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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
START
(Connect a USB Cable from a PC)
Change main board
Yes
No
Change main board
Yes
ACC_GP_USB_CS(TP3) is 1.8V?
No
Yes
< Main Board – Bottom side >
TP1
TP2
Is it open state
between USW_ID(TP1) & TP2?
Finish
TP3
4.2 USB Trouble
If Maxim, then 4.7uF
TI : PD = USB,
MUIC
If TI, then 10nF
MAXIM : NA =
C509
4.7u
VBAT
DNIR507
IC
C3
INT
B2
A2
ISET
A1
MIC
B1
RES
SCL
C2
C1
SDA
B3
U1
U2
A3
B4
UID
VB
D5
U501
D4
AUD1
D3
AUD2
D2
BAT
CAP
D1
COM1
C5
B5
COM2
A4
DN1
A5
DP2
GND
C4
MAX14526EEWP_TCC6
R508 DNI
2.2K
R504
0R502
USW_ID
USW_DM
USW_DP
10V
TP501
0R655
51K
R500
TP500
RREF
STP
D6
TEST
C4
F4
VBUS
VCC
F3
B5
VCC_IO1
VCC_IO2
B2
F5
XTAL1
XTAL2
F6
B6
C6
DATA7
E5
DIR
DM
C1
D1
DP
FAULT
E2
GND1
C5
D2
GND2
GND3
E4
D3
ID
NC1
F1
F2
NC2
D5
NXT PSW_N
D4
E6
REF1V8
E3
REG3V3
C2
CFG0
E1
B4
CFG1
CFG2
B3
CHIP_SEL
C3
A4
CLOCK
DATA0
B1
A1
DATA1
DATA2
A2
A3
DATA3
DATA4
A5
A6
DATA5
DATA6
ISP1508AET
U502
C513
0.1u
0.1u
C500
4.7u
C501
4.7u
C512
VBAT
ACC_USB_HS_NXT
ACC_USB_HS_STP
ACC_GP_USB_CS
ACC_USB_HS_IN_CLK
USB_DATA(0)
USB_DATA(1)
USB_DATA(2)
ACC_USB_HS_DATA(3)
ACC_USB_HS_DATA(4)
ACC_USB_HS_DATA(5)
ACC_USB_HS_DATA(6)
ACC_USB_HS_DATA(7)
ACC_USB_HS_DIR
TP2
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