LG KB770 Service Manual page 87

4. TROUBLE SHOOTING
4.6.1 Checking Tx level
SW100
G2 ANT
G1
UFL-R-SMT10
4
PGND
3
WCDMA_2100
ANT
TP2
LGE Internal Use Only
R100 0
C101
C104
DNI
DNI
C146
FL102 R122
ACMD-7602
1
6.8nH
RX
2 3.3p
TX
C151
2.7nH
C153
15p
LDC151G9520Q-359
TP3 U103
R124 51
[Fig 4.6.1.2] Schematic of the WCDMA TX Block
SW101
TP1
G2
ANT RF
G1
KMS-512
RX_WCDMA_2100
GND1
6
GND2
L120
7
RFOUT
8
0
GND3
9
C155 C156 VCC
10
DNI 1.2p PGND
11
AWT6279R
HDET
- 88 - Copyright © 2008 LG Electronics. Inc. All right reserved.
C100 56p
C102
56nH
FL100
LMSP4LMA-573TEMP
14
+VPWR
C147 C148 C143
1u 10u
100p
TP4
VEN
5
VMODE1
4
VMODE2
3
RFIN
2
VBATT
C154
1
100p
L122
U102
NA
PA_ON
C159
100p
Only for training and service purposes
FL103
EFCH1950TDF1
4 5
O1 G3
1
IN
G2 G1
3 2
PA_R1
C158
100p