Prusa MK3S won't start, flickering LCD
Hello! I bought my MK3S last summer, put a good couple hundred hours of printing on it, at least, never had a problem, been extremely satisfied. However, this weekend, I went to update the firmware, Slicer told me the flash failed, and ever since, I've been having this flickering LCD issue that can be seen in the following YT video:
I was at one point able to initiate a factory reset, but I don't know if that ever finished because it still just does this.
My printer's currently unusable in this state, so I'd love some help getting it back up and running. Thanks!
RE: Prusa MK3S won't start, flickering LCD
Hi Dstarr3
Have you spoken to the Prusa Chat team?
it appears at the bottom right hand corner of this page
https://shop.prusa3d.com/en/
about 5 seconds after the page displays
regards Joan
I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility. Location Halifax UK
RE: Prusa MK3S won't start, flickering LCD
Probably another case of https://github.com/prusa3d/Prusa-Firmware/issues/2954 . You can go back to 3.9.2, this should work. It would be nice if you also comment at that Github issue (so the developers know about it).
RE: Prusa MK3S won't start, flickering LCD
Appears to be the case. An update: It took about an hour and a half of bootlooping, but my printer eventually booted up. Once that happened, I was able to flash 3.9.1 (last known working for me). Then because I'd attempted a factory reset prior, I went through the first-time calibration steps, etc. Everything was fine. Then I tried flashing up to 3.9.3 again and got the error and bootlooping again. So then I tried flashing 3.9.1 once more and PrusaSlicer said that it failed, but my printer booted up just fine and shows firmware 3.9.1. Printing now, seems fine.
I guess I'll try flashing 3.9.2 tomorrow, see how that works. And I'll bump that github issue with details so they know what's going on.
Thanks, all! I was worried this was an Einsy or power supply issue, so I'm at least relieved to learn it's just firmware and not hardware.
RE: Prusa MK3S won't start, flickering LCD
You can flash an older firmware even with the board in the boot loop. From the discussion at the GH issue it _might_ be something with the board, but there is no clear idea yet.