Power On Trouble - LG KS660 Service Manual

4. TROUBLE SHOOTING

4.2. Power on Trouble

Check Points
-Battery Voltage( Need to over 3.35V)
-Power-On Key detection (PWRON signal)
-Outputs of LDOs from PMIC
R P W R O N _ E N
P M C I
U S B _ O E n
U S B _ D A T _ V P
U S B _ S E 0 _ V M
T X O N _ P A
1 V 8 _ S D 2 V 5 _ V A U D B V B A T
2 V 5 _ V A U D A 2 V 8 5 _ V F M
U _ R C V
U _ P M N I
U _ V M N I
I S M 1 _ U S B _ D P
I S M 1 _ U S B _ D M
P M R S T n
V C X O _ E N
I S M 1 _ B T _ V C X O _ E N
C 2 1 4 C 2 1 5 C 2 1 6
2 2 . u 2 2 . u 1 u
C 2 2 3
0 1 . u 1 0 u C 2 2 9 C
2 2 . u 0 1 .
C 2 2 1
LGE Internal Use Only
R e m o e t P o w
V B A T
U 2 0 2
1 3
V D D V O U T
4 2
N C G N D 1
R 2 2 4
6 5
C E G N D 2
1 0 0 K
R 1 1 1 4 D 2 8 1 D T - R F -
C 2 5 1 C 2 5 2
2 2 . u 0 1 . u
2 V 6 2 _
S 1 _ E X T R S T n
S P O W E R _ N I T
_ R E S E T
TP2
TP2
V U S B V B A T
V B A T
1 V 3
C 2 0 2 C 2 0 0
0 1 . u
2 2 . u
R 2 1 3 0
V B A T
B 1
R C V
C 2
V P N I
D 3
V M N I
C 1
D +
D 2
- D
P M R S T n
E 3
R E S E T _ N
D 1
R E S E T 2 _ N
E 2
S L E E P 1 _ N
E 1
S L E E P 2 _ N
R 2 1 8 0
F 2
V A U D O I A
F 1
V D D A U D O I A
G 2
V D D A U D O I B
G 1
V A U D O I B
H 2
V A U X
H 1
V D D A U X
1 J
S U 1 _ G A T E
2 J
S U 1 _ G N D
H 3
S U 1 _ F B
3 J
S U 1 _ S I E N S E
K 1
V D D S D 2
K 2
S D 2 _ F B
L 2
S D 2 _ F B L
2 3 0 C 2 3 1
u 2 2 . u
r e O n
R 2 2 1
I S M 2 _ R P W R O N
1 K
1 0 0 K
R 2 2 3
C 2 4 9 C 2 5 0
0 1 . u 2 2 . u
E N D
V O I 2 V 1 1 _ R T C
7 8
A 1 V C C
6 1
B 1 Y 1
5 2
Y 2 B 2
4 3
G N D A 2
C 2 6 8
U 2 0 7
0 1 . u
N C 7 W Z 0 8 L 8 X
K D
3
D
2 V 6 2 _ V O I
C 2 0 1
2 2 . u
5 _ V P L L 2 V 6 2 _ V O I
V B A T
V B A T V B A T
T P 2 0 1
V D
U 2 0 1
P M B 6 8 2 1
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TP1
2 V 1 1 _ R T C
TP1
P W R O N
1 2 3
Q 2 0 0
E M X 1 8
6 5 4
_ K E Y _ N I
P M _ N I T
P M R S T n
R 3 3 1 V
V C H G _ O V P
2
S G 3 _ V B U S _ O V P
1
2 0 0
R T C _ O U T
C 2 0 4
1 0 0 u
2 V 8 _ C O D E C
1 0 u H
L 2 0 0 1 V 3 5 _ C O R E 2 V 7 _ V R F 2 V 8 5 _ V R
V B A T 1 V 5 _ V B T 2 V 1 1 _ R T C 2 V 9 _ I S M
C 1 1
V M M E
C 1 0
V D D M M E
D 1 0
V D D R F 2
D 1 1
V R F 2
E 1 0
V R F 3
E 1 1
D R F 1 3 _ A F C
F 1 0
V R F 1
F 1 1
V V B I
G 1 1
V D D I S M V B I
G 1 0
V I S M
H 1 1
V A F C
H 1 0
V R T C
H 9
V D D U M T S
1 J 1
V U M T S
F B 2 0 1
K 1 1
V D D S D 1
1 J 0
S D 1 _ F B
L 1 0
S D 1 _ F B L
1 0 u C 2 3 2 C 2 3 3 C 2 3 4 C 2 3 5 C 2 3 6 C 2 3 7 C
2 2 . u 1 u 1 u 1 u 2 2 . u 2 2 . u 2
C 2 2 2
Only for training and service purposes
R 2 0 0
O N _ O F F 2
2 7 K
R 2 0 2
D I N
F 1 V 5 _ V R F 2 V 9 _ V M M E
2 V 6 5 _ V B T 1 V 8 _ S D
2 3 8 C 2 3 9 C 2 4 0 C 2 4 1 C 2 4 2
2 . u 2 2 . u 2 2 . u 2 2 . u 2 2 . u