Checking Rf Tx Level - LG KU950 Service Manual

4. TROUBLE SHOOTING
4.6.2 Checking Ant. SW Module
Refer to chapter 3.4

4.6.3 Checking RF Tx level

TP1
VREG_RFRX_1_2.85V
TP3
TP2
Test Point (RF Tx Level)
ANT100 OUT100 ANT101
R101
NA
L101 KMS-507
SW100
C102
R199
G2
ANT RF
G1
2.7nH
0
1p
L102 L103
C101
NA 100nH
ANT_SEL0
ANT_SEL1
ANT_SEL2
C105 C106 C107
33p 33p 33p
L111 10nH
C109
0.01u
Schematic of RF Tx Level
33p
FL100
LMSP54MA-543
19
GSM900_RX1
14 20
VC1 GSM900_RX2
15
VC2
16 21
VC3 GSM1800_RX1
22
GSM1800_RX2
13
VDD
23
GSM1900_RX1
1 24
GND1 GSM1900_RX2
2
GND2
4 3
GND3 GSM1800_1900TX
5 6
GND4 GSM900TX
8 7
GND5 UMTS2
10 9
GND6 UMTS1
12
GND7
17 25
GND8 PIN_DIREC1
18 26
GND9 PIN_DIREC2
Near to G-PAM
+VPWR
C117 C121 C122
33u 0.01u 0.01u
2012
R113
15
DCS_PCS_OUT
33p
11
GSM_OUT
C135
5.6nH
19
RSVD_GND
R121
33p
C148
18nH
- 100 -
C123
0.01u
3
DCS_PCS_IN
4
U101 GSM_IN
SKY77328
18
ENABLE
1
BS