5-17
Flow chart of trouble shooting
5-10 Back Light
Yes
END
Backlight does not work
Select backlight "ON" mode
Backlight "ON" mode
in the menu?
Between R211 and R212 = "H"?
GPO1 by test S/W
No
Yes
Yes
No
Check the circuit related U112
LED209 Pin 1 3.3V?
LCD backlight on ?
Resolder LED209 or Check Q200
No
Yes
No
LCD BACKLIGHT
KEY PCB LED
Resolder R211, R212
Q200 pin 1 = "H" ?
No
Yes
Resolder Q200
Q200 pin 3 = "L" ?
No
Yes
Yes
END
Key PCB LED on ?
Resolder CN211
or Replace Key PCB
No
