LG LG-D855 - Charger

3. TROUBLE SHOOTING
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Copyright © 2014 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
3.12 Charger
• D855 uses BQ24296 (External charger IC) for charging control.
• Charging Procedure
- Supply the VBUS_USB_IN_PM through a TA or u-USB cable
- BQ24296 controls the charging current
- Charging current ows into the main battery
• Troubleshooting Check Point
- Connection of the TA or u-USB cable (OVP U4750)
- Charging current path (Charger IC U4700)
- Main battery
• During charging operation TP signal goes low and when stop charging goes high.
U4700
BQ24296GRER
21
5
2011
14
10
17
15
16
2
23 22
18
24
12
1
6
25 19
13
9 8 7
4
3
PG
STAT
INT OTG CE
BAT1
SW1
PPAD
SDA
VBUS1
QON
VBUS2
PGND2
REGN
PMID
PSEL
SYS2
SYS1
PGND1
ILIM
BAT2
TS
SW2
SCL
BTST
47nC4705
10K
R4703
10K
R4700
+1V8_VREG_S3A
+5V0_OTG_OVP
1u
C4702
10K
R4704
DNI
R4705
R4701
10K
10K
R4702
10u
C4704
4.7u C4703
CHG_SYSON_USBIN
GAUGE_I2C_SDA
GAUGE_I2C_SCL
EXT_CHG_PG
EXT_CHG_STAT
tuning point
TP4
TP5
<Main Top>
U4700
TP4
TP5