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Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
3. TECHNICAL BRIEF
3.2.7 LCD Backlight Illumination
There are 5 white LEDs in LCD Backlight circuit which is driven SUB PMIC(BD6095).I2C is
used for Backlight brightness control.
3.2.8 Keypad Illumination
There are 2 WHITE LEDs in Main board backlight circuit, which are driven by
LEDC port in ABB
and light guide is used for luminance Uniformity
Figure 3-2-10. Keypad Backlight LED Interface and Backlight Circuit
Figure 3-2-9. SUB PMIC Circuit LCD Backlight
C503
1u
SSENS
F3
A1
T1
A6
T2
T3
F6
F1
T4
F4
VBAT1
VBATCP
B5
VBATLDO
E1
E6
VIO
B4
VOUT
WPWMIN
D1
GC1
E4
E3
GC2
LDO1O
F2
LDO2O
E2
D2
LED1
C2
LED2
LED3
C1
LED4
B1
LED5
B2
A2
LEDFL
B3
LEDGND
RESETB
C4
SBIAS
F5
D5
SCL
D4
SDA
E5
SGND
BD6095GUL
U502
C1N
D6
C5
C1P
C6
C2N
C2P
B6
C3N
A4
C3P
A5
A3
CPGND
FLASHCNT
D3
10u
C501
D501
RB521CS-30
0.1u
C505
TP504
VBAT
VDD_VGA_1V8
C509
1u
1u
C506
VDD_VGA_2V8
VDDE_1V8
C508
1u
RB521CS-30
2.2u
D502
C502
C504
1u
APP_GP_SUBPM_RST
APP_GP_SUBPM_SCL
APP_GP_SUBPM_SDA
SENS
WLED_PWR
LCD_PWM
GAIN1
GAIN2
WLED1
WLED2
WLED3
WLED4
WLED5
SBIAS
100ohm
R102
LD102
SSC-SWTS1007
A
1
C
2
R101
100ohm
VB
A
T
ZD101
RSB6.8CST2R
RSB6.8CST2R
ZD102
A
1
C
2
SSC-SWTS1007
LD101
KEY_LED2
KEY_LED1