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4.2 USB Trouble
VBAT power(C601 or C600) is same to battery?
VBAT
C601
C602
0.1u
4.7u
10V
C3
ACC_GP_USB_CS
CHIP_SEL
TEST
TP671
A4
ACC_USB_HS_IN_CLK
CLOCK
VCC_IO1
B1
USB_DATA(0)
DATA0
VCC_IO2
TP672
A1
USB_DATA(1)
DATA1
RREF
A2
USB_DATA(2)
DATA2
DM
A3
U602
ACC_USB_HS_DATA(3)
DATA3
DP
A5
DATA4 ISP1508AET
ACC_USB_HS_DATA(4)
FAULT
A6
ACC_USB_HS_DATA(5)
DATA5
ID
B6
ACC_USB_HS_DATA(6)
DATA6
CFG2
C6
ACC_USB_HS_DATA(7)
DATA7
CFG1
D5
ACC_USB_HS_NXT
NXT
PSW_N
D6
ACC_USB_HS_STP
STP
VBUS
E5
ACC_USB_HS_DIR
DIR
REG3V3
E1
CFG0
XTAL1
E6
REF1V8
XTAL2
C607
C608
4.7u
0.1u
USB Transceiver for High Speed
TP04_BB
R601
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
START
(Measure during the state of
USB module running)
Input power(C606) is 5V?
Yes
Yes
ACC_GP20_USB_CS(R601) is 1.8V?
Yes
Change main board
TP03_BB
C601 C602
VDDE_1V8
C4
B5
B2
C2
C1
USB_DM
D1
USB_DP
E2
D3
B3
B4
D4
R604
F4
VBUS
E3
1K
F5
TP673
USB_XTAL1
F6
TP02_BB
C606
TP04_BB
R601
< Main Board – Bottom side >
No
Check host USB port
or USB cable
No
Resolder or check the VBAT line
No
Resolder or change U601
U601
4
DRAIN
3
CNTRL
2
G2
G1
GND
VBUS
4
3
1
OUT
IN
IN
2
1
NFM21PC105B1A3 FL601
DRAIN_THERMAL 9
PSD12-LF
INSTPAR
D601
OVP Circuit
- 81 -
4. TROUBLE SHOOTING
TP02_BB
C606
NUS3065MUTAG
5
SRC
6
GATE
7
OUT
8
VCC
USW_DM
USW_DP
C606
1u
USW_ID
EVLC18S02003
VA601
REV.F
GU070-5P-SD-E1500
REV.F (Rev.1.1 update)
TP03_BB
C601
C602
LGE Internal Use Only
CN601
6
8
10
12
14
1
2
3
4
5
7
9
11
13
15
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Table of Contents
Troubleshooting
