Loosen and remove the four screws on the bottom cover by using a Phillips screwdriver
Unplug the UV lamp power cord and remove the bottom shell.
(Note: Do not tear the UV lamp power cord when removing the bottom shell.)
Take a picture of the cable . Remove the cable. Loosen the two screws, and take out the mainboard and touchscreen
Loosen the three screws on the mainboard, remove it, and replace it with a new one.
Tighten the three screws to secure the mainboard.
Connect the cable to the mainboard and fasten the two screws.
Install the bottom shell back on the machine, connect the UV lamp power cord, and tighten the four screws of the bottom shell.