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3.11 Charger
4. 11. Charger
D620 uses PMIC (Power Management IC) for charging control. The PMIC (PM8926) circuit includes the charging pass transistor
detects the VDD and VBAT voltages, and its control driver.
Charging Procedure
- Supply the VCHG use a TA or u-USB cable
- PM8926 control the charging current
- Charging current flows into the main battery & system current
Troubleshooting Check Point
- Connection of the TA or u-USB cable
- Charging current path
- Main battery
During charging operation, Internal detector circuits measure these voltages to recognize when an external supply. And then, SW-
controlled charging start.
+5V0_VREG_BHARGER
+5V0_VREG_BHARGER
+2V1_VSW_S4
LGE Internal Use Only
+VPWR
CHG_PGND
VBAT
C4145
VBAT_SENSE
VBAT_SENSE_P
C4146
470n
+VPWR
R4135
+VPWR
Note 2
R4138
+VPWR
VCOIN
VBAT_SENSE_N
R4139
+2V075_VREG_L25
0
Note 3
If you don't use bypass Boost, Connect +VPWR
+VPWR
+VPWR
Current Sensing Point for WLED Driver
Note 9
4. Trouble
Shooting
Test Point :
1. VCHG ( if TA or u-USB connected, +5.0V)
2. C4142 , C4143
0.1u
DNI
DNI
+1V35_VSW_S3
+2V1_VSW_S4
+2V1_VSW_S4
+VPWR
+VPWR
Note 4
GR1 : L1, L2, L4, L5
GR2 : L3, L24, L26
GR3 : L6, L7, L8, L9, L27
GR4 : L10, L11, L13
GR5 : L14, L12
GR6 : L15, L16, L17, L18
GR7 : L19, L20, L21, L22, L23, L28
R4141
0
Place input caps close to respective VIN pins.
Note 5
Each capacitor GND should be star routed to their respective reference ground
(GND_S1, GND_S2, GND_S3, GND_S4)
Then input caps should via directly to main ground
98
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Copyright © 2014 LG Electronics. Inc. All right reserved.
3. TROUBLE SHOOTING
143
VCHG_1
155
VCHG_2
154
L4133
1u
VSW_CHG_1
166
L4133 Part Change
VSW_CHG_2
152
VPH_PWR_1
164
VPH_PWR_2
140
BATFET_CP_DRV
139
VBAT_1
151
VBAT_2
163
VBAT_3
156
VBAT_SNS
131
BMS_BYP
107
BMS_CSP
96
BMS_CSN
76
VCOIN
Note 1
104
VDD_FLASH
4
VDD_GR1
1
VDD_GR2_1
11
VDD_GR2_2
115
VDD_GR3
27
VDD_GR4
59
VDD_GR5_1
60
VDD_GR5_2
7
VDD_GR6
41
VDD_GR7
48
VDD_L25
121
AVDD_BYP
170
VPRE_BYP
9
VDD_S1_1
10
VDD_S1_2
22
GND_S1_1
33
GND_S1_2
34
VDD_S2
57
GND_S2_1
67
GND_S2_2
68
GND_S2_3
47
VDD_S3
23
GND_S3
93
VDD_S4
69
GND_S4
126
VDD_WLED
113
GND_WLEDI_1
114
GND_WLEDI_2
79
VDD_S5
92
GND_S5
Only for training and service purposes
U4100
PM8926
CHG_PGND
98
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