LG -P768 Service Manual page 62

revA(1.8nH) -> revB(1nH)
TP1
1n
VDD_2V85
C144
10n
C136 1.8n
GSM_LB_TX
TXL VSPI
8 16
TXH VDD
6 17
FL101
GND5 TRX_6
10 18
L104 L105 GND4 TRX_5
RF6361A
9 19
DNI DNI
GND3 TRX_4
7 20
revA(2.7nH) -> revB(1.8nH)
C139 1.8n
GSM_HB_TX
L109
L108
DNI
0.75p
B5/GSM850
B8/EGSM
LGE Internal Use Only
revA(1nH) -> revB(1.2nH)
SW102
MS-156C
2 L128 1.2n
COMMON ANT
C120
1
G4 G3
L135
ENWY0008701 4 3 L129
L101
DNI
DNI
150n
GSM1800_RX
2.7n
C132 33p C133
L102
DNI
B1
C135 1.8n
C134 33p
C143 revA(1.5nH) -> revB(1.8nH)
100p L103
DNI
B2/GSM1900
C137 1.5n
C138 100p
revA(2.2n) -> revB(100p)
revA(7p) -> revB(1.5nH)
L106
DNI
TP2
revA(6.8nH) -> revB(3.3nH)
C145
220p C146 3.3n
L112
DNI
C151
C150 220p 3.9n
L115
DNI
Schematic of GSM850/EGSM/DCS/PCS Rx Block
Set the phone Rx is On
Check TP1 Signal exist?
Yes
Check TP2 Signal exist?
Yes
Check Duplexer, PMB5712
SW101
UFL-R-SMT10
G1
ANT G2
ENWY0003901
GND
18
Rx_GSM1800_1
RX_GSM1800_M1X
19
Rx_GSM1800_2
RX_GSM1800_M1
48
ANT_GSM1800
12 14
ANT_Band1 Rx_Band1_1 RX_B1_H2X
50 15
ANT_Band2 Rx_Band1_2 RX_B1_H2
46
ANT_Band5
44 16
ANT_Band8 Rx_Band2_1 RX_B2_M2X
17
U102 Rx_Band2_2 RX_B2_M2
B40251GY2045L 20
Rx_Band5_1 RX_B5_L2X
2 EAM62530601 21
GND1 Rx_Band5_2 RX_B5_L2
4
GND2
5 22
GND3 Rx_Band8_1 RX_B8_L1X
6 23
GND4 Rx_Band8_2 RX_B8_L1
8
GND5
10 34
GND6 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)
GSM_LB_TX
C152 1n
GSM_HB_TX
0.5p
L116
revA(1pF) -> revB(0.5pF)
2.7n
C147
0.5p
L113
revA(0.75pF) -> revB(0.5pF)
No
Check RF Switch (M/S)
No
Check Separator
- 62 - Copyright © 2012 LG Electronics. Inc. All right reserved.
4. TROUBLE SHOOTING
B8_TX RF_GND
1 21
B5_TX NC
2 13
VBAT_PAM
B3_TX LB_RFIN
7 15
U103
B2_TX HB_RFIN
4 8
RF6261B
B1_TX EAN62491801 VCC
5 16
GSM_LB_TX SDI_EN SPI_SS
3 9
GSM_HB_TX SDI_CLK SPI_CLK
6 11
SDI_DAT SPI_DRW
10
GND
C141 C142
100n 0.1u
CP_OUT
Only for training and service purposes
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)