LG D686 - Charging

3. TROUBLE SHOOTING
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Only for training and service purposes
LGE Internal Use Only
3.6 Charging
D686 uses Switching Chaging IC for charging control. The Chaging IC(MAX8971EWP) circuit includes the charging pass transistor
detects the VDD and VBAT voltages, and its control driver. The Chaging IC(MAX8971EWP) maximum charging current is set around
1.2A.
Charging Procedure
- Supply the VCHG use a TA or u-USB cable
- The Chaging IC(MAX8971EWP) control the charging current
- Charging current ows into the main battery
Troubleshooting Check Point
- Connection of the TA or u-USB cable
- Main battery
U606
1nC617
0.1uC614
L602
1u
VBATT
R621
47m
VCHG_OVP_IN
1uC623
1uC624
+1V8_VIO_MTK
C616 1u
C625 4.7u
2.2uC615
2.2uC626
4.7KR619
VCHG_LDO_4V9
U606
C5
D2
D3
D1
A5
B5
A1
C1
B1
A4
A3
A2
D5
D4
C4
C3
C2
B2
B3
B4
I2CIN
IRQB
LX2
BST
GND
SCL
SFO
AVL
PG2
VICHG
CS
LX1
BYP
PG1
THM
BAT
DC1
PVL
DC2
SDA
C622 1u
1
2
I2C_SENSOR_SDA
I2C_SENSOR_SCL
CHARGER_IRQ_B
10V
U606(Charger IC)