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Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
3. Technical Brief
When ALC sensor turn on, automatically controls brightness of the display backlight.
U502 : Backlight driver IC (BD6083) used I2C interface to MSM7200A
U503 : Luminance Sensor
3.16 Luminance Sensor
Luminance Sensor Schematic
Luminance Sensor Block Diagram
MSM7200A
U503
U502
(BD6083GUL)
ALS(BH1621FVC)
0
1
0
5
R
u
7
.
4
5
0
5
C
100K
R5
0
3
u
1
0
2
5
C
8
0
5
C
u
1
4.7k
R5
0
8
4.7k
R5
0
9
u
1
9
0
5
C
V
6
.
2
_
P
M
S
M
_
G
E
R
V
R
W
P
V
+
E
V
L
C
5S
0250
V
A
5
04
L
U
G
3
8
0
6
D
B
2
0
5
U
A3
F6
A1
F1
A6
3
E
2
E
4
E
3
D
5
E
2
F
6
E
1
E
3
F
1
C
3
B
2
D
4
D
1
D
4
C
2
C
4
B
2
B
5
D
1
B
2
A
5
F
4
F
6
D
6
B
A5
C6
B5
C5
A4
C1
N
C1
P
C2
N
C2
P
CP
G
N
D
P
C
T
A
B
V
T
U
O
V
1
T
A
B
V
2
T
A
B
V
1
D
E
L
2
D
E
L
O
I
V
3
D
E
L
B
T
E
S
E
R
4
D
E
L
L
C
S
5
D
E
L
A
D
S
6
D
E
L
N
I
M
W
P
W
D
N
G
D
E
L
S
A
I
B
S
S
N
E
S
S
O
1
O
D
L
D
N
G
S
O
2
O
D
L
2
C
G
O
3
O
D
L
1
C
G
O
4
O
D
L
T2
T4
T1
T3
G
ND1
E
V
L
C
5S
0250
V
A
5
06
C5
1
8
1
u
1u
C5
1
9
VA
5
0
7
E
V
L
C
5S
0250
V
8
.
2
_
D
D
V
A
_
A
G
V
u
1
1
2
5
C
u
1
2
2
5
C
V
8
.
1
_
D
D
V
D
_
A
G
V
V
8
.
2
_
F
A
_
M
A
C
_
M
P
E
V
L
C
5S
0250
V
A
5
09
E
V
L
C
5S
0250
V
A
5
10
9
0
9
0
0
0
0
H
B
F
S
5
0
5
B
F
3
0
5
U
1
0
2
8
8
3
0
Y
S
U
E
C
V
F
1
2
6
1
H
B
6
4
3
2
5
1
C
C
V
T
U
O
I
1
D
N
G
1
C
G
2
C
G
GN
D
2
V
8
.
2
_
D
D
V
O
I
_
A
G
V
u
1
8
2
5
C
E
V
L
C
5S
0250
V
A
5
11
K
0
1
2
0
5
R
L
C
S
_
C
2
I
_
L
B
A
D
S
_
C
2
I
_
L
B
N
E
_
L
B
_
D
C
L
P
_
A
T
A
D
_
P
_
I
D
D
M
M
_
A
T
A
D
_
P
_
I
D
D
M
P
_
B
T
S
_
P
_
I
D
D
M
M
_
B
T
S
_
P
_
I
D
D
M
2
D
E
L
W
3
D
E
L
W
4
D
E
L
W
6
D
E
L
W
R
W
P
_
D
E
L
W
5
D
E
L
W
1
D
E
L
W
M
W
P
_
D
C
L
r
o
s
n
e
S
e
c
n
a
n
i
m
u
L
P
M
U
P
E
G
R
A
H
C
T
H
G
I
L
K
C
A
B
D
C
L
d
e
t
e
l
e
d
0
.
1
.
v
e
R
B
v
e
R
B
v
e
R
2
1
8
0
9
0