Rtc Trouble - LG GM200 Service Manual

4.15 RTC Trouble

TEST POINT
TP1
TP2
U103
Figure 4.15
CIRCUIT
TP1
3 2 7 .
E X X Y
TP2
LGE Internal Use Only
Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
X101
2 V 9 3 _
J T A G _ E N
C 1 4 9
2 2 p
H P M C I _ D E T _ 3 5 .
X 1 0 1 R 1 2 4
F C 1 - 3 5
6 8 K H z
1 0 M
0 0 1 8 7 0 1
C 1 5 2 V B A T
C
2 2 p
B A T T
C 1 5 4
0 1 . u
V B
C H
Wave form
V E X T
P A _ B A N D G I P O _
Y 7
G I P O _
U 8
S _ E N G I P O _
Y 8
S _ D A T A G I P O _
A B 6
S _ C L K G I P O _
K 1 2
G I P O _
A A 7
A B B _ N I T G I P O _
A B B _ N I T
Y 1
J T A G
F 2
T E S T
B 1 8
T E M P
A 1 8
T E M P
D 1 6
A U X A
B 1 7
A U X A
1 u
A 2 1
C 1 5 0
R E F
1 u
C 1 5 1 C 1 7
R E F O
A 7
O S C N I
A 8
O S C O
A 1 5
H G _ A B B V C H G
C 1 5
G A T E
B 1 6
S I E N S
A 1 7
V B A T
R 1 2 5 6 8 K 1 ( % )
D 1 9
R E F C
B 1 5
_ T E M P V A T T Y
C 2 0
T R K C
B 2 1
T R K C
A 1 6
U S _ U S B
V U S B
C 1 6
G _ A B B C H G D
G 2 0
C H G L
- 109 -
4. TROUBLE SHOOTING
F : 32.768KHz
7 0
7 1
7 2
7 3
7 4
7 6
7 8
E N
M O D E
1
2
D C 1
D C 2
U T
U T
D R V I E
E
S E N S E
H G
P E
H G 1
H G 2
C H G
E T
E D
LGE Internal Use Only
600mV
680mV