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4. TROUBLE SHOOTING
- 168 -
Copyright © 2012 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
4.23 Charger Troubleshooting
a. Current flow
- LGE960 Charging scenario is stated from bottom side micro USB connector of LGE960. The charging current flows step
by step, USB connector on FPCB to over voltage protection IC (protect up to 28V, PM8921 internal support) to charging
IC(PM8921 internal charger).
b. Charging current setting
- The charging current is set to max 900mA. The constant current period is set until voltage up to 4.3V. The constant
voltage period is ended up to cut-off current of 100mA.
FL10001
INNOCHIPS
EAM62451101
ICMEF112P350MFR
5
6
3
1
4
2
P2
P4
P1
P3
P6
P5
C10003
1u
ZD10007
ENBY0040301
GB042-34S-H10-E3000
CN10001
LS-MTRON
18
17
19
16
20
15
21
14
22
13
23
12
24
11
25
10
26
9
27
8
28
7
29
6
30
5
31
4
32
3
33
2
34
1
C10004
33p
ZD10003
ZD10008
VBUS_USB_IN
0
R10008
L10001
82n
L10003
82n
47K
R10002
ZD10002
ZD10001
D1001
2
MOTOR_VDN
VADAPTER
MOTOR_VDP
USB_DP
USB_DN
KEY_G_LED_DRV_N
Rev.E
Rev.E
Rev.B
Using PM Internal OVP 28V(USB_IN)
2mm
QCT's Recommend
C23019
100n
4.7u
C23021
C23020
100n
J1
8
P1
8
N18
N17
P1
7
D17
D18
M1
8
M1
7
D1
G1
7
F1
8
F1
7
E1
8
E1
7
USB_IN
1
USB_IN
2
USB_OUT1 USB_OUT2 PHY_VBU
S
USB_ID
DC_IN
1
DC_IN
2
OVP_SN
S
OVP_CT
L
VDRV_
N
VDRV_
P
VSW_CHG_01 VSW_CHG_02
VREG_CHG
USB_PHY_VBU
S
VBUS_USB_IN
L23001
1u
C23012
DNI
+VPW
R
C23016
1u
C23013
10u
Rev.D
Rev.D
1.5mm
Rev.B
Battery
System