Only For Training And Service Purposes - LG TU550 Service Manual

4.6.2 Checking Ant. SW Module
Refer to chapter 4.4
4.6.3 Checking RF Tx level
ANT100
C1910 27p
TP1
WCDMA_800
WCDMA_1900
ANTENNA SWITCH MODULE LOGIC
GSM/EDGE
Copyright © 2007 LG Electronics. Inc. All right reserved.

Only for training and service purposes

TP3
C1000 56p
4p
G2
ANT RF
G1
C1001
56nH
L103 L104
0.75p KMS-507
L105
NA L1001 NA
SW100
6.8nH
C1014 100p
C1019
33p
L117
NA
L116
NA
TP2
IN_A IN_B IN_C
GSM900/GSM850 TX HIGH HIGH LOW
DCS/PCS TX HIGH LOW LOW
GSM 850 RX LOW HIGH LOW
UMTS 850 HIGH LOW HIGH
DCS RX LOW HIGH HIGH
PCS RX LOW LOW HIGH
UMTS 1900 HIGH HIGH HIGH
LOW LOW
GSM900 RX LOW
Schematic of RF TX Level
4. TROUBLE SHOOTING
TP1
TP2
R1001
R1002 1K
C1007 C1008
33p 33p
23 1
ANT GND1
22 2
GND6 RX4
21 3
TRX1 RX3
20 4
GND5 RX2
19 5
TRX2 U100 RX1
18 6
GND4 CXG1198AEQ GND2
17 7
NC8 NC1
16 8
NC7 NC2
15 9
NC6 NC3
14 10
NC5 NC4
C1023
33p
C1046
C1511
100p
33p
C1828
0.5p
0.5p
C1827
L172
L402
4.7nH
6.8nH
16
DCS_PCS_OUT
10
GSM_OUT AND0041
- 87 -
15
R1000 1K
1K
C1009 C1010 C1011
33p 0.1uF 33p
5 4
G2 O2
IN
1
G1 O1
2 3
B7837
FL102
L121
NA
R1008
(1%)
2.2K
C1038
TP3
68p
C1056
51p
1
DCS_PCS_IN
7
U102 GSM_IN
3
TX_EN
2
BS
LGE Internal Use Only