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Only for training and service purposes
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4. TROUBLE SHOOTING
4.11 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(NUS5530MIN)
-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
Main
Battery
TA
(5.1V)
Charging Current Flow
C381
33uF
smhom001
871R
VCHG_VBUS
+VPWR
VBATT
NUS5530MNQ1
5
64
73
82
91
10
DRAIN_B
NC1 COLLECTOR_B
COLLECTOR EMITTER
SOURCE BASE
DRAIN NC2
GATE
ISNS_P
CHG_CTL_N
BATT_FET_N
+VPWR
[ISNS_N]
1LF
103
5
100YEFS
3C1R401
C
P81MFN
N
I
T
U
O
1DNG
2
D
N
G
1u
C118
GU073-5P-SD-E1500
ENRY0008801
CN18
15
13
11
9
7
5
4
3
2
1
14
12
10
8
6
1UF
C214
22pF
C225
VCHG_VBUS
U30MAX14528
9
6
53
4
82
71
IN1OUT1
IN2OUT2
IC1
OVLOIC2
D
NG
D
N
G
P
C224
22pF
2DZ
F
L-2
1
DSP
RAP
TS
N
I
MAX_DP
MAX_DM
USB_ID
2mm
2A
2mm
Close by uUSB CONN
Close by uUSB CONN
Main
Battery
TA
(5.1V)
Charging Current Flow
TP1
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