3. TROUBLE SHOOTING
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Only for training and service purposes
LGE Internal Use Only
3.12 Charger
• D802 uses SMB349 (External charger IC) for charging control.
• Charging Procedure
- Supply the VBUS_USB_IN_PM through a TA or u-USB cable
- SMB349 controls the charging current
- Charging current flows into the main battery
• Troubleshooting Check Point
- Connection of the TA or u-USB cable (OVP U12003)
- Charging current path (Charger IC U8000)
- Main battery
• During charging operation TP signal goes low and when stop charging goes high.
TP5
TP4
U8000
TOP
R8060
0
36
37
31
32
33
34
38
39
40
41
35
SD
A
PGND6
SUSP/SHDN
STAT
OTG/ID
SC
L
SYSO
N
DCIN_4
DCIN_3
D+
D-
+5V0_OTG_OVP
C8043
4.7u
R8067
0
+1V8_VREG_S3A
1M
R8053
CHG_SYSON_USBI
N
4.7u
C8042
R8070
0
DNI
R8069
GAUGE_I2C_SDA
GAUGE_I2C_SCL
CHG_SHDN
USB_ID
EXT_CHG_STA
T
1005 10V
1005 10V
13'1/21
TP5
TP4