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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
LGE Internal Use Only
4.15 RTC Trouble
TEST POINT
CIRCUIT
Figure 4.15
Wave form
U103
X101
TP1
TP2
F : 32.768KHz
600mV
680mV
(1%)
)
%
1
(
B
B
A
_
G
H
C
B
B
A
_
G
H
C
6
1
A
G
H
C
B
S
U
V
E
P
Y
T
T
A
V
5
1
B
E
S
N
E
S
T
A
B
V
7
1
A
G
H
C
V
5
1
A
0
2
C
1
G
H
C
K
R
T
2
G
H
C
K
R
T
1
2
B
8
1
B
1
P
M
E
T
2
P
M
E
T
8
1
A
2
F
E
D
O
M
T
S
E
T
1
2
A
F
E
R
G
H
C
F
E
R
9
1
D
T
U
O
F
E
R
7
1
C
N
I
C
S
O
7
A
8
A
T
U
O
C
S
O
6
1
B
E
S
N
E
S
I
N
E
G
A
T
J
1
Y
0
7
_
O
I
P
G
1
7
_
O
I
P
G
7
Y
8
U
2
7
_
O
I
P
G
8
Y
3
7
_
O
I
P
G
6
B
A
4
7
_
O
I
P
G
6
7
_
O
I
P
G
2
1
K
8
7
_
O
I
P
G
7
A
A
L9
GND2
GND3
M9
GND4
M10
R6
GND5
5
1
C
E
V
I
R
D
E
T
A
G
GND1
A1
6
1
C
T
E
D
G
H
C
0
2
G
D
E
L
G
H
C
6
1
D
1
C
D
A
X
U
A
2
C
D
A
X
U
A
7
1
B
p
2
2
9
4
1
C
0
5
1
C
u
1
u
1
.
0
4
5
1
C
M
0
1
4
2
1
R
R122
1K
N
E
_
G
A
T
J
T
N
I
_
B
B
A
T
X
E
V
_
3
9
V
2
B
S
U
_
S
U
B
V
K
8
6
5
2
1
R
120K
R128
5
3
1
-
C
F
1
2
z
H
K
8
6
7
.
2
3
1
0
1
X
1
0
7
8
1
0
0
Y
X
X
E
2
5
1
C
p
2
2
T
A
B
V
u
1
1
5
1
C
0.1u
C155
D
N
A
B
_
A
P
N
E
_
S
A
T
A
D
_
S
K
L
C
_
S
T
N
I
_
B
B
A
P
M
E
T
_
T
T
A
B
5
.
3
_
T
E
D
_
C
I
M
P
H
TP1
TP2