4. TROUBLE SHOOTING
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LGE Internal Use Only
Copyright © 011 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4.5 Charging Trouble
TEST POINT
CIRCUIT
Connected to CN401 #1 pin (TP01)
CN401 & 1 Pin
(connected to TP01)
U401 & E4,E5 Pin
(TP01)
TP01
2.2K
R408
C402
0.1u
VUSB_CHG_IN
VUSB_CHG_IN
R401
47K
VDD_IO_1V8
VBAT
1u
C401
10K
R409
VDD_IO_1V8
FB403
1800
LP8727
U401
C5
D2
B5
D3
D1
E1
E2
E3
E5
E4
A1
C1
B1
A4
A5
A3
A2
D5
4
D
4
C
3
C
2
C
2
B
3
B
4
B
L
C
S
A
D
S
¬
¡
T
N
I
1
D
N
G
2
D
N
G
3
D
N
G
4
D
N
G
BATT2
DN
DP
U1
U2
AUD1
AUD2
MIC
VBUS1
VBUS2
D-
D+
ID
RES
DSS
EXPDET
CAP
BATT1
C412
1u
1u
C411
R406
DNI
R403
10
R404
10
USB_DP
USB_DM
UART_TX
MUIC_ACC_ID
UART_RX
VUSB_LDO_4V9
I2C_SDA
I2C_SCL
MUIC_IO_P
MUIC_IO_M
MUIC_INT_N
TP01
CN401 & 1 Pin
(connected to TP01)
U401 & E4,E5 Pin (TP01)
TP01