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5-18
Flow Chart of Troubleshooting
5-10 Back Light
Yes
END
Backlight does not work
Select backlight "ON" mode
Backlight "ON" mode
in the menu?
R141,R179 = "H" ?
GPO1 by test S/W
No
Yes
Yes
No
ResolderR141,R149,R139,R145,R148
or replace Q107
Q107 pin 3 = "L" ?
LCD backlight on ?
Replace LCD
No
Yes
No
LCD BACKLIGHT
EL_Backlight
Resolder R179,C199
U121 pin 5 = "H" ?
No
Yes
Yes
END
U121 pin 4 = 3.3V
Resolder U122,C200,C196
No
U121 pin 7 = 150V
Resolder L103,Q110
No
Is it working
Replace LCD
No
Summary of Contents for SGH-N300
Page 2: ...Samsung Electronics Co Ltd Printed in Korea 06 2001 Rev 1 0 GH68 02097A ELECTRONICS ...
Page 11: ...Exploded Views and Parts List 1 8 1 10 Desk Top Charger DESK TOP CHARGER GH44 00206A ...
Page 12: ...2 1 PCB Diagrams Schematic Diagrams 2 PCB Diagrams 2 1 Main Top ...
Page 13: ...2 2 PCB Diagrams Schematic Diagrams 2 2 Main Bottom ...
Page 41: ...Flow Chart of Troubleshooting 5 12 J101 SPK101 U110 PWO1P PWO1N SPK SPK 6 2 3 SPK SPK ...