Brother MFC-9840CDW, DCP-9045CDN 8.TROUBLESHOOTING OF THE CONTROL PANEL, Nothing is displayed on the LCD

8.TROUBLESHOOTING OF THE CONTROL PANEL

Nothing is displayed on the LCD.

User Check

- Verify if the power switch is turned off.

Step	Possible cause	Check	Result	Remedy
1	Connection	Are the main PCB and	No	Reconnect the connector
	between main	control panel PCB		properly.
	PCB and control	connected properly?
	panel PCB
2	Harness between	Is the harness damaged?	Yes	Replace the harness with
	main PCB and			a normal one.
	control panel PCB
3	Connection	Are the main PCB and PS	No	Reconnect the connector
	between main	PCB unit connected		properly.
	PCB and PS PCB	properly?
	unit
4	Harness between	Is the harness damaged?	Yes	Replace the harness with
	main PCB and PS			a normal one.
	PCB unit
5	LCD	Is the problem solved	Yes	Replace the LCD.
		after replacing the LCD?
6	Control panel	Is the problem solved	Yes	Replace the control panel
	PCB	after replacing the control		PCB.
		panel PCB?
7	PS PCB unit	Is the problem solved	Yes	Replace the PS PCB unit.
		after replacing the PS
		PCB unit?
8	Main PCB	Is the problem solved	Yes	Replace the main PCB
		after replacing the main		ASSY.
		PCB ASSY?

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