5-18
Flow Chart of Troubleshooting and Circuit Diagrams
5-10 Back Light
Yes
END
Backlight does not work
Select backlight "ON" mode
Backlight "ON" mode
in the menu?
R167 = "H" ?
GPO1 by test S/W
No
Yes
Yes
No
Resolder R167,R166
or replace Q107
Q107 pin 3 = "L" ?
LCD backlight on ?
Replace LCD
No
Yes
No
LCD BACKLIGHT
KEY PCB LED
Resolder R167,R166
or resolder Q107
Q107 pin 3 = "L" ?
No
Yes
Yes
END
Key PCB LED on ?
Resolder
R149,R118,R168,R184,
or Replace PBA
No