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5-10 Back Light
LCD BACKLIGHT
U620 pin 3 = "L" ?
Yes
LCD backlight on ?
Yes
END
5-18
Backlight does not work
Backlight "ON" mode
in the menu?
Yes
R575 = "H" ?
Yes
No
No
Resolder R575,R579
or resolder U625
Resolder
R747, R572, R748, R749,
R574, R750, R725, U619 or
Replace PBA
No
Select backlight "ON" mode
No
GPO1 by test S/W
KEY PCB LED
Resolder R575,R579
or replace U620
Replace LCD
No
No
SGH-N500 Flow Chart of Troubleshooting and Circuit Diagrams
U620 pin 3 = "L" ?
Yes
Key PCB LED on ?
Yes
END
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