LG -T300 Service Manual page 72

CIRCUIT
RF SUPPLIES (CLEAN GND)
VDDTRX VDDRF2
PIN_B14 PIN_G13
. .
C129 C136 C135
1u 18p 220n
1V8_VDD
L101 3.3u
C111
22u
VBAT
C138 10u
N12
LCD_ID
M0
T11
BAT_TEMP
M1
R11
M2
N11
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
.
C127
C122
4.7n
470n
(10V)
PMU SUPPLIES
VBAT_PMU
VBAT VPMU VAUX
PIN N8 PIN P10 PIN P8
C106 C117 C125
2.2u 0.1u 1u
. . .
(10V)
TX_RAMP
1V8_VDD
VBAT
1V8_VDD 1V8_VDD VPMU VCORE 1V8_VDD 1V8_VDD
Figure 4.2 Power block of LG-T300
Figure 4.2 power block of T300
4. TROUBLE SHOOTING
VDDTDC VDDMS VRF1
PIN_B12 PIN_H13 PIN_H10
Seperate and shield .
. .
C126 C124 C118
47n 47n 1u
ABB SUPPLIES
VDD1V8CP
VMMC VUSB VCORE
1V8_VDD
PIN L7 PIN M9 PIN K8
PIN P14
C133
C121 C115 C134
0.1u
470n 0.1u 220n
.
VDDMS VDDXO VDDTDC VBAT_RF2 VAUX VMMC VUSB VDDRF2
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4. TROUBLE SHOOTING
DBB SUPPLIES
1V8_VDD
VDD_IO1 VDD_IO2 VDD_EBU
1V8_VDD 1V8_VDD
R110
0
PIN G9 PIN K7
C132 C110
1u 0.1u
VBATSP
Speaker Supply
VBAT
PIN P16
C119
2.2u
(10V)
R114
470
R117
3.9K
3 Q101
2
R115
VRF1 VRTC VBAT
1
100K
R118
5.6K
K3
A_D0
K2
A_D1
LGE Internal Use Only
1V8_VDD
PIN R5
C128
0.1u
LDO_OUT
(1%)
AD00
AD01