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Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
4. TROUBLE SHOOTING
1) Measurement :Main-U502, U503
-. +VPWR : 4V (C505)
-. VREG_MSMP_2.6V : 2.6V (C509)
-. BL_I2C_SDA / SCL : data / CLK pulse (R508, R509)
-. U503 (GC1 / GC2) : data pulse
BL_I2C_SDA (R509)
BL_I2C_SCL (R508)
VREG_MSMP_2.6V (C509)
+VPWR (C505)
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