Charger Troubleshooting - LG GT810h Service Manual

4.8 Charger Troubleshooting

u-USB Connector
VREG_MSMP_2.6V
CN401
6
8
TA
10
12
(4.8V)
1
2
3
4
5
u-USB
7
9
Cable
11
13
■ Charging Procedure
- Connect TA or u-USB Cable
- Control the charging current by PM7540 IC
- Charging current flows into the battery
■ Check Point
- Connection of TA or USB Cable
- Charging current path
- Battery
■ Troubleshooting Setup
- Connect TA and battery to the phone
■ Troubleshooting Procedure
- Check the charger (TA or USB Cable) connector
- Check the OVP Circuit
- Check the charging current Path
- Check the battery
Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
TA OVP Circuit
2mm
9
DRAIN_THERMAL
ID
8
VCC
7
OUT
6
GATE
5
SRC
For OVP test
U402
C405
3900p
50V
Route together from both end of resistor 0.1ohm.
ISNS_P
ISNS_M
Main
+VPWR
VBAT
Battery
- 105 -
4. TROUBLE SHOOTING
NFM18PC104R1C3
1
1
IN
2
GND
3
CNTRL
4
DRAIN
NUS3065MUTAG
Battery Charging Circuit
1%
U401 NUS5530MN
Drain_B
2012
1
NC1 Collector_B
2
Collector Emitter
3
Source Base
4
Drain NC2
Gate
C402
C401
0.01u
33u
VCHG_VBUS
2mm
IN
OUT
GND1 GND2
FL401
VCHG_VBUS
2mm
10
9
8
7
CHG_CTL_N
6
5
BATT_FET_N
LGE Internal Use Only