ship, in order to glue a reinforcement on. I bought this for my boys (younger than the advertised 7+). It ...
user avatar
7 votes
1 answer
163 views

Reinforcing a pair of Bent Double 11.5 Liftarms under Rotational Tension

I purchased a clone MOC out of interest a few months back, this following set. Because it does use clone pieces, I knew there was a high chance of breakage and poor fit, especially in the tensegrity ...
user avatar
  • 173
11 votes
1 answer
170 views

12V LEGO train tracks splinter

I have an older 12V LEGO train (several actually) but of course the rubber tires wore out long ago. The trains still run quite well (I even used them as a motor parts in some Technic designs), but the ...
user avatar
  • 211
5 votes
1 answer
152 views

Broken pneumatic distribution block

I have a first-generation Lego Pneumatic set (nr 8851) that I recently took out of storage. I remembered from the last time I built the set that the pneumatics weren't working and I just confirmed ...
user avatar
3 votes
1 answer
97 views

What is the maximum voltage for motors from Cybermaster units?

I recently bought a non-functioning Cybermaster unit [part:71797]. As the motors in there might be perfectly fine, I'd like to use them. I could not find information on these motors (as opposed to ...
user avatar
  • 133
10 votes
3 answers
1k views

Old RCX Wires Have Become Grey and Brittle

I have a LEGO MINDSTORMS Robotics Invention System 2.0 (3804) that I acquired back in 2003 (17 years ago), and the wires have become grey and brittle. The wires used to be black and smooth, and ...
user avatar
3 votes
1 answer
197 views

Miniature Lepin box door stuck inside box itself

Yes, maybe the title may be confusing, but this image says it all: I got a Lepin city set not too long ago, and it included this box. I have no idea how this happened but during use the door ...
user avatar
4 votes
0 answers
160 views

Repairing a 12V switch motor

My son caused me to dig up my old 12V lego trains. Surprisingly they mostly work, except for one part: https://www.bricklink.com/v2/catalog/catalogitem.page?P=70026&idColor=9#T=C&C=9 This is ...
user avatar
  • 141
5 votes
0 answers
93 views

How do I fix a loose joint between the top and bottom of the digger base?

How do I repair a loose-fitting joint between the top and bottom of the Duplo digger base? It has been used for only about a year. Is the wear more likely on the top or the bottom piece?
user avatar
1 vote
3 answers
282 views

Lego Mindstorms NXT 2.0 brick is not working

Recently, I tried to get my old NXT 2.0 brick fixed. Everything seemed to point to the clicking brick problem, but it turns out not to be the only thing, the brick was also getting hot. After ...
user avatar
  • 11
2 votes
0 answers
127 views

How to repair warped plates [closed]

I have some large plates and a boat hull that have warped due to temperature, and I would like to fix them. Is there any way to do so? And if not, is there any way to replace them? I tried contacting ...
user avatar
6 votes
1 answer
105 views

Non-standard diameter pole - reinforcing a repair

I have (or rather my daughter has) a Fabuland umbrella which has been snapped off where it meets the base (probably over 30 years ago when her mum was a child). I've seen Can I repair a broken LEGO ...
user avatar
  • 555
5 votes
2 answers
493 views

How to locate pneumatic leak

I have a simple pneumatic claw with a 2 pump compressor that I built somewhat recently. It worked fine for a while, producing up to 4 bars of pressure, but then the system wouldn't increase the ...
user avatar
4 votes
0 answers
440 views

Lego Mindstorms NXT 2.0 Not turning on

I have a Lego Mindstorms NXT 2.0, which worked well for a couple of years. However, after the last few weeks, it seems to not boot up. I took it apart, and noticed it seems to have a different ...
user avatar
2 votes
1 answer
92 views

How to fix cracked minifig arms?

I have a few minifigs with their arms cracked lengthwise, which is a big problem as the hands constantly fall off at the slightest touch (or even fall off of their own accord). Is there any way to fix ...
user avatar
3 votes
1 answer
72 views

Power Function IR Remote always emitting after putting batteries

My PF IR remote led indication light is constantly on after I put in new batteries. It stay on without me touching anything. A quick check with my phone camera showed that the IR emitter is emitting. ...
user avatar
  • 31
14 votes
3 answers
6k views

How to disassemble LEGO train engine base part# 28743?

I have one of the new Bluetooth engines (part 28743, but in the bottom it says Hub No 5 model) that has started to under-perform and make some noises, I think that it need some maintenance (maybe due ...
user avatar
  • 345
1 vote
1 answer
126 views

My DUPLO railroad engine stops after 20cm

My DUPLO railroad engine stops after 20cm moving. I suppose the sensor in the front axle is damaged. So is it possible to repair it?
user avatar
4 votes
4 answers
2k views

My LEGO character's helmet keeps falling off... Is there any way to fix?

My figure won't keep its helmet on and if I get it on it is very loose and will spin around.
user avatar
  • 41
1 vote
0 answers
39 views

How can I get this broken part out? [duplicate]

My New LEGO minifig has a broken hand because of me. How can I get this broken part out?
user avatar
  • 11
2 votes
2 answers
751 views

Problem With Bionicle Joint Sockets Cracking, Repair Options?

I'm pretty sure that serious Bionicle fans have all dealt with cracking of the joint socket pieces. However, is super-gluing the broken parts a solution? I'm worried that the joint socket won't be ...
user avatar
  • 53
12 votes
1 answer
1k views

Replace Battery in LEGO Dino Attack Light-Up T-Rex Head?

