Sunlu/4.2.7 MCU unable to connect

General Discussion
1

Basic Information:

Printer Model: sunlu s8 with ender 4.2.7 mainboard and factory spliced z cable
MCU / Printerboard: 4.2.7
klippy.log
klippy (14).log (90.6 KB)]

Fill out above information and in all cases attach your klippy.log file. Pasting your printer.cfg is not needed
When pasting code or config snippets use the code tags </> in the menu above

Describe your issue:

flashed the sd card twice same problem.
used the same file to flash another sd card last week and it worked.

2

So it’s to assume the first SD card is broken?

3

i tried a different sd card with same file flashed to it…same error msg…
klippy (16).log (33.2 KB)

4

This error message generally means that the Klipper Host cannot establish any connection with the board (as if the board was not even connected). Could be:

  • Not correctly build firmware, e.g. wrong settings in make menuconfig
  • Not flashed correctly
  • Hardware issue with respect to the USB port / cable
  • Dead board
5

tried multiple “known good” usb’s
multiple “known good” sc cards and flashes
not sure what firmware build is but the other three ender 4.2.7’s that i have cloned this way work.
the baord is new but unknown
how can i test the board?

6

suddenly i can connect but there are no config files and i cant drag and drop anything into the list
klippy (19).log (277.3 KB)
moonraker (3).log (79.7 KB)

7

If Marlin is still on it, you can try Pronterface on your PC

8

klipper only
i got connected but when i updated the permision policy kit,
i lost all the config files and i cant move anything into the empty list