When powering on the printer, the touchscreen cannot turn on
The fuse fails to work.
Note:


The connection cable of the touchscreen is damaged.
Follow the instructions to confirm if the cable is damaged.





The touchscreen and its connection cable are damaged.
Follow the instructions to confirm if the touchscreen and its connection cable are damaged.

If the indicator of the motherboard is on, replace the old touchscreen and its connection cable with new ones.
How to Replace the Connection Cable of the Touchscreen
If the indicator of the motherboard is off, go to Cause 4 to troubleshoot the issue.
The power or the motherboard is damaged.
Observe if the indicator of the power is on.
WARNING: The bottom cover has been opened, do not touch the component area after turning on the power. Otherwise, you may receive an electric shock.

If the indicator of the power is on, replace the old motherboard with a new one.
How to Replace the Motherboard
If the indicator of the power is off, replace the old power with a new one.
How to Replace the Power