LG KP175 - Power on Trouble

4.4 Power On Trouble
- 52 -
4. TROUBLE SHOOTING
LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
2V8_VEXT
2V8_VMEM
1V8_VCORE
2V5_VMIC
2V75_VVCXO
2V85_VSIM
TEST POINT
1u
C127
1V8_VCORE
1u
C131
1u
C129
1u
C128
C124
2V5_VMIC
C123
1u
2V8_VMEM
2.2u
VGP
VUSB
1u
C126
T19
VUSB_REG
1V8_VRTC
VMEMFB
W13
U12
VMEMSEL
VMEM_REG
V12
VMIC
U19
VRF
M19
W15
VRTC
T11
VRTCSEL
V14
VSIM_REG
VEXT_REG1
V11
VEXT_REG2
W11
VGP
W14
V8
VCOREFB
W8
VCOREOUT
VABB
N18
J9
NC22
NC23
P18
NC24
N19
NC25
V17
L14
NC26
T13
2V75_VVCXO
0.1u
C132
2V8_VEXT
C130
1u
C125
1u
2V85_VSIM
CIRCUIT
Figure 4.4
PWR
END
R400
680
POWERKEY
H9
VCXOEN
PWRON
V5
K9
RESET2P8
RXON
W7
NRESET
J8
J9
NC22
MCLK
V7
MCLKEN
T10
T8
INT
K10
GPO_0
GPO_29
J10
GPIO_48
DBBON
V6
H8
CLKON
U7
CLKOUT
CLKOUT_GATE
R10
U8
ABBRESET
INT
3
1
2
D100
KDS121E
100K
R109
100K
R107
R112 3300
D101 KDS114E
RPWRON
_RESET
VCXOEN
VCXOENBT_DBB_CLKON