LG LG-P715 - USB Trouble Shooting

4. TROUBLE SHOOTING
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Copyright © 2013 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
4.12 USB Trouble shooting
Charging Procedure
- Connect USB Cable
- Control the charging current by PM8029 IC
- Charging current ows into the battery
Check Point
- Connection of USB Cable
- USB Communication path
Troubleshooting Setup
- Connect USB to the phone
Troubleshooting Procedure
- Check USB Cable) connector(No.1)
- Check D106,FL1(No.2)
- Check PMIC(No3)
- Check TVS Diode(No4)
- Check common mode lter(No5)
- Check MSM8225(No.6)
R2010
4020
TP2005
R2013
10K
DNI
R2011
E33
G33
D36
A33
B34
C33
E31
B32
B28
G27
D18 G17 H16 A19
E13 G13 AJ5 AG5 AG7 AJ3 AJ7 AE7 C21 B20 B22 A21 C23
F2 E1 E3 D2
AM8
AM10 AK10 AN11 AJ11
A25 G29 C27 E27 A27 E29 H28 B26 D34 F32 C35
EBI2_OE_N EBI2_WE_N EBI2_UB_N EBI2_LB_N EBI2_WAIT_N EBI2_CS0_N EBI2_CS1_N EBI2_CS2_N_GPIO_98 EBI2_CLK EBI2_ADV_N EBI2_BUSY0_N
WDOG_EN
MODE0 MODE1 MODE2 MODE3 TS_LR TS_LL
TS_UR
TS_UL USBPHY_VBUS USBPHY_DP USBPHY_DN USBPHY_ID USBPHY_REXT TDI TDO TMS TCK TRST_N
RTCK GPIO_132 GPIO_131
GPIO_130 GPIO_129 GPIO_128 GPIO_127
EBI2_A_D_5
EBI2_A_D_6
EBI2_A_D_7
EBI2_A_D_8
EBI2_A_D_9
EBI2_A_D_10
EBI2_A_D_11
EBI2_A_D_12
EBI2_A_D_13
EBI2_A_D_14
EBI2_A_D_15
TP2004
TP2003
TP2002
VREG_MSME_1.8V
CAM_IOVDD_1.8V_EN
USBH_DM
USBH_DP
COMPASS_DRDY
BATT_ID_PULLUP
MSM_TRSTN
MSM_RTCK
MSM_TCK
MSM_TDI
MSM_TDO MSM_TMS
CHG_VALID
EAR_MIC_EN
NFC_WCN_HWI2C_SDA
NFC_WCN_HWI2C_SCL
MSM_THERM
4.02K
1%
C4020
22u
C4037
1u
R4008
22K
C4025
1u
TP4003
C4038
0.1u
C4024 10u
R4010
10K
TP4001
+VPWR
U4007
A5 H4 H2 R7 P8 D2 D4 D22 A13 H22
C23 G23 A19 B12 A11 K5 G5 N15 R13 P14 N13 N11 R11 P12 R15 P16 M22 M20 N23 F4
M10
K11
K13
K9
E5
N7
N5
N9
K3
M4
N3
E1
F2
P2
TCXO_IN
XTAL32K_IN
XTAL32K_OUT
TCXO_A0_EN
TCXO_OUT_A0
TCXO_D0_EN
TCXO_OUT_D0
TCXO_D1_EN
TCXO_OUT_D1
SLEEP_CLK0
PS_HOLD
CBLPWR_N
KPD_PWR_N
RESIN_N
VDD_MSM_IO
VDDANA_SPKR
VDDIN_SPKR_1
VDDIN_SPKR_2
VCHG_1 VCHG_2
VPH_PWR1 VPH_PWR2
BAT_FET_N
VBAT
VCOIN
VREF_THERM
BATT_THERM
REF_BYP
REF_GND
VDD_S1_1 VDD_S1_2
VDD_S2 VDD_S3 VDD_S4
VDD_NCP_L7
VDD_SMPS
VDD_L1_L2
VDD_L3_L4_L5_L6_1 VDD_L3_L4_L5_L6_2
VDD_L8_L9_L10_L11_1 VDD_L8_L9_L10_L11_2
VDD_L12_L13_L14_L15_L16_1 VDD_L12_L13_L14_L15_L16_2
VDD_L17_L18_L19
+VPWR+VPWR
4.7uC4022
+VPWR VREG_MSME_1.8V
0.1u
C4036
C4028 0.1u
0.1u
C4032
VREG_MSME_1.8V
R4011
51K
TP4002
C4035 0.1u
0.1uC4034
0.1uC4033
0.1uC4031
C4027 4.7u
C4026 4.7u
C4021
33p
C4023 4.7u
VCHG_VBUS
X4001
FC-135_32.768KA-AC3
32.768KHz
2 1
R4009 1
SLEEP_CLK
PMIC_TCXO
TCXO_PM_19.2MHZ
PS_HOLD
BT_FM_CLK_WCN
WLAN_CLK_WCN
TCXO_EN
JTAG_PS_HOLD
KPD_PWR_N
WLAN_CLK_REQ_WCN
VCOIN
VBAT_TEMP
BT_FM_CLK_REQ_WCN
Remove Cap. 0819
CHANGE 1215
CHANGE 1208
CHANGE 1215
D106
C111
1n
FL101
5
6
31
42
P2 P4
P1 P3
P6
P5
CN102
6
7
8
1
2
3
4
5
9
10
11
D103 D104
D102
FL1
IN
OUT
GND1 GND2
USB_ID
USBH_DP
USBH_DM
5V_VCHG
MICRO USB IO
MICRO USB CONN
MSM8225
PMIC
1
2
4
3
6
5