LG -P768 Service Manual page 53

TP1
C136 1.8n
GSM_LB_TX
TXL
8
TXH
6
FL101
GND5
10
L104 L105 GND4
RF6361A
9
DNI DNI
GND3
7
revA(2.7nH) -> revB(1.8nH)
C139 1.8n
GSM_HB_TX
L109
L108
DNI
0.75p
GSM_LB_TX
GSM_HB_TX
LGE Internal Use Only
revA(1.8nH) -> revB(1nH)
2
COMMON
1n C120
ENWY0008701
L101
150n
GSM1800_RX
C132
VDD_2V85
B1
C134
C144 C143
10n 100p
L103
VSPI
16
B2/GSM1900
VDD
17
TRX_6
18
TRX_5
19 C137 1.5n
TRX_4
20
revA(7p) -> revB(1.5nH)
B5/GSM850
C145
220p
B8/EGSM
C150 220p
B8_TX
1
B5_TX
2
B3_TX
7
U103
B2_TX
4
RF6261B
B1_TX EAN62491801
5
GSM_LB_TX
3
GSM_HB_TX
6
C141
100n
CP_OUT
Schematic of WCDMA Band1, 8 Tx Block
SW101
UFL-R-SMT10
revA(1nH) -> revB(1.2nH)
SW102
MS-156C
L128 1.2n
ANT ANT
1
G4 G3 ENWY0003901
L135
4 3 L129
DNI
DNI
TP2
2.7n
C133
33p
L102
DNI
48
ANT_GSM1800
12
33p C135 1.8n
ANT_Band1
50
ANT_Band2
46
revA(1.5nH) -> revB(1.8nH) ANT_Band5
44
ANT_Band8
DNI
2
GND1
4
GND2
5
GND3
6
GND4
8
GND5
10
C138 100p
GND6
revA(2.2n) -> revB(100p)
L106
DNI
revA(6.8nH) -> revB(3.3nH)
C146 3.3n
L112
DNI
TP3
C151
3.9n
L115
DNI
RF_GND
21
NC
13
VBAT_PAM
LB_RFIN
15
HB_RFIN
8
VCC
16
SDI_EN SPI_SS
9
SDI_CLK SPI_CLK
11
SDI_DAT SPI_DRW
10
GND
C142
0.1u
- 53 - Copyright © 2012 LG Electronics. Inc. All right reserved.
4. TROUBLE SHOOTING
G1
G2
GND
18
Rx_GSM1800_1
19
Rx_GSM1800_2
14
Rx_Band1_1
15
Rx_Band1_2
16
Rx_Band2_1
17
U102 Rx_Band2_2
B40251GY2045L 20
Rx_Band5_1
EAM62530601 21
Rx_Band5_2
22
Rx_Band8_1
23
Rx_Band8_2
34
GND19
35
GND20
36
GND21
revA(5.6nH) -> revB(4.7nH)
C163 4.7n
0.75p
L125
revA(1.5pF) -> revB(0.75pF)
C159 2.2n
revA(DNI) -> revB(2.2nH)
L120
DNI
revA(2.7nH) -> revB(1nH)
C152 1n
0.5p
L116
revA(1pF) -> revB(0.5pF)
2.7n
C147
0.5p
L113
revA(0.75pF) -> revB(0.5pF)
C153 33p
TX_L
C154
L117
DNI DNI
revB(6.8nH)->revC(4.7nH)
C148 4.7n
TX_H
8.2n
L114
C149 DNI
revB(6.9nH)->revC(8.2nH)
Only for training and service purposes
RX_GSM1800_M1X
RX_GSM1800_M1
RX_B1_H2X
RX_B1_H2
RX_B2_M2X
RX_B2_M2
RX_B5_L2X
RX_B5_L2
RX_B8_L1X
RX_B8_L1
GSM_LB_TX
GSM_HB_TX
TP4