Power On Trouble - LG KF350 Service Manual

4.2 Power on Trouble

Check Points
-Battery Voltage( Need to over 3.35V)
-Power-On Key detection (PWRON signal)
-Outputs of LDOs from PMIC
RPWRON_EN
EXTERNAL RESET
SPOWER_INT
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
R214
3.3M
C249
2.2u
END_KEY_IN
2V62_VIO
7
EXTRSTn A1
6
B1
5
_RESET Y2
4
GND
U203
NC7WZ08L8X
4. TROUBLE SHOOTING
2V11_RTC
R213
100K
TP1
Q201
2SC5663
R216
3.3M
Q203
2SC5663
2V11_RTC
8
VCC TP2
1
Y1
2
B2
3
A2
C255
0.1u
- 65 -
PWRON
PM_INT
PMRSTn
LGE Internal Use Only