The 3D printer screen is a surface area upon which text, graphics, and video are temporarily made to appear for human viewing. It is like a bridge between the printer and the users, we can only send the instructions to the printer through the screen.
However, sometimes we got issues with the screen and we can not control the test when the screen got something wrong. So the screen issue is kind of a tricky thing. In this article, I will show you some tips on how to check your printer when the screen failed.
Issue 1: Blue screen
When you encounter a situation like the one shown above, you need to understand that it may caused by the following reasons.
- The wiring for the screen did not connect well or somewhere is disconnected.
- The screen itself got something wrong.
- The mainboard issue caused this error.
How to fix it
- First, you have to check your wiring that related to the screen very carefully, disconnecting all the wiring and plugin them tightly again.
- Easy tips to determine if the screen is fine: To press the screen knob after 15 seconds of the printer power on. If there is a ticking sound, that means the screen is fine and you may need to find the issue on the mainboard. Otherwise, it is the screen itself broken.
- If the above two methods do not find the issues, then it should be the motherboard problem. Replace the mainboard is a quick way to address the issue.
Issue 2: Display garbled/jumping/page switching
Sometimes, the screen appears garbled, flashing, or page switching automatically. When we got such a situation, we will analyze it from 3 aspects:
- We will firstly suspect the electrostatic interference.
- The display itself did not pass the stress resistance testing.
- Motherboard issue.
How to fix it
- Remove the display from the printer and placed it on top of the table, and then heat the nozzle or hotbed to see if these issues still exist. If these issues disappeared, that means you found the issue, now you just have to fix the electrostatic interference. a) Try to replace the socket with a ground wire. b) Please try to use a wire, one end connected to the metal case of the machine, the other connected to a ground-conducting thing.
- If you take the display down, and the flashing still appears, it may be the display itself did not pass the stress resistance testing. You have to replace it with a new one.
- If the display pixels gradually disappear from left to right, followed by the machine dead, this is the main board failure, replace the motherboard.
Issue 3：The screen does not light up
When your screen does not light up at all and you can not do anything, do not worry! You only have to check if your screen failure or motherboard failure. The best way is to measure the voltage of the interface pins of the display (5V).
- If the voltage of the two pins is 5V, it is a screen problem. Replace it!
- If the voltage is not 5V, then the mainboard problem. Replace it!
Another method if you do not have a multimeter. Please connect the USB cable to the power supply to see if the screen lights up.
- If yes, then the screen is ok, the mainboard got something wrong.
- If no, then it is a screen problem.
Special case: BLtouch caused by the display does not light up
Please remove the BL-touch adapter board from the motherboard and connect the display port directly to the motherboard using the display cable. Then reboot the computer and see if the display can light up.
- If the display can light up, that BL-touch adapter board fails.
- If the display still can not light up. Then you need to go back to the step of checking the voltage of the pins of the display (5V). To use a multimeter to measure the voltage of the motherboard display port is 5V to make sure the screen is fine.
Alright, I think I have summarized all the issues and fix methods that you may meet on screen. If there is something missing or incorrect, please feel free to leave your comments and I will reply to them as soon as possible. Good luck and enjoy your printing life! Have a nice day to you all!