Power On Trouble - LG KG270 Service Manual

4. TROUBLE SHOOTING

4.3 Power On Trouble

TEST POINT
Check Points
-Battery Voltage( Need to over 3.35V)
-Power-On Key detection (PWRON signal)
-Outputs of LDOs from EGV
LDO VOLTAGE
V_BUF 3.2V
V_MEM 2.8V
V_IO 2.8V
V_SIM 2.85V
VRF0 1.5V
V_ANA 2.5V
CIRCUIT
3V2_VBUF
(1608)
L102
18nH
PART
C101
C109
C106
C107
C108
C110
C113
2V0_VRTC
C113
1u
- 54 -
C111
C110
EGV
26Mhz
R100
6.8K
BAT100
D12
REXT
A9
XOX
A8
XO
C107
C101
C109
IC
VRF1
C111
1u
VBAT
C115
(1608)
2.2u
(16V,K,X5R)