Screen flickering on prusa mk4s preassembled  

RE: Screen flickering on prusa mk4s preassembled

I've ordered my MK4S first day available and have had similar issue. Prusa support guided me to do some tests and finally send a replacement screen. 

RE: Screen flickering on prusa mk4s preassembled

Did the replacement screen fix the issue?

RE: Screen flickering on prusa mk4s preassembled

I’m having the same issue. It just started today after a few days of perfect operation. I checked all cables and connection plus tried to disturb them to replicate and fix the problem with no change. I wondering if its a hardware or firmware issues. Prusa any help with this? Thanks

RE: Screen flickering on prusa mk4s preassembled

Same issue - I just get the attached. After several restarts it works normally again.....

RE: Screen flickering on prusa mk4s preassembled

Have been asked by Prusa chat to apply the alpha firmware:

https://github.com/prusa3d/Prusa-Firmware-Buddy/releases/tag/v6.2.0-alpha1?utm_medium=chat&utm_campaign=link-shared-in-chat&utm_source=livechat.com&utm_content=www.prusa3d.com

RE: Screen flickering on prusa mk4s preassembled

Is this the same problem you all are having?

I built the printer from a kit roughly 5 days ago I think and it was great until today when I checked on a print via the prusa app on my phone. Came outside to remove the parts and found this. I was able to start a new print via connect.

I notice that when it reboots the boot screen is fine so I suspect the screen itself is fine and this is some sort of bug in the firmware (i really hope thats the case at least since i don't know if i have it in me to rebuild the printer right now after having just finished.)

Will let you all know if it resolves itself on its own.

RE: Screen flickering on prusa mk4s preassembled

FWIW i managed to get my screen working again by powering down the printer via the switch on the PSU, then unplugging the machine, then toggling the power switch back and fourth about 10 times. When it rebooted the screen came up like normal. Def thinking firmware bug and not hardware issue. Will trying playing with the app again to see if I can recreate it.

RE: Screen flickering on prusa mk4s preassembled

Same flickering issues led me to this thread.  

I just installed 6.2.0 alpha2 and flickering is gone.  

When I tried to print a gcode I sliced with MK4S profile, the printer warned me about 'nozzle not high flow'.  I simply re-enabled it in the menu (under hardware, it was disabled) , it's printing OK now.

RE: Screen flickering on prusa mk4s preassembled

Posted by: @eddieprints

Same flickering issues led me to this thread.  

I just installed 6.2.0 alpha2 and flickering is gone.  

When I tried to print a gcode I sliced with MK4S profile, the printer warned me about 'nozzle not high flow'.  I simply re-enabled it in the menu (under hardware, it was disabled) , it's printing OK now.

 

Exactly the same here - seems to be OK since the alpha firmware. And I had the same thing with the HF Nozzle message too 😉

RE: Screen flickering on prusa mk4s preassembled

Oh it's going bonkers now! lol

Still printing OK though, the screen is just posessed.

RE:

Only happened for me when initially switched on, not mid use - but apply the 6.2.0 firmware I linked to above - it seemed to fix the issue for me........

RE: Screen flickering on prusa mk4s preassembled

Mind got to a point where it was constantly screwed up, totally unusable screen.

Jumped on chat with Prusa Support a couple of days ago, we did a few tests and I sent over pics and videos of the screen and my wiring.  They're sending me a new screen and cable.  

RE: Screen flickering on prusa mk4s preassembled

New screen and cable arrived today.  

Only replaced the screen, and so far no flickering issues to report.  

I will keep an eye on it over the next few days and report back.

For anyone else having the same experience, please chat with Prusa Support, they are excellent help.

RE:

I have the same issue as you guys. It always happen when I start a print. The screen starts to flicker like crazy and then starts showing inverted images, squeezed image, noisy image and other artifacts. Simply pushing the "RESET"  button on the display panel instantly turns it back to normal and I can start a print no problem, so I recon it's not a faulty display, nor a loose connection.

Looking forward to the next firmware update which, hopefully, fixes this. Love the printer otherwise! 🙂

RE: Screen flickering on prusa mk4s preassembled

Hey there! Just had this issue as well, re-flashed the firmware and didn't do anything. I did however do something that made the issue go away. I believe it was in the Settings > Hardware > Screen Refresh Rate, changed it from High to Low. Didn't flicker anymore after that, might be useful to someone!

RE: Screen flickering on prusa mk4s preassembled

You saved my day, thank you

RE: Screen flickering on prusa mk4s preassembled

I've had the same problem twice. The first time was 3 days after I had assembled the printer (kit), about 3 months ago. The second time was just today. This time I  had shut the printer down due to a trip, and today I attempted to fire it up and print a model, only to see the bootloader and then a blank screen. Like the troubleshooting had gone the previous time, I disassembled the screen panel and attempted to re-sit the cables. It did not work and I contacted the support a second time. The waiting time was about 24 minutes, so in the meantime I attempted to shut the printer down from the PSU switch, and from the reset button more than 20 times. I even downloaded and installed the latest firmware (6.2.3 - March 25, 2025) but it did not solve the issue. As soon as the chat session started, the screen menu came up and I was able to navigate to a couple menus, but soon it would turn black again. Eventually, the support advised me I turn the Display Refresh Rate to Low (from the Hardware Settings) which I did, and after that the display has remained on and functional.