LG KP105 - Power on Trouble

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4. TROUBLE SHOOTING
4.3 Power On Trouble
Check Points
-Battery Voltage( Need to over 3.35V)
-Power-On Key detection (PWRON signal)
-Outputs of LDOs from EGV
LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
TEST POINT
CIRCUIT
(1%)
(1608)
(1608)
C112 1u
2V0_VRTC
W_LED_FBP
J14
XO
A8
A9
XOX
C114 1u
W_LED_FBN
J12 G15
VREFP
VSS1
B8
VSS2
B9
VSS4
J8 K8
VSS5 VSS6
K7 F10
VSS8
M8
VSS9
B11
VDD_LRF1V5 VDD_LRF2V5
F15
VDD_LRTC
K12
VDD_LSIM
M11
VDD_MAIN1
G9
VDD_MAIN2
J7 G10
VDD_PLL
VDD_RTC
R6 R7
VDD_SIM
H13
VBAT_1 VBAT_2
F12 H15
VBAT_3 VBAT_4
H14 F6
VDDP_IO
L4
VDDP_MEM
VDD_LANA
K15
VDD_LBUF
J13 G12
VDD_LD1
VDD_LIO
J10 K10
VDD_LMEM
D12
REXT
IREF
G13
AGND
G14
2V8_VIO
2V8_VMEM
1u
C118
C115 1u
GND102
R106
22K
1V5_VRF0
220n
C119
2V85_VSIM
2V85_VSIM
2.2u
C105
2V8_VBUF
2V0_VRTC
VBAT
VD1
FB101
VD1
2V8_VIO
1uC111
2V8_VMEM
C110 1u
1uC113
C107
NA
GND101
2V5_VANA
C117
1u
0R105
VRF1
22u
C116
C120
4.7u
LDO VOLTAGE PART
V_IO 2.8V TP3
V_BUF 2.8V TP1
V_MEM 2.8V TP2
V_ANA 2.5V TP6
V_SIM 2.85V TP4
VRF0 1.5V TP5
U103
X101
U101
TP1
TP2
TP6
TP4
TP5
TP3
TP1
TP3
TP2
TP4 TP5
TP6