4. TROUBLE SHOOTING
- 3 -
Copyright © 011 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
R7
2.7K
100n
C19
SC424
EUSY0369702
U1
3
31
6
1
30
32
72
92
62
22
01
52
15
31
16
20
19
82
41
21
8
9
7
2
42
21
5
18
11
17
4
VOUT
PGND4
4
NI
V
PGND5
VIN
T
S
B
XL
S
XL
V5V
BST
2
NI
V
1
NI
V
LX3
2
D
N
G
P
L
N
E
PGND6
LX2
PGND3
1
D
N
G
P
LX1
V
S
P/
N
E
3
NI
V
D
O
O
G
P
2
D
N
G
A
3
D
N
G
A
N
OT
MI
LI
VIN5
FB
VLDO
LX4
AGND1
K7
4
9
R
1u
C5
DNI
C2
47p
C11
K1.
91
1
R
10n
C10
2.2u
C7
1u
C6
KRX102U
EQBA0000601
10
1
Q
5
4
1
2
3
0
42
1
R
32
1
R
K0
1
C126
DNI
2.2u
L101
100K
R12
DNI
R13
51
R
K0
21
VDD_3.75
0.1u
C121
C119
22u
5
R
K0
3
C14
10u
55
1
R
I
N
D
100K
R103
C120
22u
C105
22u
10u
C13
LTE_PWR_EN
LTE_EN
TP5
TP318
22u
C300
TP317
TP308
TP314
TP304
TP305
SIM_PWR
TP306
TP307
TP315
CN300
ENZY0030701
24-6407-052-001-888
54
53
50
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
52
51
VDD_3.75
0.1u
C305
1u
C303
0.1u
C304
10u
C301
4.7u
C302
TP320
TP321
TP322
LT_USIM_DET/
SIM_RST/
SIM_CLK
SIM_DATA
TP4
TP3
TP6