Samsung SGH-i300 Service Manual page 19

2-10. Backlight Part
Backlight does not work
Yes
Backlight "ON" mode
in the menu
Yes
Check the
Pin 24 of CN501
is high
Yes
Check the
connection
from CN501
Yes
LCD backlight on?
Yes
END
VBAT
LCD_PWM
C527
C526
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SGH-I300 Flow Chart of Troubleshooting and Circuit Diagrams
U501
L501
6
SW VOUT
5
VIN
R502
4
CTRL
C528
R509
SAMSUNG Proprietary-Contents may change without notice
No
Select backlight
"ON" mode
No
Check the U501
No
Check the R502
No
Replace LCD module
1
2
GND
3
FB
C529
2-16
C530 C531 R503
LED+ 12V
LED-