LG KG271 - 4.3 Power On Trouble

4. TROUBLE SHOOTING
- 54 -
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
TEST POINT
CIRCUIT
(1608)
(1608)
(16V,K,X5R)
R101 22K
2V85_VSIM
C115
2.2u
VD1
BAT100
1V5_VRF0
C114
6.8K
R100
220n
3V2_VBUF
1u 1u
C110
C108
VBAT
2V85_VSIM
VRF1
W_LED_FBN
J12
W_LED_FBP
J14
XO
A8
A9
XOX
R6 R7
VDD_SIM
G15
VREFP
VSS1
B8
VSS2
B9
VDDP_MEM
VDD_LANA
K15
VDD_LBUF
J13 G12
VDD_LD1
VDD_LIO
J10 K10
VDD_LMEM
B11
VDD_LRF1V5 VDD_LRF2V5
F15
VDD_LRTC
K12
VDD_LSIM
M11
VDD_MAIN1
G9
VDD_MAIN2
J7 G10
VDD_PLL
VDD_RTC
H13
VBAT_1 VBAT_2
F12 H15
VBAT_3 VBAT_4
H14 F6
VDDP_IO
L4
D12
REXT
IREF
G13
AGND
G14
2V8_VIO
C112 1u
C106
1u
2V0_VRTC
2V8_VIO
1u
C113
2V8_VMEM
C111
1u
2V0_VRTC
1uC109
2V5_VANA
2V8_VMEM
2.2u
18nH
L102
C101
1uC107
VD1
LDO VOLTAGE PART
V_IO 2.8V C107
V_BUF 3.2V C101
V_MEM 2.8V C109
V_ANA 2.5V C113
V_SIM 2.85V C108
VRF0 1.5V C110
C106
C107
C111
C110
C109
C101
EGV
IC
26Mhz