4. TROUBLE SHOOTING
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Only for training and service purposes
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4.11 Charging Trouble Shooting
1. Charging Procedure 3. Troubleshooting Setup
- Connect TA or u-USB Cable - Connect TA and battery to the phone
- Control the charging current by RT8965 IC
- Charging current flows into the battery
2. Check Point 4. Troubleshooting Procedure
- Connection of TA or USB Cable - Check the charger (TA or USB Cable)
- Charging IC (RT8965) - Check the OVP Circuit
- Battery
- Check the Charging IC
- Check the battery
D400
FL400
1
IN
OUT
GND1 GND2
00
4
DZ
p2
2
20
4
C
C404
22p
FL401
5
6
3
1
4
2
P2
P4
P1
P3
6
P
5
P
30
4
C
u1
CN400
11
10
9
5
4
3
2
1
8
7
6
R1
0
0
R2
ZD402
ZD403
VBUS_CHG_JIG
VBUS_CHG_IN
USB_ID
MAX_DM
MAX_DP
VBUS 2mm
2mm
u1
70
4
C
R401 10K
U400
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
TP400
C408
1u
00
4
C
u1
2.2K
R400
VBAT
VREG_MSMP_2.6V
USBH_DM
UART_TX
UART_RX
USBH_DP
VCHG_VBUS
MINIABB_INT
MINIABB_I2C_SCL
MINIABB_I2C_SDA
GND
VBUS_CHG_IN
USB_ID
MAX_DM
MAX_DP
TA
(5.1V, 700mA)
Main
Battery