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5-9 Back Light
LCD BACKLIGHT
CN101
Pin 35, 36, 39, 40
LCD backlight on ?
END
SGH-N600 Flow chart of trouble shooting
Backlight does not work
Backlight "ON" mode
in the menu?
Yes
Between R139 and R141 = "H"?
Yes
No
3.3V?
Yes
No
Yes
Resolder R139, R141
Resolder Q101
Resolder CN102
or Replace Key PCB
No
Select backlight "ON" mode
No
GPO1 by test S/W
KEY PCB LED
Check the circuit related U100
Resolder LCD or Check Q101
No
No
No
Q101 pin 1 = "H" ?
Yes
Q101 pin 3 = "L" ?
Yes
Key PCB LED on ?
Yes
END
5-16
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