Power On Trouble - LG GD310 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
RPWRON_EN
R205
130K
RPWRON
R225
130K
EXTRSTN
SPOWER_INT
_RESET
LGE Internal Use Only
3
R227
2
END_KEY
10K
1
R228
100k
EXTERNAL RESET
2V62_VIO
R207
100K
7
A1
6
B1
5
Y2
4
GND
NC7WZ08L8X
END_KEY_IN
KEY_ROW0
Q201
KTC4075E
KEY_COL2
2V11_RTC
U202
8
VCC
1
Y1
2
B2
3
A2
C248
100n
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2V11_RTC
TP1
R202
2K
3
END_KEY_IN Q200
2
KTC4075E
1
TP2
PM_INT
PMRSTN
Only for training and service purposes
PWRON