Brother MFC-J6935DW - Control Panel Problems; No Display on Lcd;Incorrect Display on LCD; No Display on LED; The Control Panel Does Not Work

Confidential
2-78
4.6 Control Panel Problems
4.6.1 No display on LCD/Incorrect display on LCD
4.6.2 No display on LED
4.6.3 The control panel does not work
Step
Cause Solution
1 Panel flat cable connection
failure
Reconnect the panel flat cable.
2 LCD flat cable connection
failure
Reconnect the LCD flat cable.
3 Breakage of panel flat cable Replace the panel flat cable.
4 LCD PCB defective Replace the LCD PCB.
5 LCD defective Replace the LCD ASSY.
6 Control panel ASSY defective Replace the control panel ASSY.
7 AC cord ASSY or power
supply PCB defective
Replace the AC cord ASSY or power supply
PCB ASSY.
8 Main PCB defective Replace the main PCB.
Step
Cause Solution
1 Panel flat cable connection
failure
Reconnect the panel flat cable.
2 Breakage of panel flat cable Replace the panel flat cable.
3 Panel PCB defective Replace the panel PCB ASSY.
4 LCD PCB defective Replace the LCD PCB.
5 Control panel ASSY defective Replace the control panel ASSY.
6 AC cord ASSY or power
supply PCB defective
Replace the AC cord ASSY or power supply
PCB ASSY.
7 Main PCB defective Replace the main PCB.
Step
Cause Solution
1 Panel flat cable connection
failure
Reconnect the panel flat cable.
2 Panel PCB defective Replace the panel PCB ASSY.
3 LCD PCB defective Replace the LCD PCB.
4 Key defective Replace the control panel ASSY.
5 Main PCB defective Replace the main PCB.