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