LG KG270 Service Manual - Page 76
Charging Trouble
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4. TROUBLE SHOOTING 4.14 Charging Trouble TEST POINT Check Points -Connection of TA (check TA voltage 5.2V) -Charging Current Path component voltage drop -Battery voltage -Charging IC R124 Charger IC U101 C125 VBAT VCHARGE =5.2V C126 CN301 CIRCUIT CHARGING IC 2V8_VIO VCHARGE VBAT VCHARGE R118 NA U101 CHARGE_DETECT R119 1.8K 1 VIN 10 VBAT C125 R120 2 9 _FAULT VSEN_TEMP 1u NA CHG_STATUS R121 3 _STATUS IREF 8 (10V,K,X5R) R122 0 (10V,K,X5R) NA C126 4 TIME V2P8 7 1u C127 0.015u 5 11 GND PGND 6 EN C128 R124 R123 NA R125 ISL9201IRZ-T 1u 160K 100K (1%) CHG_EN_TEST CHG_EN - 77 -
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4. TROUBLE SHOOTING
- 77 -
4.14 Charging Trouble
Check Points
-Connection of TA (check TA voltage 5.2V)
-Charging Current Path component voltage
drop
-Battery voltage
-Charging IC
TEST POINT
CIRCUIT
(10V,K,X5R)
CHARGING IC
(1%)
(10V,K,X5R)
1u
C126
2V8_VIO
VCHARGE
NA
R120
NA
R118
1.8K
R119
0.015u
C127
160K
R124
VBAT
1u
C125
NA
R123
R125
100K
R121
NA
2
_FAULT
_STATUS
3
6
EN
GND
5
8
IREF
11
PGND
TIME
4
7
V2P8
10
VBAT
VIN
1
VSEN_TEMP
9
U101
ISL9201IRZ-T
0
R122
C128
1u
VCHARGE
CHG_EN_TEST
CHG_STATUS
CHG_EN
CHARGE_DETECT
Charger
IC
U101
C125
C126
R124
CN301
VCHARGE
=5.2V
VBAT