LG P705 - Charging Trouble Shooting

4. TROUBLE SHOOTING
- 72 -
Copyright © 2012 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
4.11 Charging Trouble Shooting
1. Charging Procedure
- Connect TA or u-USB Cable
- Control the charging current by LP8727-B IC
- Charging current ows into the battery
2. Check Point
- Connection of TA or USB Cable
- Charging IC (LP8727-B)
- Battery
3. Troubleshooting Setup
- Connect TA and battery to the phone
4. Troubleshooting Procedure
- Check the charger (TA or USB Cable)
- Check the OVP Circuit
- Check the Charging IC
C809
1n
D802 D803 D804
CN801
6
7
8
1
2
3
4
5
9
10
11
C807
22p
ZD800
FL800
IN OUT
GND1 GND2
FL801
P2
P4
P1 P3
6P
5P
uUSB_POWER
MAX_DP
MAX_DM
USB_ID
MICRO USB IO
TA (5.1V / 705mA)
K01
825R
765C
u1
C575
1u
C566
1u
TP400
U506
C5
D2
B5
D3
D1
E1
E2
E3
E5
E4
A1
C1
B1
A4
A5
A3
A2
D5
4D 4C 3C 2C 2B 3B 4B
LCS ADS
¬¡TNI
1DNG 2DNG 3DNG 4DNG
BATT2
DN
DP
U1
U2
AUD1
AUD2
MIC
VBUS1
VBUS2
D-
D+
ID
RES
DSS
EXPDET
CAP
BATT1
VREG_MSME_1.8V
K7.4
925R 035R
K7.4
565C u1
C564
1u
C576
1u
GND
VBAT
uUSB_POWER
VREG_MSME_1.8V
UART_TX
UART_RXUSB_ID
VCHG_VBUS
MAX_DM
MAX_DP
USBH_DM
MINIABB_I2C_SDA
MINIABB_I2C_SCL
MINIABB_INT
USBH_DP
Mini ABB_NS
TA
Battery