LGE Internal Use Only
Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4. TROUBLE SHOOTING
- 105 -
4.8 Charger Troubleshooting
■
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
2mm
u-USB Connector
50V
For OVP test
2mm
TA OVP Circuit
GND2
1
IN
OUT
FL401
NFM18PC104R1C3
GND1
3900p
C405
VCHG_VBUS
VREG_MSMP_2.6V
D401
PRSB6.8C
INSTPAR
ZD401
PSD12-LF
3
CNTRL
DRAIN
4
9
DRAIN_THERMAL
6
GATE
2
GND
1
IN
OUT
7
SRC
5
VCC
8
U402
NUS3065MUTAG
10
11
12
13
2
3
4
5
6
7
8
9
CN401
1
R401
200K
ID
Route together from both end of resistor 0.1ohm.
1%
2mm
2012
Battery Charging Circuit
VCHG_VBUS
C401
33u
VBAT
1
NC1
6
NC2
3
Source
NUS5530MN
U401
Base
7
Collector
2
9
Collector_B
Drain
4
Drain_B
10
8
Emitter
Gate
5
R402
0.1
+VPWR
0.01u
C402
BATT_FET_N
CHG_CTL_N
ISNS_M
ISNS_P
TA
(4.8V)
u-USB
Cable
Main
Battery
Содержание GT810h
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