4. TROUBLE SHOOTING
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Only for training and service purposes
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4.11 Charging Trouble shooting
CN4000
15
13
11
9
7
5
4
3
2
1
14
12
10
8
6
ZD4002
ZD4003
u1
30
04
C
FL4001
5
6
3
1
4
2
P2
P4
P1
P3
6
P
5
P
C4005
22p
p2
2
20
04
C
00
04
DZ
FL4000
1
IN
OUT
GND1 GND2
D4000
MAX_DM
MAX_DP
USB_ID
VBUS_CHG_IN
For FCC RE in case of USB Comm.
2mm
VBUS 2mm
u-USB Connector
C4069
1u
C4067
1u
C4066
1u
TP4003
U4003
C5
D2
B5
D3
D1
E1
E2
E3
E5
E4
A1
C1
B1
A4
A5
A3
A2
D5
4
D
4
C
3
C
2
C
2
B
3
B
4
B
L
C
S
A
D
S
¬
¡
T
N
I
1
D
N
G
2
D
N
G
3
D
N
G
4
D
N
G
BATT2
DN
DP
U1
U2
AUD1
AUD2
MIC
VBUS1
VBUS2
D-
D+
ID
RES
DSS
EXPDET
CAP
BATT1
R4019 10K
86
04
C
u1
22u
C4007
R4033
2.2K
C4006
22u
USBH_DM
VBAT
VBAT
USBH_DP
VCHG_VBUS
MINIABB_INT
GND
VREG_MSMP_2.6V
MAX_DM
MAX_DP
USB_ID
UART2DM_RX
UART2DM_TX
VBUS_CHG_IN
MINIABB_I2C_SDA
MINIABB_I2C_SCL
Mini ABB
1%
0603
Charging Procedure
- Connect TA or u-USB Cable
- Control the charging current by RT8965 IC
- Charging current flows into the battery
Check Point
- Connection of TA or USB Cable
-Charging IC (RT8965)
- Battery
Troubleshooting Setup
- Connect TA and battery to the phone
T
roubleshooting Procedure
- Check the charger (TA or USB Cable) connector
- Check the OVP Circuit
- Check the Charging IC
- Check the battery
Main
Battery
TA
(5.1V, 700mA)