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LGE Internal Use Only Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4. Trouble Shooting
4.2 USB Trouble
START
(Measure during the state of
USB module running)
Change main board
Yes
No
Resolder TP1
Yes
ACC_USB_PUEN(TP2) is 1.8V?
No
Yes
< Main Board – Top side >
VDDE_1V8 (TP1) is same to 1.8V?
Finish
TP1
TP2
TP2
TP1
U2.2
3
06C
7
06C
U
1
.
0
S
B2
0
11
PS
I
3
06
U
7
6
5
4
8
3
92
01
1
11
12
13
14
15
PGND
SOFTCON
VPU_3_3
VCC_5_0
VREG_3_3
EO
_
C
N
V
C
R
+D
OPV_P
V
-
D
VM_VMO
SUSPND
VCC_IO
VBUSDET
1
16C
U
1
3351
6
R
3
3816R
8
V1
_
EDD
V
SUBV
K
0
01
2
2
6
R
M
1
3
2
6R
M1
52
6R
K
5
.
1
7
2
6R
M
V
_
T
A
D_
B
S
U
EO_BS
U
P
V
_TAD_BSU
TED
B
V
_B
SU_CC
A
VCR_
B
SU_CC
A
N
E
U
P_BS
U
_CCA
DN
P
SU
S
_BSU
_
CCA
TP2
TP1
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