[BFW-5600] [BUG] Flashing screen on MINI 5.1.0 alpha

[Erik262]

Printer type - MINI

Printer firmware version - original

Original or Custom firmware - 5.1.0 alpha

Optional upgrades - Filament Runout Sensor

USB drive or USB/Octoprint
USB and also same happens via PrusaConnect

Describe the bug
Right after the Warning message about Alpha Firmware, the whole screen keeps refreshing every 3 second

How to reproduce
This error happened right after flashing the alpha firmware

Expected behavior
No permanent flashing screen UI

G-code
Not necessary

Crash dump file
The printer keeps printing fine without any issues.

Video
https://github.com/prusa3d/Prusa-Firmware-Buddy/assets/11977647/d3cedbca-3a62-4501-be4d-6dd3035e3af1

[diminDDL]

I have the exact same issue. I believe it's a signal integrity issue, as I have scoped out the data lines during the bootloader/alpha firmware warning screens (when this issue is not present) and then the main home screen.

Boot screen signals:

Boot screen signals, zoomed in:

Home screen signals:

Home screen signals, zoomed in:

Home screen signals, zoomed in (different section):

As can be seen above, the display updates during the boot screen phase all have pretty good edges no overshoots and in general you can clearly see a digital signal there. The home screen updates show a very ringy and triangular looking signal. So it appears that during an effort to either increase the screen refresh rate or while porting from a different display, some clocking settings have been set slightly too high where it works fine on some machine, but breaks on certain others.

[Ferrugius]

Same here.

VID_20230919_191231.mp4

[D3nkis]

Hi folks, the issue is same.

[PhilippeGalid]

Hi after Update to MINI 5.1.0 alpha Firmware i have the same problem, Flashing Screen, i go now back to the old Firmware

[crazy-hair]

Same here. Printer seems to operate normally other than the fact that it constantly refreshes the screen. It's interesting how it doesn't happen in certain menus, like the z adjust or the alpha warning.

[R4ynor]

I have the same problem, but in my case when a motor is running I can here it glitching. The worst case is the extruder motor:

Mini_Alpha.mp4

[Lino77]

I have this problem only on the display, 3.2" and on the 2.8"from Fysetec. On the 2 original from Prusa LDO A01 and A03 that I have and one from Bigtreetech I do not have this problem.

[CuriousTimo]

So @R4ynor seems to be running an original Prusa Mini.
But are the others running an original printer or a Fysetc clone? And if it's a clone, what screen? The 3.2" or 2.4"?

[fabry-68]

I have the same problem on 2 x Fysetc clones with 3.2" LCD.

[ZeekWorld]

Same, Fysetc 3.2".

[Audiard-Jerome]

Same, Fystec 2.8"

[Ferrugius]

Fysetc 3.2" here.

[CuriousTimo]

So it looks like this issue is mainly seen on Fysetc displays.

@R4ynor I can see that your X-axis is using a Prusa Stepper motor. Are you running a replacement Fysetc display? Or is there anything else special our your Mini? Is it an original Prusa Mini?

• If for instance, you are running a replacement display or buddy board by Fysetc we can narrow the issue down.

• Since this issue was not there on the older firmware I'm wondering if there are changes in the code related to the st7789 display. Or are we maybe looking at an SPI related issue that the Fysetc display is venerable to?