LG -C300 Service Manual page 72

CIRCUIT
RF SUPPLIES (CLEAN GND)
VDDTRX VDDRF2
PIN_B14 PIN_G13
C125 C132 C131
1u 18p 220n
1V8_VDD
3.3u
22u
C107
VBAT
C134 10u
N12
LCD_ID
M0
T11
BAT_TEMP M1
R11
M2
C119 4.7n N11
VDD_FMR
M10
FM_ANT
FMRIN
M11
FMRINX
C133 DNI T15
R111 CP1
R15
CP2
0
A15
GSM_OUT TX1
A14
BS2
FE2
Copyright © 2010 LG Electronics. Inc. All right reserved.
Only for training and service purposes
RF SUPPLIES (DIRTY GND)
VBAT
VBAT_RF2 VDDXO
PIN_G14 PIN_E11
FB101
75
C123
C147
C118
4.7n
470n
5p
(10V)
PMU SUPPLIES
VBAT_PMU
VBAT VPMU VAUX VMMC
PIN N8 PIN P10 PIN P8
C101 C113 C121
2.2u 0.1u 470n
(10V)
TX_RAMP
1V8_VDD
VBAT
1V8_VDD 1V8_VDD VPMU VCORE 1V8_VDD 1V8_VDD
ABB
RF
Figure 4.2 Power block of LG-C300
Figure 4.2 power block of LG-C300
4. TROUBLE SHOOTING
1V8_VDD
VDDTDC VDDMS VRF1
PIN_B12 PIN_H13 PIN_H10
Seperate and shield
C122 C120 C114
47n 47n 1u
ABB SUPPLIES
VDD1V8CP
VUSB VCORE
1V8_VDD
PIN L7 PIN M9 PIN K8
PIN P14
C117 C111 C130
470n 0.1u 220n
C129
0.1u
VDDMS VDDXO VDDTDC VBAT_RF2 VAUX VMMC VUSB VDDRF2 VRF1
RF SUPPLY DOMAIN
- 7 -
4. TROUBLE SHOOTING
DBB SUPPLIES
VDD_IO1 VDD_IO2 VDD_EBU
1V8_VDD 1V8_VDD 1V8_VDD
R103
0
PIN G9 PIN K7 PIN R5
C128 C106 C124
0.1u 0.1u 0.1u
VBATSP
Speaker Supply
VBAT
PIN P16
C115
2.2u
(10V)
R106
470
R109
3.9K
3
Q101 2
R107
VRTC VBAT
1
100K
(1%)
R110
5.6K
K3
A_D0
K2
A_D1
L1
A_D2
M1
A_D3
N3
A_D4
M2
A_D5
N1
A_D6
P2
A_D7
PMU PADS
K1
A_D8
L4
A_D9
LGE Internal Use Only
LDO_OUT
AD00
AD01
AD02
AD03
AD04
AD05
AD06
AD07
AD08
AD09