Panel cable failure. This is the defect of this machine. Because the door is opened many times, the line will have a breakpoint. Sometimes pressing the line under the door by hand can make do, but it can't solve the problem fundamentally. Need replacement. One end is the junction box at the bottom of the machine, and the other end is in the screen. You need to pry open the plastic frame inside the door with a thin blade, fix it with a buckle, and open it to see the screws. Hands-on ability can be changed by itself, and after-sales can be informed if there are difficulties.

External screen

circuit board