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4. TROUBLE SHOOTING
4.2 USB Trouble
TP2
TP3
VBAT power(C601 or C600) is same to battery?
TP4
G
2
G
1
V
B
U
S
4
3
O
U
T
N I
2
1
N
F
M
2
1
P
C
1
0
5
B
1
A
3
F
L
6
0
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P
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D
1
2
L -
F
N I
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P
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3
A
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4
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5
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1 .
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1
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7 .
u
U
S
B
T
a r
LGE Internal Use Only
START
(Measure during the state of
USB module running)
Input power(C603) is 5V?
Yes
Yes
ACC_GP_USB_CS(R603) is 1.8V?
Yes
Change main board
U
6
0
0
N
U
S
3
0
6
5
M
U
T
A
G
4
D
R
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u
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7 .
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1
0
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4
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2
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P
1
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0
8
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E
T
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4
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3
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D I
B
3
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D
A
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7
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1
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4
N
X
T
P
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W
_
N
F
4
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T
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B
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E
3
D
R I
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3
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3
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5
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0
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E
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A
L
2
n
s
c
e
v i
e
f r
r o
H
g i
h
S
p
e
e
d
No
Check host USB port
or USB cable
No
Resolder or check the VBAT line
No
Resolder or change U601
5
6
7
8
9
C
6
0
2
0
1 .
u
C
6
0
3
1
u
M
C I
2
P
U
S
W
_
A
D
TP2
TP3
_
D
M
_
D
P
R
6
0
1
V
B
U
S
1
K
U
S
B
_
X
T
A
L
1
< Main Board – Bottom side >
TP4
- 76 -
Copyright © 2009 LG Electronics. Inc. All right reserved.
C
N
6
0
0
6
8
1
0
1
2
1
4
1
2
U
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W
_
D
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3
F
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6
0
0
U
S
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_
D
P
4
5
B
L
M
1
5
H
D
1
8
2
S
N
1
7
9
C
6
0
4
1
1
2
2
p
1
3
C
_
D
E
T
1
5
Only for training and service purposes
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Table of Contents
Troubleshooting
