Phase 1: Accessing the Control Board
Open the Machine: Use your keys to unlock the main door.
Remove the Internal Panel: Locate the protective panel on the back of the door. Use a screwdriver to remove the screws and set the panel aside to reveal the internal electronics.
Phase 2: Identifying the Touchscreen Connection
Locate the Android Board: Look for the red circuit board—this is the main Android board. It is easily identified by the cooling fan mounted on it.
Inspect the USB Connection: Find the USB cable plugged into the board. This specific cable connects the board to the touchscreen.
Check for Damage: Gently wiggle the cable. If the port feels loose, "wiggly," or the connection feels unstable, the port may be damaged, which causes the touch unresponsiveness.
Phase 3: Relocating the Cable
Switch USB Ports: Unplug the touchscreen cable from its current port.
Re-insert into a New Port: Plug the cable into the empty USB port directly beside the original one. Ensure it clicks in firmly and does not wiggle.
Test the Screen: Power on or wake the machine to confirm the touchscreen is now responding to your touch.