Power On Trouble - LG KF510C Service Manual

5. Trouble shooting

5.2 Power on Trouble

Check Points
- Battery Voltage( Need to over 3.35V)
- Power-On Key detection (PWRON signal)
- Outputs of LDOs from PMIC
Bat t er y V olt ag e Check Poin t
TP2
Remote Power On
RPWRON_EN
EXTERNAL RESET
EXTRSTn
SPOWER_INT
_RESET
LGE Internal Use Only
U204
TP1
R222
3.3M
R223
3.3M
C253
2.2u
END_KEY_IN
2V62_VIO 2V11_RTC
7 8
A1 VCC
6 1
B1 Y1
5 2
Y2 B2
4 3
GND A2
C263
0.1u
U204
TP2
NC7WZ08L8X
2V11_RTC
If Power On Key is pressed,
TP1 is low
R219
100K
PWRON
To Boot the phone, TP2 signal is high
PM_INT
PMRSTn
Copyright © 2008 LG Electronics. Inc. All right reserved.
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TP1
Q201
Only for training and service purposes