<p>I bought a new &quot;RepRap Discount Full Graphic Smart Controller&quot; for my printer. I'm having a hard time installing it. LCD wouldn't turn on and a ticking noise was getting out of the buzzer. It turned out that some have inverted sockets! So I scratched them to be used inverted. LCD turned on, rotary encoder, reset button, SD card and potentiometer and everything work but I get a quite scrambled show on LCD as it's shown in the picture.
I tried every possible combination of sockets (inverted and not) I don't know what is wrong!!!</p>
<p><a href="https://i.sstatic.net/W6szV.jpg" rel="nofollow noreferrer"><img src="https://i.sstatic.net/W6szV.jpg" alt="enter image description here" /></a></p>

CC BY-SA 4.0
2021-05-05T17:40:01.097Z
The content of your display is so close to the expected picture, that I would not suspect signal incompatibility or any internal issues related to shift register, etc. - but I don't know details of I2C. I was happy to make old Panelolu v1 working with Marlin 2, but it's easier to debug when each pin goes straight to Arduino. I don't know how to approach. Also you should consider that it could be provided broken or you could burn something as well with inverted plug. Did you try [any troubleshooting guide](https://www.instructables.com/Reprap-Full-Graphic-Smart-Discount-Controller/)?
octopus8
CC BY-SA 4.0
2021-05-06T19:05:43.437Z
I'm confused. That troubleshooting link didn't help.
2012User
<reprap><lcd-screen><full-graphic-smart-controller>
Problems with "Discount Full Graphic Smart Controller"!
2012User
# Problems with "Discount Full Graphic Smart Controller"!

(Asked by: username_0 on 2021-05-05)

I bought a new "RepRap Discount Full Graphic Smart Controller" for my printer. I'm having a hard time installing it. LCD wouldn't turn on and a ticking noise was getting out of the buzzer. It turned out that some have inverted sockets! So I scratched them to be used inverted. LCD turned on, rotary encoder, reset button, SD card and potentiometer and everything work but I get a quite scrambled show on LCD as it's shown in the picture.
I tried every possible combination of sockets (inverted and not) I don't know what is wrong!!!

[![enter image description here](https://i.sstatic.net/W6szV.jpg)](https://i.sstatic.net/W6szV.jpg)

**Tags:** reprap, lcd-screen, full-graphic-smart-controller
> **Comments:**
> **username_1**: The content of your display is so close to the expected picture, that I would not suspect signal incompatibility or any internal issues related to shift register, etc. - but I don't know details of I2C. I was happy to make old Panelolu v1 working with Marlin 2, but it's easier to debug when each pin goes straight to Arduino. I don't know how to approach. Also you should consider that it could be provided broken or you could burn something as well with inverted plug. Did you try [any troubleshooting guide](https://www.instructables.com/Reprap-Full-Graphic-Smart-Discount-Controller/)?  
> **username_0**: I'm confused. That troubleshooting link didn't help.  

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## 0 answers

