- 82 -
LGE Internal Use Only
Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4. TROUBLE SHOOTING
LGE Internal Use Only
4.4 Power On Trouble
TEST POINT
CIRCUIT
VCORE
2V85_VSIM
2V5_VMIC
1V93_VEXT
1V82VINT
1V88_VMEM
1V8_VRTC
1V5_VPLL
VBUS_USB
2V75_VCXO
2V5_VABB
D106
TP2
U103
U10
2
TP1
R118
1u
AB17
VVID2
AB21
VVID3
C102
VMEM_LDOFB
K19
VMIC
H22
VMMC
R22
VPLL
B6
D22
VPLL_LDO
B22
VRF_LDO
VRTC_LDO
N22
VSIM
T22
P22
VSIM_LDO
VSSRTC
L11
F16
VUSBIN
VUSB_LDO
F17
V22
VVID1
W1
VEXT2
AB4
VEXT3V1
VEXT3V2
AB11
A14
VEXT_LDO1
VEXT_LDO2
B14
VGP_LDO
K18
VINT1
J12
U22
VINT2
VINT_LDO
L14
L13
VINT_LDOFB
VMEM1
C1
VMEM2
A2
VMEM3
G1
VMEM4
L1
VMEM_LDO1
L18
VMEM_LDO2
L19
P1
VCORE3
VCORE4
AB2
AB9
VCORE5
VCORE6
AB18
C12
VCOREFB
VCOREPWR1
A10
A11
VCOREPWR2
B9
VCORESW1
VCORESW2
B10
VCORESW3
B11
VDDRTC
J10
M14
VDDUSB
VEXT1
R1
A13
VBAT1
M19
VBAT10
B13
VBAT2
VBAT3
C21
VBAT4
C22
VBAT5
J13
J14
VBAT6
K13
VBAT7
VBAT8
K14
M18
VBAT9
VBUS
N19
A4
VCORE1
VCORE2
F1
D21
VABB
VAPP
D20
VAPPGATE
E19
N
Q
8
1
C
9
1
C
P
Q
A
P
9
1
B
3
G
R
W
H
N
R
W
L
N
1
E
N
I
0
2
A
9
1
A
P
I
8
D
5
1
A
T
A
D
2
D
2
A
T
A
D
3
D
3
A
T
A
D
4
A
T
A
D
1
B
2
C
5
A
T
A
D
6
A
T
A
D
3
C
2
B
7
A
T
A
D
8
A
T
A
D
4
C
9
A
T
A
D
3
B
2
E
0
A
T
A
D
1
A
T
A
D
3
E
4
B
0
1
A
T
A
D
5
C
1
1
A
T
A
D
2
1
A
T
A
D
6
D
3
A
3
1
A
T
A
D
6
C
4
1
A
T
A
D
8
E
0
2
D
D
A
1
2
D
D
A
8
F
7
D
2
2
D
D
A
0
1
K
3
2
D
D
A
3
D
D
A
3
J
4
D
D
A
4
H
5
H
5
D
D
A
6
D
D
A
6
H
7
D
D
A
5
G
8
D
D
A
4
G
9
D
D
A
9
K
0
D
D
A
4
K
1
D
D
A
5
J
0
1
D
D
A
4
E
1
1
D
D
A
4
F
2
1
D
D
A
4
D
1
1
J
3
1
D
D
A
4
1
D
D
A
5
E
5
1
D
D
A
9
J
7
E
6
1
D
D
A
6
G
7
1
D
D
A
7
F
8
1
D
D
A
9
1
D
D
A
7
G
2
D
D
A
4
J
1u
C112
C
T
R
V
_
8
V
1
C122
22p
C105
33u
C
I
M
V
_
5
V
2
C123
0.1u
T
A
B
V
T
X
E
V
_
3
9
V
2
C108
1u
C103
1u
22u
C120
1u
C110
T
X
E
V
_
3
9
V
2
18nH
L101
ELCH0001052
M
I
S
V
_
5
8
V
2
C106
1u
C109
1u
22p
C121
S
A
I
B
C
I
M
S
H
C116
22p
T
N
I
V
_
2
8
V
1
1u
C111
1u
C107
C119
22p
L102
ELCP0006703
10uH
C118
0.1u
M
E
M
V
_
8
8
V
1
1u
C126
C104
1u
T
A
B
V
1u
C113
C117
0.1u
B
S
U
_
S
U
B
V
0.1u
C115
T
X
E
V
_
3
9
V
2
B
S
U
V
0.1u
O
X
C
V
_
5
7
V
2
C124
22p
C114
T
X
E
V
_
3
9
V
2
0.1u
C101
1
0
7
1
0
0
0
L
C
B
S
J
9
F
-
R
4
1
4
L
B
N
1
0
1
T
A
B
2.2u
C127
K
7
.
4
1
0
1
R
L
L
P
V
_
5
V
1
M
E
M
V
_
8
8
V
1
B
B
A
V
_
5
V
2
E
R
O
C
V
C125
0.1u
M
E
M
V
_
8
8
V
1
N
E
_
E
C
I
O
V
0
M
Q
D
1
M
Q
D
7
0
D
D
A
8
0
D
D
A
9
0
D
D
A
0
1
D
D
A
1
1
D
D
A
2
1
D
D
A
3
1
D
D
A
4
1
D
D
A
5
1
D
D
A
6
1
D
D
A
7
1
D
D
A
8
1
D
D
A
9
1
D
D
A
0
2
D
D
A
1
2
D
D
A
2
2
D
D
A
3
2
D
D
A
1
0
D
D
A
2
0
D
D
A
3
0
D
D
A
4
0
D
D
A
5
0
D
D
A
6
0
D
D
A
0
0
A
T
A
D
1
0
A
T
A
D
2
0
A
T
A
D
3
0
A
T
A
D
4
0
A
T
A
D
5
0
A
T
A
D
6
0
A
T
A
D
7
0
A
T
A
D
8
0
A
T
A
D
9
0
A
T
A
D
0
1
A
T
A
D
1
1
A
T
A
D
2
1
A
T
A
D
N
I
P
I
P
M
A
R
_
X
T
N
Q
P
Q
3
1
A
T
A
D
4
1
A
T
A
D
5
1
A
T
A
D
0
3
1
R
K
7
4
6
0
1
D
3
1
2
V
1
3
3
R
D
K
N
O
B
B
D
N
O
R
W
P
N
O
R
W
P
R
0
5
1
6
1
1
R
D
N
E
Y
E
K
R
E
W
O
P
TP1