Is it possible to replace the battery of the LEGO Dino Attack T-Rex head? There's a button on the top of the head that makes the eyes and tongue light up red, presumably via a red LED. There doesn't ...
user avatar
14 votes
2 answers
689 views

Is it possible to dismantle and refurbish an original 870 Technic motor?

I have a couple of ancient 870 motors (the 4.5v ones) that run but don't sound great. I've looked for, but can't find, a guide on how to dismantle them. I'd like to either get in there and clean/...
user avatar
  • 243
6 votes
2 answers
3k views

Repairing disintegrated old 9V wire

I have a number of old technic motors and battery boxes I would like to use however the wires have disintegrated in storage to the point that the metal conductors touch and short out. Does anybody ...
user avatar
  • 183
5 votes
1 answer
226 views

Why are my pieces breaking? "3612 Arm piece straight with 2 and 3 fingers"

I've dug up my old LEGO (from 1990's) and most bricks are simply scratched and dirty. However, the arm pieces 3612 break on touch! Are they simply a bad, too thin, design, or is there something more ...
user avatar
  • 181
3 votes
2 answers
551 views

EV3 brick not turning on, nothing on display?

Ev3 brick not turning on, nothing on display, just red leds are on, tried 3 buttons not working.
user avatar
13 votes
6 answers
6k views

Minifigure Hand broken and stuck in arm

A friend of mine gave me some of his old minifigures. As you guys can see, the hand of one of the figures is broken and a part of the hand is stuck in the arm. Do you have any ideas how to remove the ...
user avatar
  • 131
3 votes
1 answer
271 views

How to safely straighten 2569 Lego Antenna Whip 8H?

I have one of those, in trans-neon green, that's slightly bent. I don't want to break it or make it opaque. Is there a way to make it straight again without risk? Preferably universal way, but way ...
user avatar
  • 1,389
8 votes
1 answer
677 views

Why do LEGO parts break?

I disassembled the Airplane set 7893 with normal pressure on the bricks and it happened that some parts broke like dry brittle leaves, see picture. The storage conditions have been in the open and ...
user avatar
  • 1,245
8 votes
2 answers
1k views

How can I repair a red 12v train motor from Set# 7730?

I have a LEGO 7865 Red 12 volt train motor from a LEGO 7730 train set. The motor has stopped working as it has been dropped on one of the wheels. How can I open the motor case to effect a repair?
user avatar
  • 81
6 votes
2 answers
684 views

How to fix the 4.3V output supply of a NXT 2.0?

I have a Mindstorm NXT 2.0 from 2007 (PCB code: 62115.40H) at which the sensors except the simple "Touch sensor" are no longer working. Also the tacho-signal of the motors do no longer work. (The ...
user avatar
  • 131
6 votes
1 answer
158 views

Lubricating 4.5V 6216m2 engine

Is there any way to lubricate old 4.5V 6216m2 engines (these grey round ones)? I have 2 from my childhood, and they still run, but have trouble starting and make an awful 'whining' sound from time to ...
user avatar
  • 183
4 votes
1 answer
2k views

Is it possible to fix a broken EV3 Port?

I have an EV3 running RobotC version 4.55. The medium motor connected to Port A does not run, but if I connect it to another port (B,C,or D) it works. I tested it manually through the EV3 motor tab ...
user avatar
  • 41
4 votes
1 answer
6k views

How to open Duplo train base 2961b?

How can I open a Duplo train base 2961b without destroying it? It is not working despite fresh batteries. There are no screws.
user avatar
  • 143
3 votes
1 answer
1k views

Is it possible to repair LEGO box creases?

Has anyone tried ironing or flattening a creased lego box to diminish the appearance of the damage?
user avatar
2 votes
1 answer
1k views

Unable to turn on NXT. Completely Frozen [closed]

I recently downloaded a file on my NXT and when I used it, it didn't work as intended. The motors started to make sounds like they were jammed, one got stuck and now the NXT won't even turn on. I ...
user avatar
  • 21
3 votes
1 answer
942 views

Lego 12v motor axle repair

I had recently got my Lego 7730 for past Christmas and wanted to use it. I bought the Lego 7864 and went to test the red motor but all I heard was the motor and it didn't move. I decided to take a ...
user avatar
2 votes
1 answer
397 views

Dan I open/repair this Duplo pullback motor?

My son has a Duplo pullback motor. This motor does not work well. After pull back it moves forwards 2 and a half wheel turns and stops. There is a small resistance forcing it forward two millimeters ...
user avatar
1 vote
0 answers
130 views

Does LEGO still exchange the Mindstorms NXT bricks with flicker problems? [duplicate]

I'm new here. Does LEGO still exchange the Mindstorms NXT bricks with flicker problems? If not, does anyone know of someone willing to try and fix them for a fee or barter?
user avatar
8 votes
3 answers
9k views

EV3 screen stuck at "Starting..."

After I turn the device on, its screen is stuck at "starting..." for a long time. It hasn't change into the regular screen, and the light behind the button was still red (didn't become green). Is ...
user avatar
  • 83
3 votes
1 answer
416 views

NXT Display is messed up

I have an NXT 1.0 and the LCD display only displays noise. Anyone know how to get one replaced or repaired?
user avatar
10 votes
4 answers
2k views

How to help a yellowed brick with a sticker?

My parents recently finally decided they can return me my childhood toys with 1990s Technic sets including the 8880 Super Car. All other sets were in boxes, but this one spent the last 15+ years ...
user avatar
3 votes
3 answers
2k views

How can I fix my chewed up LEGO head?

When I was about 8 I used to bite down on loose LEGO heads to "fix" them. Of course after the heads "treatment" they would have chew marks around the neck. Is there any way to make these marks less ...
user avatar