Power On Trouble - LG 410G Service Manual

4.5 Power On Trouble

TEST POINT
Check Points
-Battery Voltage( Need to over 3.35V)
-Power-On Key detection (PWRON signal)
-Outputs of LDOs from ABB(Triton-Lite)
POWER_ON
CIRCUIT
R213
RPWON
TP1
Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
END
KB200
150
VA202
EVLC14S02050
V_EXTH V_SIM V_RTC V_ABB
V_EXTL V_MMC V_USB V_IO V_MEM
C154 C155 C156 C157 C158 C159 C160 C161
0.1u 1u 1u 470n 1u 1u 1u 1u
-41-
V_SIM
V_MEM
TP1
R213
K17
VCC4_2
H16
VCC5_1
H17
VCC5_2
F10
VCC6
C125 C126
1000p 10u
V_PLL
C162 C163
1u 2.2u
- 45 -
4. TROUBLE SHOOTING
V_ABB
V_SIM
U300
X100
T1
TCK
K12
TESTRESET
B17
TESTV
M10
SIMDTC
R123 R124
DNI DNI
VBAT
R126
3.3
C136
1u
L103
2.2uH
D100
VRWLED
SDB0530
C143
2.2u
LGE Internal Use Only