Charging Trouble - LG KE800 Service Manual

4.5 Charging Trouble

• Charging method : CC-CV
• Charger detect voltage : about 4.0V
• Charging time : 3h under
• Charging current : 500mA
• Cutoff current : 100mA
• Low battery alarm
-. Idle : 3.62V
-. Dedicated : 3.50V
1) Under very low temperature, battery capacity will be reduced. That can cause charging fauilure.
LGE recommends charging within -5˚C ~ 45˚C.
2) Under very low temperature, battery voltage will change rapidly. It's natural property of Li-Ion
battery.
4.2V~3.86V
_CHG_EN
Charging Procedure
• Plug TA & detect charger
• Control the charging by _CHG_EN signal from S-GOLD2. When the mobile is turned-off, that signal
fixed as "LOW"
• Charging Current flows into the Battery
Check Points
• Connection of TA (check TA voltage 4.8V)
• Charging Current Path component voltage drop
• Battery voltage
• Switch-off voltage : 3.35V
• Charging temperature ADC range
- ~ -20˚C : small charging operation.
- -5˚C ~ 45˚C : charging.
- 60˚C~ : not charging operation small charging operation.
3.85V~3.75V 3.75V~3.69V
VBUS_USB VCHG
R216
10K
R221 C241 C242
R217 R222
10K
100K
39K
1u 1u
- 33 -
4. Trouble Shooting
3.69V~3.62V
VBAT 2V72_IO
U207 ISL6299
1 10
CRDL BAT
2
USB R214
100K
6 3
IMIN _PPR
4
_CHG
9
ICDL
7 8
USBON GND
5 11
_EN PGND
R218 C243
100K 1u
CHG_EOC