MK3S Stuck On Loading Screen With Fans On
When I switch my MK3S on it isn't booting, it's stuck on the "Original Prusa i3 Prusa Research ..." screen with fans running at full speed.
This seems to be intermittent, it happened a couple of weeks ago after working fine and not being switched off. After a few days of not powering the printer on it randomly worked again, so I did a firmware update just to be sensible and it worked fine for many prints.
It then happened again a few days ago, pressing and holding the X button (until the screen is filled with boxes) seemed to reset it and the printer went back to working properly.
I switched off the power and now it's happened again and the X button doesn't help now, though I get the boxes filling the screen again.
I tried to do a firmware update (FW 3.11), the Prusa MK3S is detected on my laptop on COM9, but when I try to update the firmware it fails saying "Could not open port: COM9".
I usually have the printer connected to a Raspberry Pi 4 with OctoPrint via USB-B cable, I have tested 2 cables, I checked the PSU and it's outputting 23.9V, I have re-seated the cables on the underside of the monitor module (one has a kink, but that's been like that forever), I have removed the SD card, I've tried many power cycles and tried factory resetting but it doesn't seem to register the command.
Does anyone have any suggestions for troubleshooting please?
Thanks in advance. 🙂
This sounds like a poor or intermittent connection somewhere. Try pulling and replugging all the plugs on the Einsy.
Cheerio,
RE: MK3S Stuck On Loading Screen With Fans On
Hi Diem,
Thanks for your help.
I swapped round the LCD cables, and it started working again, for about 24h printing from my OctoPrint server.
Then I did an update on my OctoPrint server and on reconnecting the printer (just telling to connect in software) it rebooted and the error is there again.
I tried reseating the LCD cables again, to no effect.
I bought a new cable for the LCD, but when it arrived it's wired with one plug in reverse, so I'm buying from elsewhere.
I tried reseating all cables on the Einsy board, and again it booted, plugged the USB back into the Raspberry Pi, started the connection (in software) and again the printer tries to reboot and errors out.
I hope it is a loose connection, ideally just a dodgy LCD cable as I have spares coming, but I can't see why that would cause an issue when I'm simply telling OctoPrint to connect to the printer while I'm in another room. It's done it at that exact instant of connection, where the board is meant to restart.
Do you have any more thoughts?
To simpify the issue temporarily remove the Pi and try using the machine standalone.
I doubt that Octoprint is at fault but this way you may be present when it glitches. Try to notice, has the machine moved at all before the freeze? Even a twitch makes a difference, if the issue only arises with movement then a work hardened wire in the extruder cable bundle becomes the next suspect.
Cheerio,