LEGO Mindstorms NXT Brick Screen Replacement
tayola and 2 other contributors
Last updated on Apr 14, 2025
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Introduction
Go to step 1 ↓NOTE: I made this duplicate guide because the other guide, which was made in a different language, did not allow me to move it under LEGO.
What you need
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This guide is for NXT bricks that have blank or flickering or dim LCD screens or dead areas.
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Your brick should power up as normal - making the opening 'chime' and the usual button-press noises, but have issues with the screen - if you are getting nothing at all (check the batteries!) or a very quiet steady clicking noise it is probably a firmware problem so try and update or fix that first.
Ask FixBot
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Undo four small cross heads under the batteries and remove the pale grey front cover.
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Undo two small cross heads either side of the screen.
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Very gently pry the speaker away from the white plastic case. It is held with a sticky foam pad.
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Move the speaker and its wires aside and cut a small channel in the plastic to allow the cables to pass through. TAKE CARE NOT TO CUT THE CABLES.
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Unplug the 10 pin connector and lift out the screen/pcb assembly.
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lift the pcb from the bottom and slide it out and away so the ribbon cable is opened out and fully visible.
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I protected the LCD screen itself with a silicon baking mould (not sure if that was necessary!) Heat the part of the ribbon cable that attaches to the pcb. I gave it 10 secs with a small heat gun.
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Apply pressure to the area - You want to avoid puncturing the shiny protective cover-tape but to compress and hopefully re-connect the tiny terminals underneath. There are about ten of them, so i used the sharp end of a spudger and rubbed back and forth parallel to the ribbon
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Re-fold the ribbon cable under the screen and replace the PCB just enough to be able to re-insert the 10 pin connector. put some batteries in and test the screen.
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Repeat step 5 if necessary with more heat or pressure.
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Remember to thread the speaker cable back through the channel you cut and carefully re-stick it to the white plastic housing. Be careful not to put pressure on the face of the speaker - delicate)
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To reassemble your device, follow these instructions in reverse order.
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