Before replacing the mainboard, it is important to thoroughly troubleshoot the problem to ensure that it's the source of the issue.

Normally, the mainboard produces a short beep about 10 seconds after powerup. If it doesn't beep, then it's probably dead.

If the printer produces multiple or repeated beeps, it is a sign that the mainboard is likely functional, but there may be another component that has failed, such as a dead CMOS battery or bad memory.

Refer to Step 8 for further diagnosis.

Another indication is the front display: if the backlight works but all pixels remain black (as shown in the photo), it may indicate that the mainboard is dead. If the display does not light up at all, it may suggest a different issue, such as a dead power supply for the electronics module.