Charging Trouble - LG KE820 Service Manual

5. Trouble shooting

5.3 Charging trouble

Check Points
-Connection of TA (check TA voltage 4.8V)
-Charging Current Path component voltage drop
-Battery voltage
• Charging method : CC-CV
• Charger detect voltage : about 4.0V
• ChCharging time : 3h under
• Charging current : 500mA
• Cutoff current : 100mA
• Low battery alarm
- Idle : 3.62V
-. Dedicated : 3.50V
4.2V~3.86V
3.85V~3.75V
VCHG
Q201
SI3457BDV
S
G
VCH_CTL
D1 D2
VCHS
- 80 -
• Switch-off voltage : 3.35V
• Charging temperature ADC range
- ~ -20°C : small charging operation.
- -20°C ~ 60°C : charging.
- 60°C ~ : not charging operation small
charging operation.
3.75V~3.69V
C224
R217
4.7u
100K
D3 D4
D201
CRS08
R220 VBAT
0.15
C235
100u
3.69V~3.62V