Usb Trouble Shooting - LG -P715 Service Manual

4.12 USB Trouble shooting

MICRO USB CONN
1
CN102
10 8
1
6 2
3
7 4
5
11 9
MSM8225
EBI2_A_D_5
G27
EBI2_A_D_6
B28
EBI2_A_D_7
B32
EBI2_A_D_8
E31
EBI2_A_D_9
C33
EBI2_A_D_10
B34
EBI2_A_D_11
A33
EBI2_A_D_12
D36
EBI2_A_D_13
G33
EBI2_A_D_14
E33
EBI2_A_D_15
Charging Procedure
- Connect USB Cable
- Control the charging current by PM8029 IC
- Charging current flows into the battery
Check Point
- Connection of USB Cable
- USB Communication path
LGE Internal Use Only
MICRO USB IO
USB_ID
C111
1n
D102
4
D103
TP2005
4.02K
1%
6
JTAG_PS_HOLD
FL1
2
IN OUT
GND1 GND2
D106
FL101
6
2 4
P2 P4
1 3
P1 P3
5
5
D104
CHANGE 1208
VCHG_VBUS
+VPWR
VREG_MSME_1.8V
C4038
0.1u
3
TCXO_PM_19.2MHZ
X4001
TP4001
WLAN_CLK_REQ_WCN
32.768KHz
WLAN_CLK_WCN
TP4002
TCXO_EN
PMIC_TCXO
R4009
BT_FM_CLK_REQ_WCN
BT_FM_CLK_WCN
SLEEP_CLK
CHANGE 1215
R4010
PS_HOLD
TP4003
10K
KPD_PWR_N
R4011
51K
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 filter(No5)
- Check MSM8225(No.6)
- 91 - Copyright © 2013 LG Electronics. Inc. All right reserved.
4. TROUBLE SHOOTING
5V_VCHG
USBH_DM
USBH_DP
+VPWR +VPWR
CHANGE 1215
C4020
22u
C4025
1u
Remove Cap. 0819
P2
TCXO_IN
F2
XTAL32K_IN
E1
XTAL32K_OUT
N3
TCXO_A0_EN
M4
TCXO_OUT_A0
K3
TCXO_D0_EN
N9
TCXO_OUT_D0
N5
1
TCXO_D1_EN
N7
TCXO_OUT_D1
E5
SLEEP_CLK0
PMIC
K9
PS_HOLD
K13
CBLPWR_N
K11
KPD_PWR_N
M10
RESIN_N
Only for training and service purposes
+VPWR VREG_MSME_1.8V
C4
C4021
C4
33p
C4
C4
C4
C4
C4
C4
C4
C4
C4
C4036
0.1u
U4007