<p>I have solved completely, I covered the flat cable, with copper tape, this shield should be connected to the 0V of the power supply.
All disorders will disappear.</p>

CC BY-SA 4.0
2018-07-26T12:19:18.923Z
2018-07-26T12:19:18.923Z
Gianluca
<p>I had this issue for a long time and finally I tried a super-simple hack. Attach a testlead from bed to PSU (which is grounded). Problem solved!</p>

<p>In other words: The Marlin firmware may be more "sensitive" than the original stock firmware, but it is not really a firmware issue.</p>

<p><a href="https://i.sstatic.net/e3klX.jpg" rel="nofollow noreferrer"><img src="https://i.sstatic.net/e3klX.jpg" alt="enter image description here"></a></p>

CC BY-SA 4.0
2019-10-14T09:03:06.240Z
2019-10-14T11:17:45.093Z
2019-10-14T11:17:45.093Z
Jacob
<p>This is a known problem of the Anet A8 display, it is caused by electrical interference. Pressing the middle button will refresh the display.</p>

<p>This is prone to happen when doing long prints. </p>

<p>There are some reported successes of people inserting ferrite beads or toroidal rings. </p>

<p>No, this is not a firmware issue, this is a hardware issue.</p>

CC BY-SA 4.0
2018-07-05T00:09:10.547Z
My first though was about the Marlin because with the original firmware it never happened. So, I'm guessing now it was pure luck.
Pushing the middle button indeed refreshes the display, except for the first character, that remains messy.
elias
CC BY-SA 4.0
2018-07-05T03:15:04.043Z
Yes, this happens with unprotected shields and when we use a kind of polyester cloth and we are so close to the drivers. So be aware to avoid to use this kind of cloth, use cotton clothes.
Fernando Baltazar
CC BY-SA 4.0
2018-07-05T06:14:31.447Z
@Elias Maybe pulling the flat cable from the sockets and re-inserting the plugs helps. Also keep the flat ribbon cable away from the 12V wires.
0scar
CC BY-SA 4.0
2018-08-27T14:39:28.700Z
Worked for me! Easy fix, just used on old ferrite ring and looped the display wire through it!
Felix
CC BY-SA 4.0
2018-07-04T21:54:04.870Z
2018-07-04T22:19:44.327Z
2018-07-04T22:19:44.327Z
0scar
<p>I have an Anet A8, and recently updated the firmware to Marlin 1.1.8.
My only change was replacing the configuration files by the Anet A8 sample files built in with the firmware zip file.</p>

<p>Everything works fine but, sometimes, right after finishing a printing (while doing the "home all"), the LCD shows some weird data, like this:</p>

<p><a href="https://i.sstatic.net/8H1Vn.jpg" rel="nofollow noreferrer" title="LCD weird data"><img src="https://i.sstatic.net/8H1Vn.jpg" alt="LCD weird data" title="LCD weird data"></a></p>

<p>The same happens when push the "confirm", after the mesh bed leveling.<br>
I'd like to know why it happens. Is it a Marlin bug?</p>

CC BY-SA 4.0
2018-07-04T21:52:13.107Z
Welcome to 3D Printing! I take it you have to reset the printer in order to get it to clear?
Pᴀᴜʟsᴛᴇʀ2
CC BY-SA 4.0
2018-08-28T06:49:50.067Z
Just active the menu display, the best solution is to shield your shield, Gianluca has part of the solution
Fernando Baltazar
<marlin><anet-a8>
Anet A8 LCD shows garbage data after done printing
elias
# Anet A8 LCD shows garbage data after done printing

(Asked by: username_0 on 2018-07-04)

I have an Anet A8, and recently updated the firmware to Marlin 1.1.8.
My only change was replacing the configuration files by the Anet A8 sample files built in with the firmware zip file.

Everything works fine but, sometimes, right after finishing a printing (while doing the "home all"), the LCD shows some weird data, like this:

[![LCD weird data](https://i.sstatic.net/8H1Vn.jpg "LCD weird data")](https://i.sstatic.net/8H1Vn.jpg "LCD weird data")

The same happens when push the "confirm", after the mesh bed leveling.  
I'd like to know why it happens. Is it a Marlin bug?

**Tags:** marlin, anet-a8

> **Comments:**
> **username_1**: Welcome to 3D Printing! I take it you have to reset the printer in order to get it to clear?  
> **username_2**: Just active the menu display, the best solution is to shield your shield, username_3 has part of the solution  

---

## 3 answers

### Answer by username_5 on 2018-07-04. Score: 5 | Accepted answer

This is a known problem of the Anet A8 display, it is caused by electrical interference. Pressing the middle button will refresh the display.

This is prone to happen when doing long prints.

There are some reported successes of people inserting ferrite beads or toroidal rings.

No, this is not a firmware issue, this is a hardware issue.

> **Comments:**
> **username_0**: My first though was about the Marlin because with the original firmware it never happened. So, I'm guessing now it was pure luck. Pushing the middle button indeed refreshes the display, except for the first character, that remains messy.  
> **username_2**: Yes, this happens with unprotected shields and when we use a kind of polyester cloth and we are so close to the drivers. So be aware to avoid to use this kind of cloth, use cotton clothes.  
> **username_5**: @username_0 Maybe pulling the flat cable from the sockets and re-inserting the plugs helps. Also keep the flat ribbon cable away from the 12V wires.  
> **username_6**: Worked for me! Easy fix, just used on old ferrite ring and looped the display wire through it!  

---

### Answer by username_3 on 2018-07-26. Score: 4

I have solved completely, I covered the flat cable, with copper tape, this shield should be connected to the 0V of the power supply.
All disorders will disappear.


---

### Answer by username_4 on 2019-10-14. Score: 2

I had this issue for a long time and finally I tried a super-simple hack. Attach a testlead from bed to PSU (which is grounded). Problem solved!

In other words: The Marlin firmware may be more "sensitive" than the original stock firmware, but it is not really a firmware issue.

[![enter image description here](https://i.sstatic.net/e3klX.jpg)](https://i.sstatic.net/e3klX.jpg)


---

