5-16
Flow chart of trouble shooting
5-9 Back Light
Yes
END
Backlight does not work
Select backlight "ON" mode
Backlight "ON" mode
in the menu?
Between R215 and R217 = "H"?
GPO1 by test S/W
No
Yes
Yes
No
Check the circuit related U100
Pin 35, 36, 39, 40 3.3V?
LCD backlight on ?
Resolder LCD or Check Q201
No
Yes
No
LCD BACKLIGHT
KEY PCB LED
Resolder R215, R217
Q201 pin 1 = "H" ?
No
Yes
Resolder Q201
Q201 pin 3 = "L" ?
No
Yes
Yes
END
Key PCB LED on ?
Resolder CN211
or Replace Key PCB
No
CN200
