Bambu Lab X1E AP/TH Board Troubleshooting

Issue:

Hotend temperature registering a non-normal value (0, 236c while ambient, +300c or any abnormal reading while idle when compared to the other temperature values)
Swapping out the hotend assembly does not resolve the temperature issue.
Micro Lidar is offline HMS_0C00-0100-0001-0001
Toolhead is malfunctioning HMS_0500-0300-0001-0002

Cause:

AP and/or TH board is damaged and needs replacement
AP board was just replaced and the printer has not been registered with Bambu or flashed with new firmware.
- If the printer is not flashed with new firmware, the AP and TH boards will not communicate to each other and maintain the same issues as before.
- In order to get the printer to flash new firmware, it has to be connected to the internet and the new Serial Number and machine QR (Frame Serial number) need to be sent to Bambu to register on their cloud system.

Diagnosis:

Inspect the AP board:

Use this guide to remove the AP board and check the back side https://wiki.bambulab.com/en/x1/maintenance/replace-ap-board

Check the back of the AP board for damage, the capacitors can burn up during a hotend Hot-swap or print head flood.

Check the AP board for the two LED's, one blinking, one solid light.

Check the back of the AP board for damage, the capacitors can burn up during a hotend Hot-swap or print head flood.

Solution:

Replace AP board or TH board of the machine. Here is the guides for replacing both boards,