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9. 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
between main
PCB and control
panel PCB
Are the main PCB and
control panel PCB
connected properly?
No
Reconnect the connector
properly.
2
Harness
between main
PCB and control
panel PCB
Is the harness
damaged?
Yes
Replace the harness with a
normal one.
3
Connection
between main
PCB and PS
PCB unit
Are the main PCB and
PS PCB unit connected
properly?
No
Reconnect the connector
properly.
4
Harness
between main
PCB and PS
PCB unit
Is the harness
damaged?
Yes
Replace the harness with a
normal one.
5
LCD Is the problem solved
after replacing the LCD?
Yes
Replace the LCD.
6
Control panel
PCB
Is the problem solved
after replacing the
control panel PCB?
Yes
Replace the control panel
PCB.
7
PS PCB unit Is the problem solved
after replacing the PS
PCB unit?
Yes
Replace the PS PCB unit.
8
Main PCB Is the problem solved
after replacing the main
PCB ASSY?
Yes
Replace the main PCB
ASSY.